CSAPP 习题2.45 int_size_is_32

// 查看你机器上的int型是不是32位，不用sizeof ;-)


// left shift int 0x01, until the bit '1' hits the highest digit and makes the integer negative


#include <iostream>

using namespace std;

bool int_is_32_bit()
{
int digit_count = 1;
int i = 1;
while(i > 0)
    {
      i = (i<<1);
      digit_count++;
    }
if (digit_count == 32)
    return true;
else
    return false;
}

int main()
{
if (int_is_32_bit())
    cout << "int is 32 bits." << endl;
else
    cout << "int is not 32 bits." << endl;
return 0;
}