C Program to Find the Average and Sum of Numbers Until 0 is Entered

C programs to find the sum and average of the numbers until 0 is entered, are given here. Suppose the input numbers are 5, 10, 9, 0, then the sum = (5 + 10 + 9) = 24 and average = (5 + 10 + 9) / 3 = 8.

Page content(s):

1. Algorithm

2. Pseudocode

3. Time Complexity

4. Program & output:

 4.1. Iterative approach

 4.2. Recursive approach

1. Algorithm to find the sum and average of the numbers until 0 is entered

1. Set sum = 0, count = 0.

2. Take a number n as input.

3. Perform sum = sum + n.

4. Check if n = 0

5. If step 4 is true declare sum and as the sum and (sum / count) as the average of the numbers entered.

6. If step 4 is false, perform count = count + 1 and go to step 2

2. Pseudocode to find the sum and average of the numbers until 0 is entered

1. Procedure sumAverage():

2. sum := 0

3. count := 0

4. n := Input()

5. Repeat until n = 0

6. sum := sum + n

7. count := count + 1

8. n := Input()

9. avg := (sum / count)

10. Return sum, avg

11. End Procedure

3. Time complexity to find the sum and average of the numbers until 0 is entered

Time Complexity: O(n)

Here n is the number of terms.

4. Program to find the sum and average of the numbers until 0 is entered

4.1. C Program to find the sum and average of the numbers until 0 is entered using iteration

Code has been copied

/********************************
	alphabetacoder.com
C program to find average and sum
of numbers until 0 is entered
*********************************/

#include <stdio.h>

int main() {
    // declare variables
    int n, count, sum;

    // initialize
    sum = 0;
    count = -1;

    // keep taking input 
    // until 0 is entered
    do {
        // take input
        printf("Enter a number: ");
        scanf("%d", & n);

        // add to sum
        sum = sum + n;

        // increment the value of number count
        count++;

    } while (n != 0);

    // display the sum and average
    printf("\nTotal number entered: %d\n", count);
    printf("Sum: %d\n", sum);
    printf("Average: %lf\n", (double) sum / count);

    return 0;
}

Output

Enter a number: 8

Enter a number: 3

Enter a number: 5

Enter a number: -4

Enter a number: 3

Enter a number: 1

Enter a number: 0

Total number entered: 6

Sum: 16

Average: 2.666667

4.2. C Program to find the sum and average of the numbers until 0 is entered using recursion

Code has been copied

/*******************************************
	      alphabetacoder.com
C program to find sum and average of 
numbers until 0 is entered using recursion
********************************************/

#include <stdio.h>

void findSumAverage(int sum, int count) {
    // take input
    int n;
    printf("Enter a number: ");
    scanf("%d", & n);

    // keep taking input 
    // until 0 is entered
    if (n == 0) {
        printf("\nTotal numbers entered: %d\n", count);
        printf("Sum: %d\n", sum);
        printf("Average: %lf\n", (double) sum / count);
    } else {
        // add input to sum and increment count
        sum += n;
        count++;
        findSumAverage(sum, count); // recursive call
    }
}

int main() {
    // declare and initialize variables
    int sum = 0, count = 0;

    // call function to display result
    findSumAverage(sum, count);

    return 0;
}

Output

Enter a number: 1

Enter a number: 3

Enter a number: 5

Enter a number: 0

Total number entered: 3

Sum: 9

Average: 3.000000