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‎cpp程序设计/12.sort.cpp

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@@ -82,5 +82,11 @@ int main() {
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cout << arr2[i] << " ";
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}
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cout << endl;
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haizei::sort(arr2, 0, 4, [](int a, int b) -> bool {return a < b;});
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for (int i = 0; i < 5; i++) {
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cout << arr2[i] << " ";
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}
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cout << endl;
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return 0;
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}

‎cpp程序设计/a.out

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‎c语言课程/10.11_main.c

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/*************************************************************************
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> File Name: 10.11_main.c
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> Author: Cui Guochong
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> Mail: [email protected]
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> Created Time: 2020年10月11日 星期日 18时39分12秒
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************************************************************************/
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#define ppchar char *
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typedef char * pchar;
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void output(int argc, char *argv[], char **env) {
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printf("argc = %d\n", argc);
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for (int i = 0; i < argc; ++i) {
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printf("%s\n", argv[i]);
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}
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for (int i = 0; env[i]; ++i) {
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if (!strncmp(env[i], "USER=", 5)) {
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if (!strcmp(env[i] + 5, "cgc")) {
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printf("welcome cui\n");
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} else {
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printf("you are not the user! please gun!\n");
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exit(0);
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}
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}
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}
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return ;
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}
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int main(int argc, char *argv[], char **env) {
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pchar p1, p2;
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ppchar p3, p4;//简单的代码替换会出bug
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printf("p1 = %lu, p2 = %lu\n", sizeof(p1), sizeof(p2));
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printf("p3 = %lu, p4 = %lu\n", sizeof(p3), sizeof(p4));
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output(argc, argv, env);
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return 0;
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}

‎c语言课程/10.11_point.c

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/*************************************************************************
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> File Name: 10.11_point.c
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> Author: Cui Guochong
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> Mail: [email protected]
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> Created Time: 2020年10月11日 星期日 15时25分39秒
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************************************************************************/
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#include <stdio.h>
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#define P(a) {\
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printf("%s = %d\n", #a, a);\
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}
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struct Data {
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int x, y;
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};
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int main() {
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struct Data a[2], *p = a;
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a[0].x = 1, a[0].y = 1;
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a[1].x = 2, a[1].y = 2;
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P(a[1].x);
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P((a + 1) -> x);
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P((p + 1) -> x);
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P(p[1].x);
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P((*(p + 1)).x);
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P((*(a + 1)).x);
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P((&a[1])->x);
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P((&p[1])->x);
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P((&a[0] + 1)->x);
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P((*(&a[0] + 1)).x);
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P(*((int *)p + 2));
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return 0;
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}

‎c语言课程/10.11_pointer.c

Lines changed: 32 additions & 0 deletions
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/*************************************************************************
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> File Name: 10.11_pointer.c
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> Author: Cui Guochong
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> Mail: [email protected]
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> Created Time: 2020年10月11日 星期日 16时34分18秒
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************************************************************************/
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//类型作为参数进行传递用宏
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#include <stdio.h>
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/*#define offset(T, a) ({\
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T temp;\
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(char *)&temp.a - (char *)&temp;\
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})**/
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#define offset(T, a) (long)(&(((T*)(NULL))->a))
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struct Data {
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int a;
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double b;
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char c;
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};
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int main() {
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int num = 0x616263;
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printf("%s\n", (char *)(&num));
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int num1 = 0x616263;
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int num2 = 0x61626364;
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//printf("%s\n", (char *)(&num2));
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printf("%s\n", (char *)(&num2 + 1));
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printf("%ld\n", offset(struct Data, a));
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printf("%ld\n", offset(struct Data, b));
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printf("%ld\n", offset(struct Data, c));
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return 0;
32+
}

‎c语言课程/10.9_ip.c

Lines changed: 40 additions & 0 deletions
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/*************************************************************************
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> File Name: 10.9_ip.c
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> Author: Cui Guochong
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> Mail: [email protected]
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> Created Time: 2020年10月09日 星期五 20时55分20秒
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************************************************************************/
7+
//Ip 地址转整数
8+
#include <stdio.h>
9+
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union IP {
11+
struct {
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unsigned char a1;
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unsigned char a2;
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unsigned char a3;
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unsigned char a4;
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} ip;
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unsigned int num;
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};
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int is_little() {
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static int num = 1;
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return ((char *)(&num))[0];
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}
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int main() {
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printf("%d\n", is_little());
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union IP p;
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char str[100];
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int arr[4];
30+
while (~scanf("%s", str)) {
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sscanf(str, "%d.%d.%d.%d", arr + 0, arr + 1, arr + 2, arr + 3);
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p.ip.a1 = arr[3];
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p.ip.a2 = arr[2];
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p.ip.a3 = arr[1];
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p.ip.a4 = arr[0];
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printf("%u\n", p.num);
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}
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//printf("%u\n", p.num);
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return 0;
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}

‎c语言课程/10.9_log.c

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/*************************************************************************
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> File Name: 10.9_log.c
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> Author: Cui Guochong
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> Mail: [email protected]
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> Created Time: 2020年10月09日 星期五 18时15分56秒
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************************************************************************/
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//变参宏, argc相当于...的别名, #将参数字符串化，##连接,确保参数为空的时候不出问题
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//g++ -DEBUG .c 可调用log宏
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#include <stdio.h>
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//#ifdef DEBUG
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#define log(frm, argc...) {\
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printf("[%s : %d] ", __func__, __LINE__);\
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printf(frm, ##argc);\
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printf("\n");\
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}
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//#else
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//#define log(frm, argc...)
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//#endif
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20+
#define contact(a, b) a##b
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22+
void func(int a) {
23+
a += 1;
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log("%d", a);
25+
return;
26+
}
27+
28+
int main() {
29+
int a = 123, abcdef = 0;
30+
//printf("[%s : %d]%d\n", __func__, __LINE__, a);
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func(a);
32+
log("%d %d", a, abcdef);
33+
printf("hello world\n");
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log("hello workd");
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contact(abc, def) = 24;
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log("%d", abcdef);
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return 0;
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}

‎c语言课程/10.9_string_10to16.c

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@@ -0,0 +1,19 @@
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/*************************************************************************
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> File Name: 10.9_string_10to16.c
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> Author: Cui Guochong
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> Mail: [email protected]
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> Created Time: 2020年10月09日 星期五 20时03分55秒
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************************************************************************/
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//使用字符串相关操作方法，计算一个整型16进制表示的位数。
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#include <stdio.h>
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#include <string.h>
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int main() {
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int n;
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char str[12];
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while (~scanf("%d", &n)); {
15+
sprintf(str,"%X", n);
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printf("%s has %lu digits!\n", str, strlen(str));
17+
}
18+
return 0;
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}

‎c语言课程/9.23func.c

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/*************************************************************************
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> File Name: 9.23func.c
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> Author: Cui Guochong
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> Mail: [email protected]
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> Created Time: 2020年09月23日 星期三 20时34分32秒
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************************************************************************/
7+
//函数声明与函数定义
8+
#include <stdio.h>
9+
10+
/*int funcB(int n) {
11+
if (n == 0) return 0;
12+
printf("funcB : %d\n", n);
13+
return 0;
14+
}*/
15+
16+
int funcB(int n);
17+
18+
int funcA(int n) {
19+
if (n==0) return 0;
20+
printf("funcA : %d\n", n);
21+
funcB(n--);
22+
return 0;
23+
}
24+
25+
int main() {
26+
funcA(5);
27+
return 0;
28+
}

‎c语言课程/9.25_my_printf.c

Lines changed: 100 additions & 0 deletions
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/*************************************************************************
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> File Name: 9.25_my_printf.c
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> Author: Cui Guochong
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> Mail: [email protected]
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> Created Time: 2020年09月25日 星期五 18时13分41秒
6+
************************************************************************/
7+
//putchar();向屏幕打印一个字符
8+
#include <stdio.h>
9+
#include <stdarg.h>
10+
#include <inttypes.h>
11+
12+
int reverse_num(int num, int *temp) {
13+
int digit = 0;
14+
do {
15+
*temp = *temp * 10 + num % 10;
16+
num /= 10;
17+
++digit;
18+
} while (num);
19+
return digit;
20+
}
21+
22+
int output_num(int num, int digit) {
23+
int cnt = 0;
24+
while (digit--) {
25+
putchar(num % 10 + '0');
26+
num /= 10;
27+
cnt++;
28+
}
29+
return cnt;
30+
}
31+
32+
int my_printf(const char *frm, ...) {
33+
//字符串字面量不可被修改，所以用const, char *const frm:指针常量
34+
va_list arg;
35+
va_start(arg, frm);
36+
int cnt = 0;
37+
#define PUTC(a) putchar(a), ++cnt//局部宏，工程中很少全局宏
38+
for (int i = 0; frm[i]; ++i) {
39+
switch (frm[i]) {
40+
case '%': {
41+
switch (frm[++i]) {
42+
case '%': {
43+
PUTC(frm[i]);
44+
} break;
45+
case 'd': {
46+
int xx = va_arg(arg, int);//取int类型的值
47+
uint32_t x;
48+
if (xx < 0) x = -xx, PUTC('-');//输出负数
49+
else x = xx;
50+
int num1 = x / 100000, num2 = x % 100000;
51+
int temp1 = 0, temp2 = 0;
52+
int digit1 = reverse_num(num1, &temp1);
53+
int digit2 = reverse_num(num2, &temp2);
54+
if (num1) digit2 = 5;
55+
else digit1 = 0;
56+
cnt += output_num(temp1, digit1);
57+
cnt += output_num(temp2, digit2);
58+
} break;
59+
case 's': {
60+
const char *str = va_arg(arg, const char*);
61+
for (int i = 0; str[i]; i++) {
62+
PUTC(str[i]);
63+
}
64+
} break;
65+
}
66+
} break;
67+
default: PUTC(frm[i]); break;
68+
}
69+
}
70+
#undef PUTC
71+
va_end(arg);
72+
return cnt;
73+
}
74+
75+
int main() {
76+
int a = 123;
77+
printf("hello world\n");
78+
my_printf("hello world\n");
79+
printf("int a = %d\n",a);
80+
my_printf("int a = %d\n",a);
81+
printf("int a = %d\n",1000);
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my_printf("int a = %d\n",1000);
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printf("int a = %d\n",0);
84+
my_printf("int a = %d\n",0);
85+
printf("int a = %d\n",-123);
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my_printf("int a = %d\n",-123);
87+
printf("int a = %d\n",INT32_MAX);
88+
my_printf("int a = %d\n",INT32_MAX);
89+
printf("int a = %d\n",INT32_MIN);
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my_printf("int a = %d\n",INT32_MIN);
91+
char *str = "I love china\n";
92+
printf("%s", str);
93+
my_printf("%s", str);
94+
int n;
95+
while (~scanf("%d", &n)) {
96+
printf(" has %d digits!\n", printf("%d", n));
97+
my_printf(" has %d digits!\n", my_printf("%d", n));
98+
}
99+
return 0;
100+
}

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