Find substring using strstr() Dry Run in C

Find substring using strstr() 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.

Find substring using strstr() Program Code

#include <stdio.h>
#include <string.h>
int main() {
    char str[] = "The quick brown fox jumps over the lazy dog";
    char substr[] = "fox";
    char *ptr;
    
    ptr = strstr(str, substr);
    
    if(ptr != NULL) {
        printf("Substring '%s' found at position: %ld\n", substr, ptr - str);
        printf("Remaining text: %s\n", ptr);
    } else {
        printf("Substring not found\n");
    }
    
    return 0;
}

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