C Program to Get a Non-Repeating Character From the Given String - Source Code, Output & Execution Flow

C Program to Get a Non-Repeating Character From the Given String

This tutorial explains c program to get a non-repeating character from the given string with C source code, sample output, and step-by-step execution flow.

#include <stdio.h>
#include <string.h>
int main() {
    char str[] = "swiss";
    int count[256] = {0}, i;
    for (i = 0; str[i]; i++) count[(unsigned char)str[i]]++;
    for (i = 0; str[i]; i++) {
        if (count[(unsigned char)str[i]] == 1) { printf("First non-repeating character: %c
", str[i]); break; }
    }
    return 0;
}

First non-repeating character: w

Practice This Program

In this program, the input is read first when required, the core logic is applied step by step, and the final result is displayed using printf(). Follow the execution flow beside the code to understand how each statement contributes to the output.