Remove consecutive duplicate characters Dry Run in C

Remove consecutive duplicate characters is an interactive C dry run visualizer from the String Functions programs section. Study the source code, then use the execution controls to follow each step, variable update, highlighted line, and console output.

This page provides a browser-based dry run with source-code highlighting, auto-scroll, voice narration controls, and execution output for learning the program step by step.

Remove consecutive duplicate characters Program Code

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

int main() {
    char str[] = "aabbccddeeff";
    int i, j = 0;
    
    printf("Original: %s\n", str);
    
    for(i = 0; str[i] != '\0'; i++) {
        if(i == 0 || str[i] != str[i - 1]) {
            str[j++] = str[i];
        }
    }
    str[j] = '\0';
    
    printf("After removing consecutive duplicates: %s\n", str);
    return 0;
}

View the complete String Functions programs page.