In this article, we will write a C program to calculate the average of 3 numbers using function. The program takes three numbers from the user as input, calculates their average and prints the result on the output window.
Sample Example:
Enter three numbers: 10 20 30
Average of 10, 20 and 30 is: 20.000000
Enter three numbers: 5 2 7
Average of 5, 2 and 7 is: 4.666667To calculate the average of three numbers using a user-defined function, we have to create a function that takes the three numbers as argument, calculates their average and returns the result.
As the average of three numbers can be an integer or a float value, therefore, we will keep the return type of the function a float which will take care of both integer and decimal point numbers. A float value is nothing but a decimal point value.
See implementation in the following program:
// C program to find the average
// of three numbers using a function
#include <stdio.h>
// Function declaration
float average(int, int, int);
int main() {
int num1, num2, num3;
float avg;
printf("Enter three numbers: ");
scanf("%d %d %d", &num1, &num2, &num3);
// Get average using average() function
avg = average(num1, num2, num3);
printf("Average of %d, %d and %d is: %f", num1, num2, num3, avg);
return 0;
}
// Function to calculate average of three numbers
float average(int x, int y, int z){
float avg;
avg = (x + y + z)/3.0;
return avg;
}
Output:
Enter three numbers: 20 30 40 Average of 20, 30 and 40 is: 30.000000 Enter three numbers: 10 11 11 Average of 10, 11 and 11 is: 10.666667
Program Explanation:
- The program begins with the declaration of a function called
average(), which takes three integer parameters (x, y, and z) and returns a floating-point value (avg). - This function is declared before the
main()function to inform the compiler about its existence. - Variables
num1,num2, andnum3are used to store user-input numbers and a floating-point variableavgto store the calculated average. - To calculate the average of the three input numbers, the
average()function is called inside the main() function with the values of num1, num2, and num3 as arguments. - The result is stored in the
avgvariable. - Finally, the program uses
printf()to display the calculated average along with the input values.
That’s all for this article. Thanks for reading!
