C Program to Calculate the Sum and Average of n Number

In this article we will show you, How to write a C Program to calculate the Sum and Average of N number using For Loop, While Loop and Do While Loop.

C Program to find Sum and Average of n Number using For Loop

This C program allows the user to enter the number (n) he wish to calculate the average and sum. Next it will ask the user to enter individual item up to declared number. Using the For loop in C Programming it will calculate the sum and later it will calculate the average.

#include<stdio.h>

void main()
{
  int i,n,Sum=0,numbers;
  float Average;

  printf("\nPlease Enter How many Number you want?\n");
  scanf("%d",&n);

  printf("\nPlease Enter the elements one by one\n");
  for(i=0;i<n;++i)
   {
     scanf("%d",&numbers);
     Sum = Sum +numbers;
   }

  Average = Sum/n;

  printf("\nSum of the %d Numbers = %d",n, Sum);
  printf("\nAverage of the %d Numbers = %.2f",n, Average);

  return 0;
}

OUTPUT:

ANALYSIS:

First printf statement will ask the user to enter n value. For example if the user enters 2 then, second printf statement will ask the user to enter those 2 values one after the other.
For loop will resist the user, not to enter more than 2 values by using the condition i<n.
In the next line we added the entered value to sum.
After completing this it will start the second iteration. For the 3rd iteration the condition (i<n) will fail so, it will exit from the loop.
Outside the loop we calculated the average using the formula sum/n. In our example it is 30/2 = 15

C Program to find Sum and Average of n Number using While Loop

This program allows the user to enter the number (n) he wish to calculate the average and sum. Next it will ask the user to enter individual item up to declared number. Using the While Loop it will calculate the sum and later it will calculate the average.

#include<stdio.h>

void main()
{
  int n, numbers, i=0,Sum=0;
  float Average;

  printf("\nPlease Enter How many Number you want?\n");
  scanf("%d",&n);

  printf("\nPlease Enter the elements one by one\n");
  while(i<n)
   {
     scanf("%d",&numbers);
     Sum = Sum +numbers;
     i++;
   }

  Average = Sum/n;

  printf("\nSum of the %d Numbers = %d",n, Sum);
  printf("\nAverage of the %d Numbers = %.2f",n, Average);

  return 0;
}

OUTPUT:

Analysis:
First printf statement will ask the user to enter n value. For example If the user enters 5 then,second printf statement will ask the user to enter those 5 values one after the other.

While loop will resist the user, not to enter more than 2 values by using the condition i<n.
In the next line we added the entered value to sum.
After completing this, the value of i is increment by the Increment operator.

Now it will start the second iteration. For the 3rd iteration the condition (i<n) will fail so, it will exit from the loop.

C Program to find Sum and Average of n Number using Do While Loop

This program allows the user to enter the number (n) he wish to calculate the average and sum. Next it will ask the user to enter individual item up to declared number. Using the Do While Loop it will calculate the sum and later it will calculate the average.

#include<stdio.h>

void main()
{
  int n, numbers, i=0,Sum=0;
  float Average;

  printf("\nPlease Enter How many Number you want?\n");
  scanf("%d",&n);

  printf("\nPlease Enter the elements one by one\n");
  do
   {
     scanf("%d",&numbers);
     Sum = Sum +numbers;
     i++;
   }while(i<n);

  Average = Sum/n;

  printf("\nSum of the %d Numbers = %d",n, Sum);
  printf("\nAverage of the %d Numbers = %.2f",n, Average);

  return 0;
}

OUTPUT

We just replaced the While loop with the Do While loop. Please don’t forget to miss the semi-colon after the while condition.

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