One storage space, two possible values

The workshop's old counter sometimes records a number, sometimes a letter. A struct has room for both fields at once; a union makes them share storage. Treat the member you most recently stored as the value to read. The example prints count while that member holds 7, then switches to grade.

#include <stdio.h>

union Entry {
    int count;
    char grade;
};

int main(void) {
    union Entry entry = {.count = 7};
    printf("Count: %d\n", entry.count);
    entry.grade = 'A';
    printf("Grade: %c\n", entry.grade);
    return 0;
}

Find the assignment that switches the stored member from count to grade. After that write, you cannot expect entry.count still to hold seven: the two members occupy overlapping storage.