**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.

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## 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

/******************************** 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

/******************************************* 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