In this tutorial, i am going to show you how to find or calculate sum and average of an array in c program.

## Algorithm to Find Sum and Average of an Array

Follow the below given algorithm to write a program to find sum and average of an array of numbers; as follows:

- Start Program
- Define array, avg, sum, i and n variables.
- Take input size of array and store into to the variable.
- Iterate for loop to take array elements as input, and print them.
- Iterate for loop to access each element of array to get the sum of all the elements.
- The average is calculated by dividing the overall sum to the number of elements in the array.
- Sum and average are printed on the screen.
- End Program.

## C Program to Find Sum and Average of an Array

#include<stdio.h> int main() { float a[100], sum=0, avg; int i, n; printf("Plesae Enter Size of An Array : "); scanf("%d", &n); /* Reading array */ printf("Enter array elements or numbers:\n"); for(i=0; i< n; i++) { printf("Enter element a[%d] = ", i); scanf("%f", &a[i]); } /* Finding sum */ for(i=0; i< n; i++) { sum = sum + a[i]; } /* Calculating average */ avg = sum/n; /* Displaying Result */ printf("Sum is %f\n", sum); printf("Average is %f", avg); return 0; }

The result of the above c program; as follows:

Plesae Enter Size of An Array : 4 Enter array elements or numbers: Enter element a[0] = 10 Enter element a[1] = 20 Enter element a[2] = 30 Enter element a[3] = 40 Sum is 100.000000 Average is 25.000000

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