Question

How to check if number include specific digit multiple times in C

Answer 1

#include <stdio.h>
#include <stdbool.h>
 
bool number_include_digit_multiple_times(int n) {
    char buf[32];
    sprintf(buf, "%d", n);
     
    int count[10] = {0};
    for (int i = 0; buf[i] != '\0'; i++) {
        count[buf[i] - '0']++;
    }
     
    for (int i = 0; i < 10; i++) {
        if (count[i] > 1) {
            return true;
        }
    }
     
    return false;
}
 
int main() {
    printf("%d\n", number_include_digit_multiple_times(19827884));
     
    return 0;
}
 
 
 
/*
run:
 
1
 
*/

 

70+ SQL courses for beginners and professionals