Find the error I

Question

Please help to find error
https://code.sololearn.com/cP1x6Aj0hHx5/?ref=app

Answer 1

use stack memory.

#include <stdio.h>
union test {
int i;
float f;
char c;
};

int main() {

union test t;
t.f = 10.10f;
printf("%f", t.f);
return 0;
}

Answer 2

Thanks 😘

Answer 3

if you must use heap:

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

union test {
int i;
float f;
char c;
};

int main() {
union test* t = NULL;
t = malloc(sizeof(union test));
t->f = 10.10f;
printf("%f", t->f);
free(t);
return 0;
}