Sum or Product

 Sum or Product

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Write a program that asks the user for a number N and a choice C. And then give them the possibility to choose between computing the sum and computing the product of all integers in the range 1 to N (both inclusive).

If C is equal to -

 1, then print the sum
 2, then print the product
 Any other number, then print '-1' (without the quotes)

Input format :

Line 1 : Integer N
Line 2 : Choice C

Output Format :

 Sum or product according to user's choice

Constraints :

1 <= N <= 12

Sample Input 1 :

10
1

Sample Output 1 :

55

Sample Input 2 :

10
2

Sample Output 2 :

3628800

Sample Input 3 :

10
4

Sample Output 3 :

-1

#include<iostream>
using namespace std;
int main() {
    // Write your code here
    int n,sum=0,prod=1,c;
    cin>>n>>c;
    for(int i=1;n>=i;i++){
        if(c==1){
            sum=sum+i;
        }
        else if(c==2){
            prod=prod*i;
        }
        else{
            cout<<-1;  //needed to print -1 not return it
            return 0;
        }
        
    }
   if(c==1)cout<<sum;    //need to one of product or sum depending on c not both
   else if(c==2)cout<<prod;
}