Variables problem

Question

#include<iostream>
using namespace std;
int main (){
int a = 5;
int b = 2;
cin >> a;
cin >> b;
int sum = a + b;
cout<< sum;
return 0;
}

What’s wrong with that code ?
Every time I run it it just gives me 14 which Is the wrong answer.
It is supposed to be 7.

Answer 1

#include<iostream>
using namespace std;
int main (){
int a = 5;
int b = 2;
int sum = a + b;
cout<< sum;
return 0;
}

Or

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

Answer 2

Why can’t we write cin , declare and assign the value at the same code ?

Answer 3

Thanks ✨

Answer 4

The second one isn’t working properly

Answer 5

You can, only as you see, this leads to incorrect results. although in theory, after entering values ​ manually, the value previously entered in the variable should disappear. try to figure it out why this is happening

Answer 6

https://code.sololearn.com/c5T0o7HZyKvR/?ref=app

Answer 7

Explanation: 20% of 50 is 10.
To calculate 20% of a given amount, you can multiply the number by 20 and divide it by 100: 50*20/100 = 10.0

please write code In python