Learning to Program

Write a function that receives 5 integers and returns the sum, average and standard deviation of these numbers. Call this function from main() and print the results in main(). #include <stdio.h> #include <math.h> int calc ( float a , float b , float c , float d , float e , float * sum , float * avg , float * sd ) ; int main ( ) { float a , b , c , d , e , sum = 0.0 , avg = 0.0 ; float sd = 0.0 ; printf ( "Enter Five Numbers:" ) ; scanf ( "%f %f %f %f %f" , & a , & b , & c , & d , & e ) ; calc ( a , b , c , d , e , & sum , &amp; avg , & sd ) ; printf ( " \n Sum=%f" , sum ) ; printf ( " \n Average=%f" , avg ) ; printf ( " \n Standard Deviation=%f \n " , sd ) ; getchar ( ) ; return 0 ; } calc ( float a , float b , float c , float d , float e , float * sum , float * avg , float * sd ) { float Calc = 0.0 ; * sum = a + b + c + d + e ; * avg = * sum / 5.0 ; Calc +

This program seems to be rather simple. But there's one little thing to be noted in this particular program. The thing is that the function in this program returns a float. The function declaration is usually given outside main..but due to some other standards that I am following, I have prototyed it inside main..but that doesn't cause much of a difference in this simple program. Write a function which receives a float and an int from main(), finds the product of these two and returns the product which is printed through main(). #include <stdio.h> main ( ) { int i ; float j , prod ; float product ( int x , float y ) ; printf ( "Enter the i(int) and j(float):" ) ; scanf ( "%d %f" , & i , & j ) ; prod = product ( i , j ) ; printf ( "Product:%f" , prod ) ; } product ( int x , float y ) { float product ; product = x * y ; return ( product ) ; } The program can be found at: Download File.

The following program is one good example that illustrates how we can return more than one value in a function. The answer is certainly using Pointers. The following program demonstrates the method. Write a function that calculates both Area and Perimeter/ Circumference of the Circle, whose Radius is entered through the keyboard. #include <stdio.h> main ( ) { int radius ; float area , perimeter ; printf ( " \n Enter radius of a circle:" ) ; scanf ( "%d" , & radius ) ; areaperi ( radius , & area , & perimeter ) ; printf ( "Area=%f" , area ) ; printf ( " \n Perimeter=%f" , perimeter ) ; } areaperi ( int r , float * a , float * p ) { * a = 3.14 * r * r ; * p = 2 * 3.14 * r ; } // This Program exhibits the use of Call By Reference . The program can be found at: Download File.