Convert String to Uppercase Dry Run in C

Convert String to Uppercase is an interactive C dry run visualizer from the Strings 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.

Convert String to Uppercase Program Code

#include <stdio.h>
int main() {
    char str[] = "Hello World!";
    int i = 0;
    
    while(str[i] != '\0') {
        if(str[i] >= 'a' && str[i] <= 'z') {
            str[i] = str[i] - 32;
        }
        i++;
    }
    
    printf("Uppercase: %s\n", str);
    return 0;
}

View the complete Strings programs page.