Created
January 22, 2017 08:57
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| #include <stdio.h> | |
| #include <string.h> | |
| void swap(char* a, char* b) | |
| { | |
| *a ^= *b; | |
| *b ^= *a; | |
| *a ^= *b; | |
| } | |
| void reverse_imp(char* ch, int offset) { | |
| if (offset < 2) return; | |
| swap(ch, ch+offset); | |
| reverse_imp(ch+1, offset-2); | |
| } | |
| char* reverse(char* str) | |
| { | |
| //printf("%s, len=%lu\n", str, strlen(str)); | |
| reverse_imp(str, strlen(str)-1); | |
| //printf("%s, len=%lu\n", str, strlen(str)); | |
| return str; | |
| } | |
| int main() | |
| { | |
| char str1[] = "abcdefg"; | |
| char str2[] = "abcdefgh"; | |
| printf("%s\n", str1); | |
| reverse(str1); | |
| printf("%s\n\n", str1); | |
| printf("%s\n", str2); | |
| reverse(str2); | |
| printf("%s\n", str2); | |
| return 0; | |
| } |
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