User Define Function Programs

Program using User Define Function to find sum of three numbers.
#include<stdio.h>
#include<conio.h>
void main()
{
     int a,b,c,s;
      //Function Declaration
     int sum(int a,int b,int c);
     clrscr();
     printf("Enter value of a:");
     scanf("%d",&a);
     printf("Enter value of b:");
     scanf("%d",&b);
     printf("Enter value of c:");
     scanf("%d",&c);
     s=sum(a,b,c);
      //Function Call
     printf("Sum=%d",s);
     getch();
}
//Function Definition
int sum(int a, int b, int c)
{
     return (a+b+c);
} 
Output
Enter value of a: 2
Enter value of b: 5
Enter value of c: 3
Sum = 10
Program using User Define Function to find average of three numbers.
#include<stdio.h>
#include<conio.h>
void main()
{
     float a,b,c;
     float ag;
      //Function Declaration
     float avg(float a,float b,float c);
     clrscr();
     printf("Enter value of a:");
     scanf("%f",&a);
     printf("Enter value of b:");
     scanf("%f",&b);
     printf("Enter value of c:");
     scanf("%f",&c);
     //Function Call
    ag=avg(a,b,c); 
    printf("Average=%f",ag);
    getch();
}
//Function Definition
float avg(float a, float b, float c)
{
     return (a+b+c)/3;
}
Output
Enter value of a: 2
Enter value of b: 5
Enter value of c: 3 
Average = 3.333333
     
Program using User Define Function to find maximum from two numbers.
#include<stdio.h>
#include<conio.h>
void main()
{
     int a,b,m;
      //Function Declaration
     int max(int a,int b);
     clrscr();
     printf("Enter value of a:");
     scanf("%d",&a);
     printf("Enter value of b:");
     scanf("%d",&b);
     //Function Call
    m=max(a,b); 
    printf("max=%d",m);
    getch();
}
//Function Definition
int max(int a,int b)
{
     if (a>b)
     return a;
     else
     return b;
}
Output
Enter value of a: 35
Enter value of b: 45
max = 45
Program using User Define Function to find maximum from three numbers.
#include<stdio.h>
#include<conio.h>
void main()
{
     int a,b,c,m;
      //Function Declaration
     int min(int a,int b,int c);
     clrscr();
     printf("Enter value of a:");
     scanf("%d",&a);
     printf("Enter value of b:");
     scanf("%d",&b);
     printf("Enter value of c:");
     scanf("%d",&c);
     //Function Call
    m=min(a,b,c); 
    printf("Minimum=%d",m);
    getch();
}
//Function Definition
int min(int a,int b,int c)
{
    if ((a<,b)&&(a<,c))
    return a;
    else if((b<,a)&&(b<,c))
    return b;
    else
    return c;
}
Output
Enter value of a: 2
Enter value of b: 5
Enter value of c: 3
Minimum:2
Program using User Define Function to find factorial of given number (Use Recusrsion).
#include<stdio.h>
#include<conio.h>
void main()
{
     int n,f;
      //Function Declaration
     int factorial(int n);
     clrscr();
     printf("Enter value of n:");
     scanf("%d",&n);
      //Function Call
     f=factorial(n); 
     printf("Factorial=%d",f);
     getch();
}
//Function Definition
int factorial(int n)
{
     int fact;
     if (n==1)
     return 1;
     else
     fact=n*factorial(n-1);
     return fact;
}
Output 
Enter value of n: 4
Factorial=24
Program using User Define Function to find power of given number.
#include<stdio.h>
#include<conio.h>
void main()
{
     int x,n,p;
      //Function Declaration
     int power(int x,int n);
     clrscr();
     printf("Enter value of x:");
     scanf("%d",&x);
     printf("Enter value of n:");
     scanf("%d",&n);
     //Function Call
    p=power(x,n);
    printf("Power=%d",p);
    getch();
}
//Function Definition
int power(int x,int n)
{
     int p=1,i;
     for(i=1;i<=n;i++)
     p=p*x;
     return p;
}
Output
Enter Value of x:2
Enter Value of n:3
Power=8

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