Related to conditional statements

Question

1.00/5 (2 votes)

See more:

What does if(!a>="some number") mean?
is it same as if a is not greater than or equal to some number ??????
Like what will be the outcome of following?

C#

#include<iostream>
using namespace std;
int main()
{
	int a=500,
	b=100,
	c;
	if(!a>=600)
	b=300;
	c=200;
	cout<<b<<c;
	return 0;
}

What I have tried:

I tried understanding it as follow

if a is not greater than or equal to some number
so according to me it satisfies the following that a is not greater than or equal to 600 as it is initialised to 500, So b should change its value from 100 to 300.
plz tell where i am going wrong?

Posted 6-Dec-16 7:02am

Member 12890185

Updated 6-Dec-16 21:20pm

KarstenK

v3

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Comments

CHill60 6-Dec-16 13:15pm

Is 'a' a numeric?

Member 12890185 6-Dec-16 13:18pm

yes
the actual question is
#include<iostream>
using namespace std;
int main()
{
int a=500,
b=100,
c;
if(!a>=600)
b=300;
c=200;
cout<<b<<c;
return 0;
}

Patrice T 6-Dec-16 13:24pm

Use Improve question to update your question.
So that everyone can pay attention to this information.

Member 12890185 6-Dec-16 13:26pm

@ppolymorphe
I have updated it now..
please help me out..

[no name] 6-Dec-16 13:30pm

"what will be the outcome of following?", run it and find out for yourself. Why are you making things so complicated? if (a < 600)

Member 12890185 6-Dec-16 13:34pm

that's what i did
according to me the answer should be 300 and 200 but on compilation it gives 100 and 200 >>>>

[no name] 6-Dec-16 13:42pm

Doesn't matter what "according to you" is or is not. It actually does not do anything at all "on compilation". You would have to run the resulting exe first to get any result. And I would suspect that the order or precedence is giving you the answer you get. AND you are making things harder on yourself which is adding to your confusion. You are applying a logical NOT operator to the a variable which is changing what you think it should be. Make things easy on yourself and write simple code. It's easier to debug and doesn't cause confusion when things don't happen that you think should happen.

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Patrice T · Accepted Answer · 2016-12-06T07:40:00

Solution 2

It is all about operator precedence
C++ Operator Precedence - cppreference.com[^]
! have higher precedence than >=
It means that

C++

if(!a>=600)

is

C++

if((!a)>=600)

and in C 0 means false and any values not zero is true
so for a=500, !a is 0 and you have

C++

if(0>=600)

Posted 6-Dec-16 7:40am

Patrice T

Updated 6-Dec-16 7:42am

v2

Comments

CPallini 6-Dec-16 15:51pm

5.

Patrice T 6-Dec-16 15:53pm

Thank you.

CHill60 6-Dec-16 19:08pm

5'd. I'd originally posted a C# response and realised I was being unobservant. Called myself a few names and deleted my solution (hence yours is "2")

Patrice T 6-Dec-16 19:13pm

Thank you very much.