csizes

csizes.c

/*
 *  gcc -std=c99 csizes.c -o csizes
 */
#include <stddef.h>
#include <stdio.h>

#define print_size(type) \
        printf("%12s = %zd\n", #type, sizeof(type));

int main(void) {

        print_size(char);
        print_size(short);
        print_size(int);
        print_size(long int);
        print_size(long);
        print_size(long long);
        print_size(float);
        print_size(double);
        print_size(long double);
        print_size(void *);
        print_size(size_t);
        print_size(ptrdiff_t);

        return 0;
}