c classification of functions

Classification of Functions

Classification - I

Main Passing Information.

Function Returning Information

Program

#include <stdio.h>

void main()

{

int add_fun(int, int);

int a, b;

printf("\nEnter Values for 'a' and 'b' : ");

scanf("%d%d", &a, &b);

printf("\nThe Addition of %d and %d = %d", a, b, add_fun(a, b));

}

int add_fun(int x, int y)

{

return(x + y);

}

Classification - II

Main Passing Information.

Function not Returning Information.

Program

#include <stdio.h>

void main()

{

void add_fun(int, int);

int a, b;

printf("\nEnter any Two Integers : ");

scanf("%d%d", &a, &b);

add_fun(a, b);

}

void add_fun(int x, int y)

{

printf("\nAddition of %d and %d = %d", x, y, x+y);

return;

}

Classification - III

Main does not Supply any Information.

Function Returns Data.

Program

#include <stdio.h>

void main()

{

int add_fun(void);

printf("is %d", add_fun());

}

int add_fun(void)

{

int x,y;

printf("\nEnter Any Two Integers : ");

scanf("%d%d", &x, &y);

printf("\nThe Addition of %d and %d ", x, y);

return(x + y);

}

Classification - IV

Main not Passing any Information

Function not Returning any Information

Program

#include <stdio.h>

void main()

{

void add_fun(void);

printf("\nCalling the Add Function...Please Wait...");

add_fun();

}

void add_fun(void)

{

int x, y;

printf("\nEnter any Two Integers : ");

scanf("%d%d", &x, &y);

printf("\nThe Addition of %d and %d = %d", x, y, x + y);

return;

}

Illustrative Examples

Function with no Parameters and no Returns a Value

Program

#include<stdio.h>

void main()

{

void div(void);

printf("\nCalling The Division Function...");

div();

}

void div(void)

{

int num, deno;

printf("\nEnter The Numerator and Denominator : ");

scanf("%d%d", &num, &deno);

if(deno == 0)

{

printf("\nFatal Error: Denominator Cannot by Zero");

deno = 1;

}

printf("\nDivision of %d by %d = %0.2f ", num, deno, (float)num / (float)deno);

return;

}

Function with Parameters and Returns a Value

Program

# include <stdio.h>

void main()

{

int num, deno;

float div(int, int);

printf("\nEnter the Numerator and Denominator : ");

scanf("%d%d", &num, &deno);

printf("\nThe division of %d by %d is %0.2f", num, deno, div(num, deno));

}

float div(int n, int d)

{

if(d == 0)

{

printf("\nFatal Error : Denominator cannot be Zero.");

d = 1;

}

return((float)n / (float)d);

}