I do not undersand why this program does not works

Question

#include <iostream>
using namespace std;

int main()
{
int a, b;
cout << "Enter a number \n";
cin >> a;
cout << "Enter another number \n";
cin >> b;
int sum = a + b
cout << sum
cout << a << " "<< b;

return 0;
}

Answer 1

thanks a lot

Answer 2

becoz u wern't define sum previously in input....nd after that u dont semicolon after int sum =a+b;

Answer 3

It not working because you did not pre declare the variable" sum", and you made syntax errors
The correct code is below.
Note the bugs are commented on:

#include <iostream>
using namespace std;

int main()
{
int a, b, sum;
cout << "Enter a number \n";
cin >> a;
cout << "Enter another number \n";
cin >> b;
sum = a + b //Bug 1 -> failed to preDeclare sum
cout << sum; //Bug 2 -> no semi-colon.
cout << " " << a << " "<< b;
/*
added an extra space, just to differentiate between sum and variable a.
*/
return 0;
}

Answer 4

cause you forgot semicolmn ';' here :
int sum=a+b;
coût<<sum;