loops examples

FACTORIAL OF A NUMBER:

#include<conio.h>

#include<stdio.h>

int factorial(int);

 int main()

{

 //clrscr();

 int a,fact;

 

 printf("Enter the number:");

 scanf("%d",&a);

 fact=factorial(a);

 printf("\nFactorial of a number: %d",fact);

 getch();

 return 0;

}

 int factorial(int x)

 {

    int f=1,i;

    for(i=x;i>=1;i--)

     {

      f=f*i;

     }

    return(f);

 }

CALL BY VALUE AND REFERENCE:

#include<conio.h>

#include<stdio.h>

void swap(int *,int *);

main()

{

int a=10,b=20;

clrscr();

printf("Before function call, Value of a= %d and b= %d",a,b);

swap(&a,&b);

printf("\n\nAfter function call, Value of a= %d and b= %d",a,b);

getch();

}

void swap(int *x,int *y)

{

 int t;

 t=*x;

*x=*y;

 *y=t;

 printf("\n\nWithin the function, Value of x =%d and y= %d",*x,*y);

}

SWITCH CASE:

#include<conio.h>

#include<stdio.h>

main()

{

 int a;

 clrscr();

 printf("Enter a number:");

 scanf("%d",&a);

 switch(a)

 {

  case 1:

     printf("Day is monday");

     break;

  case 2:

  printf("Day is tuesday");

  break;

  case 3:

      printf("Wed");

      break;

  default:

     printf("not a valid option");

     }

     getch();

     }

PRIME NUMBER:

#include<conio.h>

#include<stdio.h>

main()

{

clrscr();

int p,flag=0;

printf("Enter a number:");

scanf("%d",&p);

for(int i=2;i<=p/2;i++)

  {

    if(p%2==0)

    {

     flag=1;

     break;

    }

 }

 if(flag==1)

  printf("Number is not a prime");

 else

   {

    printf("Number is prime");

   }

   getch();

   }

EXAMPLE 2; SWITCH CASE;

#include<conio.h>

#include<stdio.h>

main()

{

 int a,b,c,q;

 clrscr();

 printf("Enter the value of a and b:");

 scanf("%d%d",&a,&b);

 printf("1.Addition\n");

 printf("2.Subtraction\n");

 printf("3.Divide\n");

 printf("4. Multiplication\n");

 printf("Enter number...which you want to do:-");

 scanf("%d",&q);

 switch(q)

 {

  case 1:

c=a+b;

printf("Addition is: %d",c);

break;

  case 2:

c=a-b;

printf("\nSub is :%d",c);

break;

   case 3:

c=a/b;

printf("\nDivision is :%d",c);

break;

    case 4:

c=a*b;

printf("\nMultiplication is :%d",c);

break;

    default:

printf("Not a valid option") ;

    }

    getch();

    }

TO PRINT  ENGLISH ALBHABETS

#include<conio.h>

#include<stdio.h>

main()

{

int a;

clrscr();

printf("\nTo print the alphabets using ASCII values\n");

for(a=65;a<=90;a++)

 {

  printf("%c ",a);

 }

 getch();

 }

SUM OF DIGITS;

#include<conio.h>

#include<stdio.h>

main()

{

clrscr();

int a,n,sum=0;

printf("Enter a number:");

scanf("%d",&a);

while(a!=0)

{

 n=a%10;

 a=a/10;

 sum=sum+n;

}

printf("\nSum of the digits: %d",sum);

getch();

}

REVERSE OF A NUMBER

#include<conio.h>

#include<stdio.h>

main()

{

 int a,rev=0,n;

 clrscr();

 printf("Enter the value of a number:");

 scanf("%d",&a);

 while(a!=0)

 {

   n=a%10;

   a=a/10;

   rev=rev*10+n;

 }

 printf("Reverse Number is: %d",rev);

 getch();

 }

ARMSTRONG OF ANUMBER;

#include<conio.h>

#include<stdio.h>

#include<math.h>

main()

{

clrscr();

int a,n,b,sum=0;

printf("Enter a number:");

scanf("%d",&a);

b=a;

while(a!=0)

{

 n=a%10;

 n=pow(n,3);

 a=a/10;

 sum=n+sum;

 }

if(sum==b)

 printf("\nNumber is an armstrong number");

else

 printf("\nNumber is not an armstrong number");

getch();

}

MULTIPLICATION

#include<conio.h>

#include<stdio.h>

main()

{

clrscr();

int a,n,mul=1;

printf("Enter a number:");

scanf("%d",&a);

while(a!=0)

{

 n=a%10;

 a=a/10;

 mul=mul*n;

 }

 printf("\nMultipliaction: %d",mul);

 getch();

 }

FIBANOCI SERIES:

#include<conio.h>

#include<stdio.h>

main()

{

clrscr();

int a=0,b=1,c,n=2;

printf("%d  %d  ",a,b);

while(n<10)

{

 c=a+b;

 printf("%d  ",c);

 a=b;

 b=c;

 n++;

 }

 getch();

 }