Pointer sizes... sizeof(char*) = 4 sizeof(void*) = 4 sizeof(void(*)(void)) = 4 Integer sizes... sizeof(char) = 1 sizeof(short) = 2 sizeof(int) = 4 sizeof(long) = 4 sizeof(long long) = 8 Floating-point sizes... sizeof(float) = 4 sizeof(double) = 8 sizeof(long double) = 16