Question

How to check if a string contain only two same repeating characters in C

Answer 1

#include <stdio.h>
#include <string.h>
#include <stdbool.h>
      
bool contain_only_two_same_repeating_chars(char *s) { 
    int len = strlen(s);
    if (len % 2 != 0) return false;
    for (int i = 0; i < len - 2; i++) { 
        if (s[i] != s[i + 2]) { 
            return false; 
        } 
    } 
    return true; 
} 
 
int main() 
{ 
    char s[] = "abababab"; 
   
    if (contain_only_two_same_repeating_chars(s)) 
        puts("Yes");
    else
        puts("No");
   
    return 0; 
} 
 
        
        
        
/*
run:
        
Yes
        
*/

 

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