C Program to find duplicate characters in a string

In this program, You will learn how to find duplicate characters in a string in c.

---

int main(){
   //statement
}

Example: How to find duplicate characters in a string in c.

#include<stdio.h>
#include<string.h>

int main() {

    int i, j, len, v = 1;
    char str[100];

    printf("Enter string:");
    scanf("%[^\n]%*c", str); 

    len = strlen(str);

    printf("Duplicate characters:");
    for (i = 0; i < len; i++) {
        for (j = i + 1; j < len; j++) {
            if (str[i] == str[j]) {
                if (v == 1 && str[j] != '\0') {
                    printf("%c", str[i]);
                }
                str[j] = '\0';
                v++;
            }
        }
        v = 1;
    }

    return 0;
}

Output:

Enter string:Xiith.com
Duplicate characters:i