Question

How to determine if a string has all unique characters in C

Answer 1

#include <stdio.h>
#include <string.h>
#include <stdbool.h>
  
int count_unique_char(char* p) {
    int ascii[256] = { 0 };
    int size = strlen(p);
   
    for (int i = 0; i < size; i++) {
        ascii[p[i]] += 1;
        if (ascii[p[i]] > 1)
            return false;
    }
   
    return true;
}
   
int main() {
    char str[64] = "node.js c";
   
    printf("%s", (count_unique_char(str)) ? "yes" : "no");
       
    return 0;
}
   
   
   
   
   
/*
run:
   
yes
   
*/

 

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