Factorial Program!!

This program computes the factorial of the given number and displays it. The control structure 'for' is used to determine the factorial. When there is a number of iteration is carried out till a desired output or condition is solved , we go for the 'for' statement.

LOGIC:
 Factroial of 'n' is denoted as 'n!' 

 

PROGRAM:
#include<stdio.h>
#include<conio.h>
void main()
{
int i,j,n;
j=1;
clrscr();
printf("Enter the n value:");
scanf("%d",&n);
for(i=1;i<=n;i++)
{
j=j*i;
}
printf("\n Factorial of %d is :%d",n,j);
getch();
}

Choices Program!!

This Program mainly illustrates the use of 'Switch" control structure. When there are varied number of options and when we have to select 1 option , 'switch' is used.

We first get the values of 2 numbers and enter our choice to add,subtract,multiply or divde the numbers.

Important points to remember while using 'switch':

• The value that is being switched must be an integer [x in this program].
• There must be a space between the 'case' ant the no. [case 1:]
• Every caes must end up with the 'break'.
• 'default' is mandatory. 'break' is not necessary for default.

 PROGRAM:

#include<stdio.h>
#include<conio.h>
void main()
 {
  int a,b,x;
  float c;
  clrscr();
  printf("Enter A:");
  scanf("%d",&a);
  printf("Enter B:");
  scanf("%d",&b);
  printf("\n");
  printf("1 - Add\n2 - Subtract\n3 - Multiply\n4 - Divide\n");
  printf("Enter your choice:");
  scanf("%d",& x);
  switch(x)
   {
    case 1: c=a+b;
        printf("The Sum is:%f",c);
        break;
    case 2: c=a-b;
        printf("The difference is:%f", c);
        break;
    case 3: c=a*b;
        printf("The Product is:%f", c);
        break;
    case 4: c=a/b;
        printf("The Quotient is:%f",c);
        break;
    default: printf ("Invalid option");
   }
  getch();
 }
 

Leap Year Program!!

This program determines whether the given year is a leap year or not.This problem also illustrates the use of the control statemen if-else!!

LOGIC:
If the year is divisible by 4 it is a leap year.
If the year is divisible by 100 it is not a leap year.
If the year is divisible by 400 it is a leap year.

PROGRAM:

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

{
 int year;
 clrscr();
 printf("Enter the year:");
 scanf("%d",&year);

 if(year%100==0)
 {
   if(year%400==0)
  {
   printf("%d Is a leap year",year);
   }
 else
  {
   printf("%d Is a non-leap year",year);
   }
   }
  else
  {
   if(year%4==0)
  {
   printf("%d: It is a leap year",year);
   }
   else
  {
   printf("%d: It is not a leap year",year);
   }
  }
 printf("\n~!Anyway have a nice year!~");
 getch();

}