Floating Point Issues - General Questions

How many significant decimal digits does a float typically hold?

What will be the output of the program?

#include <stdio.h>

int main(void) {
    printf("%zu %zu\n", sizeof(float), sizeof(double));
    return 0;
}

What will be the output of the program?

#include <stdio.h>

int main(void) {
    float f = 5 / 2;
    printf("%.2f\n", f);
    return 0;
}

What will be the output of the program?

#include <stdio.h>

int main(void) {
    printf("%g\n", 0.0001);
    return 0;
}

What will be the output of the program?

#include <stdio.h>

int main(void) {
    int i = 7;
    printf("%.1f\n", i / 2.0f);
    return 0;
}