# Calculate range of data types using C++

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 #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 #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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