The goal of this programme was for us to write a programme that could, when compiled on a given system, tell us certain things about the system that are not necessarily portable, such as the size and ranges of the built in data types for the local C compiler (CC).

Below is the source code…

#include <iostream>
#include <string>
#include <cstdlib>

int main(){
	bool b = false;
	std::cout << "                     Size of bool: " << sizeof(bool) << "B" << std::endl;
	std::cout << "              Lower bound of bool: " << b << std::endl;
	std::cout << "              Upper bound of bool: " << (bool)(b - 1) << std::endl << std::endl;
	
  signed char sc = 0; signed char sc2 = 0;
  std::cout << "              Size of signed char: " << sizeof(sc) << "B" << std::endl;
	sc2 = (unsigned char)(sc - 1)/2 + 1;
  std::cout << "       Lower bound of signed char: " << (signed int)(sc2) << std::endl;
	sc2 = (unsigned char)(sc - 1)/2;
	std::cout << "       Upper bound of signed char: " << (signed int)(sc2) << std::endl << std::endl;
	
	unsigned char uc = 0;
	std::cout << "            Size of unsigned char: " << sizeof(uc) << "B" << std::endl;
	std::cout << "     Lower bound of unsigned char: " << (unsigned int)(uc) << std::endl;
	std::cout << "     Upper bound of unsigned char: " << (unsigned int)((unsigned char)(uc -1)) << std::endl << std::endl;
	
	signed short int ssi = 0; signed short int ssi2 = 0;
	std::cout << "         Size of short signed int: " << sizeof(ssi) << "B" << std::endl;
	ssi2 = (unsigned short int)(ssi - 1)/2 + 1;
	std::cout << "  Lower bound of signed short int: " << ssi2 << std::endl;
	ssi2 = (unsigned short int)(ssi - 1)/2;
	std::cout << "  Upper bound of signed short int: " << ssi2 << std::endl << std::endl;
	
	unsigned short int usi = 0;
	std::cout << "       Size of unsigned short int: " << sizeof(usi) << "B" << std::endl;
	std::cout << "Lower bound of unsigned short int: " << usi << std::endl;
	std::cout << "Upper bound of unsigned short int: " << usi - 1 << std::endl << std::endl;
	
	signed int si = 0; signed int si2 = 0;
	std::cout << "               Size of signed int: " << sizeof(si) << "B" << std::endl;
	si2 = (unsigned int)(si - 1)/2 + 1;
	std::cout << "        Lower bound of signed int: " << (si2) << std::endl;
	si2 = (unsigned int)(si - 1)/2;
	std::cout << "        Upper bound of signed int: " << (si2) << std::endl << std::endl;
	
	unsigned int ui = 0;
	std::cout << "             Size of unsigned int: " << sizeof(ui) << "B" << std::endl;
	std::cout << "      Lower bound of unsigned int: " << ui << std::endl;
	std::cout << "      Upper bound of unsigned int: " << ui - 1 << std::endl << std::endl;
	
	signed long sl = 0; signed long sl2 = 0;
	std::cout << "              Size of signed long: " << sizeof(sl) << "B" <<  std::endl;
	sl2 = (unsigned long)(sl - 1)/2 + 1;
	std::cout << "       Lower bound of signed long: " << sl2 << std::endl;
	sl2 = (unsigned long)(sl -1)/2;
	std::cout << "       Upper bound of signed long: " << sl2 << std::endl << std::endl;
	
	unsigned long ul = 0;
	std::cout << "            Size of unsigned long: " << sizeof(ul) << "B" << std::endl;
	std::cout << "     Lower bound of unsigned long: " << ul << std::endl;
	std::cout << "     Upper bound of unsigned long: " << ul - 1 << std::endl << std::endl;
	
	signed long long sll = 0; signed long long sll2 = 0;
	std::cout << "         Size of signed long long: " << sizeof(sll) << "B" <<  std::endl;
	sll2 = (unsigned long long)(sll - 1)/2 + 1;
	std::cout << "  Lower bound of signed long long: " << sll2 << std::endl;
	sll2 = (unsigned long long)(sll - 1)/2;
	std::cout << "  Upper bound of signed long long: " << sll2 << std::endl << std::endl;
	
	unsigned long long ull = 0;
	std::cout << "       Size of unsigned long long: " << sizeof(ull) << "B" << std::endl;
	std::cout << "Lower bound of unsigned long long: " << ull << std::endl;
	std::cout << "Upper bound of unsigned long long: " << ull - 1 << std::endl << std::endl;
  float flt = 0;
  std::cout << "Size of float: " << sizeof(flt) << std::endl;
  
  double dbl = 0;
  std::cout << "Size of double: " << sizeof(dbl) << std::endl;
  return 0;
}

Below is the output, on my system

doug@slackware14:~/Data Structures/src/data_types2$ ./main
                     Size of bool: 1B
              Lower bound of bool: 0
              Upper bound of bool: 1

              Size of signed char: 1B
       Lower bound of signed char: -128
       Upper bound of signed char: 127

            Size of unsigned char: 1B
     Lower bound of unsigned char: 0
     Upper bound of unsigned char: 255

         Size of short signed int: 2B
  Lower bound of signed short int: -32768
  Upper bound of signed short int: 32767

       Size of unsigned short int: 2B
Lower bound of unsigned short int: 0
Upper bound of unsigned short int: -1

               Size of signed int: 4B
        Lower bound of signed int: -2147483648
        Upper bound of signed int: 2147483647

             Size of unsigned int: 4B
      Lower bound of unsigned int: 0
      Upper bound of unsigned int: 4294967295

              Size of signed long: 8B
       Lower bound of signed long: -9223372036854775808
       Upper bound of signed long: 9223372036854775807

            Size of unsigned long: 8B
     Lower bound of unsigned long: 0
     Upper bound of unsigned long: 18446744073709551615

         Size of signed long long: 8B
  Lower bound of signed long long: -9223372036854775808
  Upper bound of signed long long: 9223372036854775807

       Size of unsigned long long: 8B
Lower bound of unsigned long long: 0
Upper bound of unsigned long long: 18446744073709551615

Size of float: 4
Size of double: 8