Question

Write a function sum_int( n ) to compute the sum of the integers from 1 up to and including n.

Answer 1

Dear Student,

here is the C++ program which implement this.

NOTE: Please not that the below program is tested on ubuntu 14.04 sytem and compiled under g++ compiler.

Program:

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#include <iostream>

#include <stdlib.h>

using namespace std;

//function prototype

int sum_int(int n);

int main()
{
    int num;

    cout<<"Enter a Natural number: ";

    cin >> num;

    cout<<"Sum of the integer from 1 to "<<num<<" Number is "<<sum_int(num)<<endl; //Function Calling

    return 0;
}

//Recursive Function Prototype

int sum_int(int n)

{
    if(n != 0)

        return n + sum_int(n-1);

    else

        return n;
}

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Here i have attached the output of the program as a screen shot..

Output:

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Kindly Check and Verify Thanks....!!!