C++ help with addition code

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Hello, I am in school and this is the first time when i use C++. My teacher sent me a code for addition of 2 numbers. I copyed it, pasted it in c++ compiler but it doesn't give me what i want.
The code is this:

C++

#include <iostream>
using namespace std;
int main()
{
    int a,b,s;
    cout<<"a=";
    cin>>a;
    cout<<"b=";
    cin>>b;
    s=a+b;
    cout<<"a+b="<<s;
    return 0;
}

When i run it, it says:

/tmp/MHJO6VFZiA.o
a=

What I have tried:

Also, if i put a=1 or anything like that, after i run it it says:a=1

Posted 14-Apr-21 0:00am

Member 15151299

Updated 14-Apr-21 0:52am

CPallini

v2

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Richard MacCutchan 14-Apr-21 6:19am

The program is waiting for you to enter the values for a and b.

Member 15151299 14-Apr-21 6:27am

I did, but it doesn't work.
When i run it, it only reads "a"

/tmp/yIpmsW4M9l.o
a=1

Richard MacCutchan 14-Apr-21 6:32am

When you see the message a= you need to reply with a number. this is the result I got when I ran the code:

C:\Users\rjmac\Documents\VSCode\C++>test
a=23
b=44
a+b=67

The values 23 and 44 are what I typed in.

Member 15151299 14-Apr-21 6:42am

Now i understand, i wasn't replying with a number. Thank you soooo much.

Richard MacCutchan 14-Apr-21 6:36am

I just tried on that website and it works OK.

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CPallini · Answer 1 · 2021-04-14T00:12:00

Solution 1

Your code compiles and runs fine.
I made a test on my Linux box:

$ g++ -Wall add.cpp
$ ./a.out 
a=1
b=2
a+b=3$

Posted 14-Apr-21 0:12am

CPallini

Comments

Member 15151299 14-Apr-21 6:18am

When i run this code on https://www.programiz.com/cpp-programming/online-compiler/
Is only shows:
/tmp/yIpmsW4M9l.o
a=1

Is the site the one causing my problem?

CPallini 14-Apr-21 6:31am

Maybe. I suggest you to use a compiler on your local machine.
Anyway, I've just got
/tmp/S9Z8SCaE7w.o
a=1
b=2
a+b=3
on the same site.

OriginalGriff · Answer 2 · 2021-04-14T00:52:00

I also just tried your code, using https://www.onlinegdb.com/online_c++_compiler[^] and it ran fine.
If I enter:

23
17

Then it prints "40" which is correct.
The only way I could get it to go wrong is not to enter an integer number: "a=1" or "10.5" give be the "wrong" result because there is no error checking in your code.