union.c

#include <stdio.h>

union Data {
    int integer;
    float real;
    char character;
};

int main() {
    union Data data;

    data.integer = 42;
    printf("Integer: %d\n", data.integer);

    data.real = 3.14;
    printf("Real: %f\n", data.real);

    data.character = 'A';
    printf("Character: %c\n", data.character);

    return 0;
}