C Exercises: Calculate and print average of the stream of given numbers

Last update on May 27 2022 12:19:25 (UTC/GMT +8 hours)

C Programming Mathematics: Exercise-21 with Solution

Write a C program to calculate and print average (or mean) of the stream of given numbers.

Example 1:
Input:
arr[] = {10, 20, 30, 40, 50, 60, 70, 80, 90, 100}
Output:
Average of 1 numbers is 10.000000
Average of 2 numbers is 15.000000
Average of 3 numbers is 20.000000
Average of 4 numbers is 25.000000
Average of 5 numbers is 30.000000
Average of 6 numbers is 35.000000
Average of 7 numbers is 40.000000
Average of 8 numbers is 45.000000
Average of 9 numbers is 50.000000
Average of 10 numbers is 55.000000

Pictorial Presentation:

$C Exercises: Calculate and print average of the stream of given numbers$

Sample Solution:

C Code:

#include <stdio.h>
#include <stdlib.h>

void streamAvg(float arr[], int arr_size) 
    { 
		float avg = 0; 
		int i = 0;
		while(i<arr_size)
        { 
			avg = (avg * i + arr[i]) / (i + 1);
            printf("\nAverage of %d numbers is %f \n", i + 1, avg); 
         i++;
        } 
        return; 
    } 
   
    int main(void)
     { 
        float arr[] = {10, 20, 30, 40, 50, 60, 70, 80, 90, 100};
		int arr_size = sizeof(arr) / sizeof(arr[0]); 
		printf("\nElements in array are: ");  
        int i=0;
		while(i<10)  
        {  
        printf("%f  ", arr[i]);  
        i++;
        } 
        streamAvg(arr, arr_size); 
		return 0;
     }

Sample Output:

Elements in array are: 10.000000  20.000000  30.000000  40.000000  50.000000  60.000000  70.000000  80.000000  90.000000  100.000000  
Average of 1 numbers is 10.000000 

Average of 2 numbers is 15.000000 

Average of 3 numbers is 20.000000 

Average of 4 numbers is 25.000000 

Average of 5 numbers is 30.000000 

Average of 6 numbers is 35.000000 

Average of 7 numbers is 40.000000 

Average of 8 numbers is 45.000000 

Average of 9 numbers is 50.000000 

Average of 10 numbers is 55.000000

Flowchart:

$Flowchart: Calculate and print average of the stream of given numbers.$

C Programming Code Editor:

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C Programming: Tips of the Day

Static variable inside of a function in C

The scope of variable is where the variable name can be seen. Here, x is visible only inside function foo().

The lifetime of a variable is the period over which it exists. If x were defined without the keyword static, the lifetime would be from the entry into foo() to the return from foo(); so it would be re-initialized to 5 on every call.

The keyword static acts to extend the lifetime of a variable to the lifetime of the programme; e.g. initialization occurs once and once only and then the variable retains its value - whatever it has come to be - over all future calls to foo().

Ref : https://bit.ly/3fOq7XP