字串简介

 1 #include <stdio.h>
 2 
 3 void str_print(char str[])
 4 /*
 5  {
 6     int i;
 7     for (i = 0; str[i] != ‘\0‘; i++) {
 8         printf("%c", str[i]);
 9     }
10     printf("\n");
11 } */
12 
13 {
14     printf("%s\n", str);
15 }
16 int main() {
17     char str[] = "Hello world";
18     str_print(str);
19     return 0;
20 }
21 
22 
23 Hello world
24 
25 Process returned 0 (0x0)   execution time : 11.821 s
26 Press any key to continue.

 1 #include <stdio.h>
 2 
 3 int str_len (char str[]) {
 4     int i = 0;
 5     while (str[i] != ‘\0‘) {
 6         i++;
 7     }
 8     return i;
 9 }
10 
11 
12 int main() {
13     char str[11] = "Hello world"; //C 语言允许字元阵列大小刚好只包含有文字内容的部分，但这样的字元阵列不能直接拿来给一般字串处理函式使用
14     printf("Length: %lu\n", sizeof(str));
15     printf("Length: %d\n", str_len(str));// 字串长度
16     return 0;
17 }
18 
19 Length: 11
20 Length: 12
21 
22 Process returned 0 (0x0)   execution time : 1.246 s
23 Press any key to continue.

 1 #include <stdio.h>
 2 
 3 int str_len (char str[]) {
 4     int i = 0;
 5     while (str[i] != ‘\0‘) {
 6         i++;
 7     }
 8     return i;
 9 }
10 
11 
12 int main() {
13     char str[12] = "Hello world"; 
14     printf("Length: %lu\n", sizeof(str));
15     printf("Length: %d\n", str_len(str));// 字串长度
16     return 0;
17 }
18 
19 Length: 12
20 Length: 11
21 
22 Process returned 0 (0x0)   execution time : 1.217 s
23 Press any key to continue.