CODEWITHSUNDEEP
c++c++11visual-c++c++14c++builder
at-bernard
at-bernard

Reputation: 73

Why do the max values of long and long long produce the same output?

#include <iostream>
using namespace std;
#include <climits>

int main () {

    int n_int = INT_MAX;
    short n_short = SHRT_MAX;
    long n_long = LONG_MAX;
    long long n_llong = LLONG_MAX;

    cout << "int is " << sizeof (int) << " bytes." << endl;
    cout << "short is " << sizeof n_short << " bytes." << endl;
    cout << "long is " << sizeof n_long << " bytes." << endl;
    cout << "long long is " << sizeof n_llong << " bytes." << endl;
    cout << endl;

    cout << "Maximum values:" << endl;
    cout << "int:   " << n_int << endl;
    cout << "short: " << n_short << endl;
    cout << "long:  " << n_long << endl;
    cout << "llong: " << n_llong << endl << endl;
    //cout << endl;

    cout << "Minimum int value = " << INT_MIN << endl;
    cout << "Maximum int value = " << INT_MAX << endl;
    cout << "Bits per byte = " << CHAR_BIT << endl;

    return 0;
}

OUTPUT: The long and long long variables are producing the exact same maximum values, I'm not sure why. The long value is supposed to output the maximum value of 2147483647.

int is 4 bytes.
short is 2 bytes.
long is 8 bytes.
long long is 8 bytes.
Maximum values:
int:   2147483647
short: 32767
long:  9223372036854775807
llong: 9223372036854775807
Minimum int value = -2147483648
Maximum int value = 2147483647
Bits per byte = 8

Upvotes: 1

Views: 2527

Answers (1)

Brian Bi
Brian Bi

Reputation: 119229

long is not guaranteed to be 32 bits long; it merely has to be at least 32 bits long. Your implementation has defined long to have 64 bits. Note that even though long and long long have the same range on your implementation, they are nevertheless distinct types.

Upvotes: 9

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