Code Bot compiler - 在线编译器 C. This code reads two strings and tries to find the first position where they differ. It prints -1 if the strings are identical, otherwise it prints the index of the first differing character. - The condition in the while loop is incorrect. The loop shou...

在线编译器 C

#include <stdio.h> int main() { char s1[1001], s2[1001]; scanf("%s",s1); scanf("%s",s2); int i = 0; while (s1[i] == '\0' && s2[i] != '\0'&&s1[i]==s2[i]) { i++; } if (s1[i] == '\0' && s2[i] == '\0') { printf("-1\n"); } else { printf("%d\n", i); } return 0; }

This code reads two strings and tries to find the first position where they differ. It prints -1 if the strings are identical, otherwise it prints the index of the first differing character.

- The condition in the while loop is incorrect. The loop should continue while the characters are equal and neither string has ended, but your condition checks `s1[i] == '\0'` which is true only when the string has ended, so the loop never runs for non-empty strings. Think about what condition should be true for the loop to continue, not to stop.

- The logic for checking if both strings ended uses `s1[i] == '\0' && s2[i] == '\0'`, but after the loop, `i` already points to the first mismatch or the end of one string. Consider what `s1[i]` and `s2[i]` represent after the loop ends correctly.