ERROR.......non-lvalue in increment

[nidamunir47]

Program won't compile..What is this error..Please explain?


#include<iostream>
using namespace std;
main()
{
int num1=0,num2=10,result;
num1++;
result=++(num1+num2); //error:non-lvalue in increment
cout<<num1<<" "<<num2<<" " <<result;
system("pause");
return 0;

}

[weaknessforcats]

(num1+num2) written this way is an expression which is only true or false. A binary value cannot be incremented.

Just use a variable instead:

int sum;
    sum = num1+num2;
    ++sum;