Sizeof

sizeof reports how many bytes a type or value uses on the current platform.

sizeof_types.c

#include <stdio.h>

int main(void) {
    int count = ;
    int bytes = (int)(count * sizeof(int));

    printf("int=%zu\n", sizeof(int));
    printf("bytes=%d\n", bytes);
    return 0;
}

#include <stdio.h>

int main(void) {
    int count = ;
    int bytes = (int)(count * sizeof(int));

    printf("int=%zu\n", sizeof(int));
    printf("bytes=%d\n", bytes);
    return 0;
}

#include <stdio.h>

int main(void) {
    int count = ;
    int bytes = (int)(count * sizeof(int));

    printf("int=%zu\n", sizeof(int));
    printf("bytes=%d\n", bytes);
    return 0;
}

sizeof `sizeof(int)` returns the byte count for one `int`.

byte count Multiplying by a count estimates how many bytes a sequence of values needs.