How did this value come out : -2

Question

int func(int a=2, int b=5){
return b-a;
}
int main (){
int k=7;
cout<<func(k);
}

Answer 1

Since you have default values 2 and 5 in function params if you call function without params you get 3, BUT since you call function with k=7, param a become equal to 7 and param be still 5 so b-a = -2