Calculate range of data types using C++

Difficulty Level : Medium
Last Updated : 12 Jan, 2018

C++ program for printing the range data type like int, char, short.

Signed Data Types

METHOD
1.) calculate total number of bits by multiplying sizeof with 8 (say n)
2.) Calculate  -2^(n-1) for minimum range
3.) Calculate  (2^(n-1))-1 for maximum range

// CPP program to calculate  
// range of signed data type 
#include <bits/stdc++.h> 
#define SIZE(x) sizeof(x) * 8 
using namespace std; 
  
// function to calculate range of 
//unsigned data type 
void printSignedRange(int count) 
{ 
    int min = pow(2, count - 1); 
    int max = pow(2, count - 1) - 1; 
    printf("%d to %d", min * (-1), max); 
} 
  
// DRIVER program 
int main() 
{ 
    cout << "signed char: "; 
    printSignedRange(SIZE(char)); 
    cout << "\nsigned int: "; 
    printSignedRange(SIZE(int)); 
    cout << "\nsigned short int: "; 
    printSignedRange(SIZE(short int)); 
  
    return 0; 
} 

Output:

signed char: -128 to 127
signed int: -2147483648 to 2147483647
signed short int: -32768 to 32767

Unsigned Data Types

METHOD
1.)Find number of bits by multiplying result of sizeof with 8 say n
2.)minimum range is always zero for unsigned data type
3.)for maximum range calculate 2^n-1

// CPP program to calculate range  
// of given unsigned data type 
#include <bits/stdc++.h> 
#define SIZE(x) sizeof(x) * 8 
using namespace std; 
  
// function to calculate range  
// of given unsigned data type 
void UnsignedRange(int count) 
{ 
    // calculate 2^number of bits 
    unsigned int max =  pow(2, count) - 1; 
  
    cout << "0 to " << max; 
} 
  
// DRIVER program 
int main() 
{ 
    cout << "unsigned char: "; 
    UnsignedRange(SIZE(unsigned char)); 
    cout << "\nunsigned int: "; 
    UnsignedRange(SIZE(unsigned int)); 
    cout << "\nunsigned short int: "; 
    UnsignedRange(SIZE(unsigned short)); 
    return 0; 
} 

Output:

unsigned char: 0 to 255
unsigned int: 0 to 4294967295
unsigned short int: 0 to 65535

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