Closed EstherCho-7 closed 1 month ago
#include <stdio.h> void swap(char* str, int len) { char v; char* fr = str; char* ed = str + len -1; while (fr < ed) { v = *fr; *fr = *ed; *ed = v; fr++; ed--; } } void main() { char str[10] = "ABCDEFGH"; int len = strlen(str); swap(str, len); for (int i = 1; i < len; i+=2) { printf("%c", str[i]); } }