Question

(5 Marks) 3 Write a C sentinel-controlled while loop that will compute the sum of integers entered by the user ending with 999. Include all declaration and initialization of variables. Also, output the sum.

Answer 1

#include <iostream>
using namespace std;

int main()
{
   // Declare the integer variables num and sum to hold the user input and total sum
   int num, sum;
   // Intialize the variables to zero
   sum = num = 0;
   do
   {
       // Add the number entered by user to the sum
       sum = sum + num;
       // Ask user for input
       cout<<"Input a number: ";
       //Read input number from user
       cin >> num;
   }
   // If the user inputs 999, then terminate the loop. Else add number to sum and read input again
   while(num != 999);
  
   // Display the sum of user inputs
   cout<<endl<<"Sum of integers : " <<sum <<endl;
}

root@Malware: /mnt/d/Programs # root@Malware : /mnt/d/Programs # root@Malware : /mnt/d/Programs# Input a number: 5 Input a number: 7 Input a number: 45 Input a number: 23 Input a number: 4 Input a number: 912 Input a number: 988 Input a number: 999 TEXTBOOK SOL ./a.out Sum of integers 1984 root@Malware : /mnt/d/Programs # root@Malware : /mnt/d/Programs # root@Malware: /mnt/d/Programs#

Note: As user input 999 is used as a terminating condition, it must not be added to the sum. But if you requirement needs 999 also to be added, then kindly refer below program. Ping me back for any more requirement or doubts. Thanks.

#include <iostream>
using namespace std;

int main()
{
   // Declare the integer variables num and sum to hold the user input and total sum
   int num, sum;
   // Intialize the variables to zero
   sum = num = 0;
   // If the user inputs 999, then terminate the loop.
   while(num != 999)
   {
       // Ask user for input
       cout<<"Input a number: ";
       //Read input number from user
       cin >> num;
       // First Add the number entered by user to the sum without checking for 999
       // if number is 999 then terminate after adding to sum
       sum = sum + num;
   }
  
   // Display the sum of user inputs
   cout<<endl<<"Sum of integers : " <<sum <<endl;
}