Function Maximum and Minimum

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Write a program that asks a user to input 3 separate integer, the program reads it and determines the maximum and minimum integer.


Understanding Functions
Modules in C are called functions. C programs are typically written by combining new functions you write with prepackaged functions available in the C standard library.
The C standard library provides a rich collection of functions for performing common mathematical calculations, string manipulations, character manipulations, input/output, and many other useful operations. This makes your
job easier, because these functions provide many of the capabilities you need.
Functions are invoked by a function call, which specifies the function name and provides information (as arguments) that the function needs to perform its designated task. for more on functions click here
Solution

/*Finding the maximum/minimum of three integers */

#include<stdio.h>


int maximum(int x,int y, int z);

int minimum(int x, int y, int z);

 /*function main begins program execution */

int main(void)

{
/*Initialization phase */
    int num1; // first integer entered by the user

    int num2; // second integer entered by the user

    int num3; // third integer entered by the user

 /*Processing phase */

    printf("Enter Three digits integers to know the maximum/minimum:"); /*Prompting for input */

    scanf("%d%d%d", &num1,&num2,&num3); /*reading grade from user */


// number1, number2 and number3 are arguments
// to the maximum and minimum function call

    printf("\nMAXIMUM IS:%d\n", maximum(num1,num2,num3)); /*displaying result */

    printf("\nMINIMUM IS:%d\n", minimum(num1,num2,num3)); /*displaying result */


     return 0; /* indicates that program ended successfully */ 

}

// Function maximum definition
// x, y and z are parameters


int maximum(int x, int y, int z)

{

    int max=x; /*assume x is the largest integer */

    if(y>max){

        max=y;

    }

    if(z=max){

        max=z;

    }

    return max;
}
// Function minimum definition
// x, y and z are parameters
int minimum(int x, int y, int z)

{
    int min=x;/*assume x is the smallest */

    if(y<min){

        min=y;

    }

    if(z<min){

        min=z;

    }
}
Explanation of the program

Our program above uses a programmer-defined function maximum and minimum to determine and return the largest and smallest of three integers .
The integers are input with scanf. (scanf("%d%d%d", &num1,&num2,&num3);)
Next, they’re passed to maximum and minimum, which determines the largest and smallest integer.  printf("\nMAXIMUM IS:%d\n", maximum(num1,num2,num3));
                               printf("\nMINIMUM IS:%d\n", minimum(num1,num2,num3)); 
This value is returned to main by the return statement in maximum and minimum. The value returned is then printed in the printf statement .

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