题目：字符串逆序

循环

#define _CRT_SECURE_NO_WARNINGS #include <stdio.h> int main() { char arr[] = "abcdef"; //int sz = sizeof(arr) / sizeof(arr[0]); int left = 0; //int right = sz - 2; int right = strlen(arr) - 1; while (left<right) { char tem = arr[left]; arr[left] = arr[right]; arr[right] = tem; left++; right--; } printf("%s\n", arr); return 0; }

函数

#define _CRT_SECURE_NO_WARNINGS #include <stdio.h> void reverse(char arr[]) { int left = 0; //int right = sz - 2; int right = strlen(arr) - 1; while (left < right) { char tem = arr[left]; arr[left] = arr[right]; arr[right] = tem; left++; right--; } } int main() { char arr[] = "abcdef"; //int sz = sizeof(arr) / sizeof(arr[0]); reverse(arr); printf("%s\n", arr); return 0; }

递归

#define _CRT_SECURE_NO_WARNINGS #include <stdio.h> void reverse(char* str) { char tem = *str;//1 int len = strlen(str); *str = *(str + len - 1);//2 *(str + len - 1) = '\0';//3 if (strlen(str + 1) >= 2) reverse(str + 1);//4 *(str + len - 1) = tem; } int main() { char arr[] = "abcdef"; //int sz = sizeof(arr) / sizeof(arr[0]); reverse(arr); printf("%s\n", arr); return 0; }