show_c_sizeof.c

/*
usage:
gcc -o show_c_sizeof show_c_sizeof.c && ./show_c_sizeof
*/

#include <stdio.h>

#define S(type) \
printf("sizeof(" #type ") = %d\n", (int)(sizeof(type)))

int main()
{
  S(bool);
  S(char);
  S(short);
  S(int);
  S(long);
  S(long long);
  S(size_t);
  return 0;
}

sizes.txt

## 32bit system

sizeof(char) = 1
sizeof(short) = 2
sizeof(int) = 4
sizeof(long) = 4
sizeof(long long) = 8
sizeof(size_t) = 4

## 64 bit Linux

sizeof(char) = 1
sizeof(short) = 2
sizeof(int) = 4
sizeof(long) = 8
sizeof(long long) = 8
sizeof(size_t) = 8

## 64 bit Mac OS

sizeof(char) = 1
sizeof(short) = 2
sizeof(int) = 4
sizeof(long) = 8
sizeof(long long) = 8
sizeof(size_t) = 8