Online C compiler: run C in your browser and watch memory step by step

#include <stdio.h>

int main(void) {
    printf("Hello, world!\n");
    printf("Learn to code\n");
    printf("by playing.\n");
    for (int n = 1; n <= 3; n++) {
        printf("Level %d", n);
        printf(" unlocked!\n");
    }
    return 0;
}