Question

Program 6: Sums and Averages.                                                  

Assigned                 Wednesday,  10/05/16  
Program Due              Wednesday,  10/12/16 ,  at start of class.

Write a program in c++ that asks the user to input a list of numbers, 
one at a time, until the user is finished.

The program should keep track of how many numbers, how many positive numbers,
and how many negative numbers were entered. It should also calculate the
sums for each of these (positives, negatives, and total).

After exiting the loop, the program should calculate the averages for each
(positives, negatives, and total).

Then output the sums and their averages, with labels describing each output
appropriately.

Note that there may be no positives, or no negatives, or no numbers at all
in a list! Also, a 0 counts as a number in the overall list, but it doesn't
counts as positive or negative.

Allow the user to enter as many lists as they like.

Note that there is no data check for a bad number -- any integer is valid!

Data to test/run:

---------------------------------------------------------------

Dataset 1:

(empty)

---------------------------------------------------------------

Dataset 2:

  10
 -13
   0
  26
 -17

---------------------------------------------------------------

Dataset 3:

 -10
 -20
 -45

---------------------------------------------------------------

Dataset 4:

 10
 30
 80

---------------------------------------------------------------

Dataset 5:

 0
 0
 0
 
---------------------------------------------------------------

 

Answer 1

Program:

#include<iostream>

using namespace std;

int main()
{
   int num, NoOfPositiveNumbers=0,NoOfNegativeNumbers=0, TotalNumbers=0;
   float sumOfPositives=0,sumOfNegatives=0,total=0;
   float avgOfPositives=0,avgOfNegatives=0,avg=0;
  
   bool repeat =true;
  
   //read numbers from user until the user enters 77777( 5 sevens)
   //i used 77777 as sentinel value to exit the loop
   cout<<"Enter numbers (77777 to exit): ";
   do
   {
       cin>>num;
      
       //check if number enter is not sentinel and if number is negative
       //if so increment the count of negatives and add it to sum of negatives
       //also get the total here
       if(num<0 && num!=77777)
       {
           NoOfNegativeNumbers=NoOfNegativeNumbers+1;
           sumOfNegatives=sumOfNegatives+num;
           total=total+num;
           TotalNumbers=TotalNumbers+1;
       }
      
       //check if number enter is not sentinel and if number is positive
       //if so increment the count of positives and add it to sum of positives
       //also get the total here
       else if(num>0 && num!=77777)
       {
           NoOfPositiveNumbers=NoOfPositiveNumbers+1;
           sumOfPositives=sumOfPositives+num;
           total=total+num;
           TotalNumbers=TotalNumbers+1;
       }
      
       //check if number enter is not sentinel and if number is 0
       //if so increment the count of total
       else if(num==0 && num!=77777)
       {
           TotalNumbers=TotalNumbers+1;
           total=total+num;
       }
      
       //if sentinel value is entered exit the loop
       else if(num==77777)
       {
           repeat=false;
       }
          
   }while(repeat);
   //calculate the averages and display results
   if(TotalNumbers>0)
   {
       if(NoOfPositiveNumbers==0)
       {
           avgOfPositives=0;
       }
       else
       {
           avgOfPositives=sumOfPositives/NoOfPositiveNumbers;
       }
      
       if(sumOfNegatives==0)
       {
           avgOfNegatives=0;
       }
       else
       {
           avgOfNegatives=sumOfNegatives/NoOfNegativeNumbers;
       }
          
       avg=total/TotalNumbers;
  
       cout<<"\nTotal Numbers: "<<TotalNumbers<<"\tSum: "<<total<<"\tAverage: "<<avg;
       cout<<"\nTotal Positives: "<<NoOfPositiveNumbers<<"\t"<<"Sum of Positives: "<<sumOfPositives<<"\tAverage of Positives: "<<avgOfPositives;
       cout<<"\nTotal Negatives: "<<NoOfNegativeNumbers<<"\t"<<"Sum of Negatives: "<<sumOfNegatives<<"\tAverage of Negatives: "<<avgOfNegatives;
   }
   else
   {
       cout<<"\nThe dataset is empty.";
   }
  
  
   return 0;
}

Output:

C.Users Vicky Desktop\DevC++Programs ListOfNumbers.exe Enter a number 〈????? to exit); ??777 The dataset is empty Process exited after 4.392 seconds with return ualue Press any key to continue - . -

C.Users Vicky Desktop\DevC++Programs ListOfNumbers.exe 13 26 17 Total Numbers: 5 Total Positiues 2 Total Negatives: 2 Sum: 6 Average: 1.2 Sum of Positives: 36 Auerage of Positives: 18 Sum of Negatives Average of Negatives: -15 Process exited after 20.46 seconds with return value 0 Press any key to continue - - -

C.Users Vicky Desktop\DevC++Programs ListOfNumbers.exe 20 45 Total Numbers: 3 Total Positives 0 Total Negatives: 3 Sum: 75 Sum of Positives: Average of Positives 0 Sum ofNegatives: -75 Average of Negatives 25 Average -25 Process exited after 1 Press any key to continue - 4.86 seconds with return value 0

C.Users Vicky Desktop\DevC++Programs ListOfNumbers.exe Enter numbers 〈????? to exit): 10 30 80 Total Numbers 3 Total Positives 3 Total Negatives: 0 Sum: 120 Sum of Positives: 120 Average of Positives: 40 Sum of Negatives: 0 Average: 40 Average of Negatives: 0 Process exited after 11.7 seconds with return value 0 Press any key to continue - -

C:Users Vicky Desktop\DevC++Programs ListOfNumbers.exe Enter numbers 〈????? to exit): 0 Total Numbers: 3 Total Positives 0 Total Negatives: 0 Sum: Average: 0 Sum of Positives: Average of Positives0 Sum of Negatives:Average of Negatives:0 Process exited after 4.693 seconds with return value 0 Press any key to continue - - - _