How is it possibble? Question is " predict the output".

Question

1.00/5 (1 vote)

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C++

#include <iostream>
using namespace std;

int main()
{
    if (sizeof(int) > -1)
        cout << "Yes";
    else
        cout << "No";
    return 0;
}

What I have tried:

according to me the answer should be yes.
ut the correct answer is no.
how is it possibble?

Posted 7-Dec-18 4:32am

Prateek Krishna

Updated 8-Dec-18 22:21pm

KarstenK

v2

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Richard MacCutchan · Accepted Answer · 2018-12-07T04:41:00

Solution 1

Because the sizeof operator returns an unsigned value. So the compiler then treats -1 also as an unsigned value. The hexadecimal value of -1 is 0xFFFFFFFF or unsigned decimal 4294967295, which of course is much greater than the size of an integer (which is 4 (not 8)). One of the pitfalls of mixing signed and unsigned values in software.

Posted 7-Dec-18 4:41am

Richard MacCutchan

Updated 9-Dec-18 1:56am

v2

Comments

Prateek Krishna 7-Dec-18 23:35pm

Thank you Sir !
but size of int is 4 ..

KarstenK 9-Dec-18 4:22am

assign -1 to an uint and see. :-O

Richard MacCutchan 9-Dec-18 7:55am

You are correct but it is just the same.