When to use a for loop and when to use a while loop

main.c

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

int main(int argc, char* argv[]) {
    char text[] = "Hello world!";
    
    int i;
    for (i = 0; i < strlen(text); i++) {
        printf("%c ", text[i]);
    }
    printf("\n");
    
    i = 0;
    while (text[i] != ' ') {
        printf("%c ", text[i]);
        i++;
    }
    return 0;
}