C++ problems

[Xanter2002]

Hello everyone, I am a starter in C++ and as homework I have to calculate a*b=c and a-b=d, but I have a problem about the b.

Let's say that I have these numbers: 12 and 3.

The a is read correctly, but b isn't

this is the code:  

#include <iostream>
     using namespace std;
     int main ()
     {
         int a,b,c,d;
         cin>>a,b;
         c=a*b;
         d=a-b;
         cout<<c<<" "<<d;
     }

I cannot see any difference between this and the others that I have as homework and the ones that I made in class.

Could you help me?

[Xanter2002]

Nevermind, I found the problem!

[Mira Yurizaki]

7 minutes ago, Xanter2002 said:

Nevermind, I found the problem!

Can you elaborate for the record? :3

[Xanter2002]

1 minute ago, M.Yurizaki said:

Can you elaborate for the record? :3

It means to write what was the problem?

 

[Mira Yurizaki]

Just now, Xanter2002 said:

It means to write what was the problem?

 

What was the solution?

[reniat]

good on you for figuring it out, but I would point out that it's a bad habit to treat the = in programming like the = in math.

 

19 minutes ago, Xanter2002 said:

a*b=c and a-b=d

doesn't make sense in programming, since you can't set the multiplication of two values to a different value. Think of = in programming as a "set to" operation, and unless you are making up your own vector space axioms you are probably not going to be trying to set what the product of 2 numbers should be, as opposed to setting some value to the product of 2 numbers.

 

The reason it kind of matters, is because a*b=c could actually be something in programming (well, close it's missing some syntax). You could be assigning the memory address found at a*b to the value of c, but since you're not talking about that in this case, you don't want to confuse anyone.

[Xanter2002]

In the cin, before b is <<, not a comma :3

[Xanter2002]

1 minute ago, reniat said:

good on you for figuring it out, but I would point out that it's a bad habit to treat the = in programming like the = in math.

 

doesn't make sense in programming, since you can't set the multiplication of two values to a different value. Think of = in programming as a "set to" operation, and unless you are making up your own vector space axioms you are probably not going to be trying to set what the product of 2 numbers should be, as opposed to setting some value to the product of 2 numbers.

I know, but there I wrote in short the exercice that I had, but if you look in the program, you can see that I wrote correctly.