Question about logical operators

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3.00/5 (2 votes)

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C++

#include <stdio.h>
#include <conio.h>
void main()
{
int a=5,b=10,c=15;


int d=a||b&&c;

printf("%d",d);
getch();
}

The output is true 1, but I do not understand how this output comes.

Posted 19-Oct-11 21:35pm

umairshoaib

Updated 19-Oct-11 21:38pm

André Kraak

v2

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André Kraak 20-Oct-11 3:39am

DO NOT SHOUT when asking a question. When you use all capital letters it is seen as shouting on the Internet and considered rude. Next time when posting a question please use proper capitalization.

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OriginalGriff · Answer 1 · 2011-10-19T21:40:00

Solution 2

In C, any non-zero value is true, and only zero is false. So, when evaluating your expression (and ignoring precedence rules because they don't matter in this example)

true OR true AND true

will always be true. So a non-zero value will be returned. In this case, the C compiler returns 1 for true. Simples!

Posted 19-Oct-11 21:40pm

OriginalGriff

Comments

Albert Holguin 1-Nov-11 10:23am

+5

NewPast · Answer 2 · 2011-10-19T21:38:00

Solution 1

|| and && consider any non zero as true
they are boolean oprators

Posted 19-Oct-11 21:38pm

NewPast