Question

Sum of Numbers: Write a program that asks the user for a positive integer value.
The program should use a loop to get the sum of all the integers from 1 up to the number entered.

For Example, if the user enters 50, the loop will find the sum of 1,2,3,4,…50.

C++

Answer 1

c++

#include <iostream>
#include <cstdlib>

const int ZERO = 0;
using namespace std;

int main()
{
int target;
int count;
int sum = 0;
cout << "This program asks the user for a positive integer value." <<endl
<< "then it will sum of all the integers from 1 up to the number entered."<<endl<<endl;

cout << "Enter a positive integer value: " <<endl;
cin >> target;

if (target > ZERO)
{
count = 1;
while (count <= target)
{
sum += count;
count++;
}
}

else
{
cout << "You did not enter a positive integer value. Restart and try again.";
exit(0);
}

cout << "The sum of all the integers from 1 up to " << target <<" is: " << sum << endl;

return 0;
}

Answer 2

#include "stdio.h"

int main(int argc)
{
long num=0;
long total=0;

printf("Enter a number: ");
scanf("%i",&num);
int x=1;
while(x<=num){
total+=x;
x++;
}
printf("nThe sum of the first %i numbers is %i.",num,total);
return 0;
}