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Question

Please Explain how if statement is working here I am new in c++.

#include <iostream>
using namespace std;
int main (){

    int b=6,c=5;
    if (b++==7 && ++c==5)
    {
        b*=c;
        cout<<"IF OUTPUT IS "<<++b<<endl;
    }
    else 
        cout<<"ELSE 1ST OUTPUT "<<b--<<endl;
    cout<<"ELSE 2ND  OUTPUT IS "<<b<<endl;

    return 0 ;
}

  

Answer 1

In the above code since inside the if condition you are checking post increment , (b++ ==7) and the initial value of b is 6 so the compiler first evaluates the first condition of b++==7 considering b=6 only and then modifies its value to 7 hence evaluating the initial condition as false because 6==7 results in false while for ++c==5 as this is pre increment it first modifies the value of c to 6 and then checks the condition 6===5 which is also false. Due to this both condition results in false and the program control goes to the else part of the code. In the else print considering post decrement in the first print statement the value of b is printed as 7 only and later on decremented by 1 printing 6 in next statement.