Function in C

 USING FUNCTION

 1. Program to calculate factorial of number using function.

#include<stdio.h>
#include<conio.h>
void fact();
void main()
{
fact();
getch();
}
void fact()
{
int n,i,fa=1;
printf("Enter the number\n");
scanf("%d",&n);
for(i=1;i<=n;i++)
{
fa=fa*i;
}
printf("%d is factorial",fa);
}

Output: 
 














2. Program for maximum of 5 number

#include<stdio.h>
#include<conio.h>
void maxi();
void main()
{
maxi();
getch();
}
void maxi()

{
    int a,b,c,d,e;
    printf("enter the value\n");
    scanf("%d %d %d %d %d",&a,&b,&c,&d,&e);
    if(a>b&&a>c&&a>d&&a>e)
    {
        printf("%d is maximum",a);
    }
    else if(b>c&&b>d&&b>e)
    {
        printf("%d is maximum",b);
    }
    else if(c>d&&c>e)
    {
        printf("%d is maximum",c);
    }
    else if(d>e)
    {
        printf("%d is maximum",d);
    }
    else
    {
        printf("%d is maximum",e);
        }
        }

Output:

3. Program to find sum of N natural number.

#include<stdio.h>
#include<conio.h>
void sum();
void main()
{
sum();
getch();
}
void sum()
{
int N,n,i;
printf("Enter the number\n");
scanf("%d",&N);
N=N*(N+1)/2;
printf("%d is required sum",N);
}
Output:

  

4. Program to calculate area of 3 circle.
     
#include<stdio.h>
#include<conio.h>
#include<math.h>
void area();
void main()
{
area();
area();
area();
getch();
}
void area()
{
int r;
float A;

printf("Enter the radius\n");
scanf("%d",&r);
A=3.14*pow(r,2);
printf("%f is required area\n",A);
}

Output:

 

5.    Program for fibonacci series using recursive function

#include<stdio.h>
#include<conio.h>
int fibo(int n);
void main()
{
int f,n;
printf("Enter the number\n");
scanf("%d",&n);
f=fibo(n) ;
printf("The fibonacci series of %d is %d",n,f);
getch();
}
int fibo(int n)
{
if(n==1)
return 0;
else if(n==2)
return 1;
else
{
return(fibo(n-1)+fibo(n-2));
}
}

Output:

6.Sum of natural number

#include<stdio.h>

#include<conio.h>

int sum(int n);

void main()

{

int n;

printf("Enter the number\n");

scanf("%d",&n);

printf("The sum is %d",sum(n));

getch();

}

int sum(int n)

{

if(n==1)

{

return 1;

}

else

{

return(n+sum(n-1));

}

}

Output:

7 Program for factorial number

#include<stdio.h>

#include<conio.h>

int fact(int n);

void main()

{

int n;

printf("Enter the number\n");

scanf("%d",&n);

printf("The factorial is %d",fact(n));

getch();

}

int fact(int n)

{

if(n==1)

{

return 1;

}

else

{

return(n*fact(n-1));

}

}

Output:

         













8. Program to count upper,lower and digits  using function.

#include <stdio.h>
#include<conio.h>
void upper();
void main()
{
upper();

getch();
}
void upper ()
{
 char str[150];
    int i;
    int  upper,lower,digit;

upper=lower=digit= 0;

    printf("Enter the string");
    gets(str );


    for (int i = 0; str[i]!= '\0';i++)
       {
        if (str[i]>=65&&str[i]<=90)
        {
        upper++;
        }

         else if(str[i]>=90&&str[i]<=122)
         {
         lower++;
         }
        else if (str[i]>= '0'&& str[i] <= '9')
         {
            digit++;
        }
        }

    printf("The upper are%d\nlower are %d\n digit are %d\n",upper,lower,digit);

             }
Output:

 9. Program to swap the number by call by value in function call.
 #include<stdio.h>
 #include<conio.h>
 void swap(int x,int y);
 void main()
 {
 int x=10,y=20;
 printf("Given value of x=%d\nGiven value of y=%d\n",x,y);
 swap(x,y);
 printf(" To be swapped value of x=%d\n To be swapped value of y=%d\n",x,y);
 getch();
 }
 void swap(int x,int y)
 {
 int temp;
 temp=x;
 x=y;
 y=temp;
 printf("Swapped value  of x=%d\n Swapped value of y=%d\n",x,y);
 }

Output:

 10. Program to swap the value by call by reference in function call.

 #include<stdio.h>
 #include<conio.h>
 void swap(int *x,int *y);
 void main()
 {
 int x=10,y=20;
 printf("Given value of x=%d\nGiven value of y=%d\n",x,y);
 swap(&x,&y);
 printf(" To be swapped value of x=%d\n To be swapped value of y=%d\n",x,y);
 getch();
 }
 void swap(int *x,int *y)
 {
 int temp;
 temp=*x;
 *x=*y;
 *y=temp;
 printf("Swapped value  of x=%d\n Swapped value of y=%d\n",*x,*y);
 }

Output:

11. Program for fibonacci series by recursive function  where first digit is 2 .

#include<stdio.h>

#include<conio.h>

int fibo(int n);

void main()

{

int f,n,i;

printf("Enter the number\n");

scanf("%d",&n);

for(i=1;i<=n;i++)

{

f=fibo(i) ;

printf("%d\t",f);

}

getch();

}

int fibo(int n)

{

if(n==1)

return 2;

else if(n==2)

return 3 ;

else

{

return(fibo(n-1)+fibo(n-2));

}

}

Output: