C Program To Check Whether The Entered Number Is PRIME or NOT.

/* Program to check whether the entered number is PRIME or NOT. */

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#include<stdio.h>
#include<conio.h>
void main()
{
int a,i,count=0;
clrscr();
printf("Enter A No. : ");
scanf("%d",&a);
for(i=2;i<=a/2;i++)
    {
    if(a%i==0)
       {
        count++;
        break;
        }
    }
if(count==0&&a!=1)
  printf("\n%d Is PRIME.",a);
else
  printf("\n%d Is NOT PRIME.",a);
getch();
}

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C/C++ Program To Calculate LCM and HCM Of Two Numbers

/* C/C++ program to calculate LCM and HCM of two numbers. */

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#include<stdio.h>
#include<conio.h>
void main()
{
int a,b,c;
printf("Enter two nos : ");
scanf("%d%d",&a,&b);
c=a*b;
while(a!=b)
{
if(a>b)
   a=a-b;
else
   b=b-a;
}
printf("HCM \t= ",a);
printf("LCM \t= ",c/a);
getch();
}

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C/C++ Program To Calculate Factorial Of A Number Using RECURSION.

Before reading the program you should know what is FACTORIAL and RECURSION ????

/* C/C++ Program To Calculate Factorial Of A Number Using RECURSION */

#include<stdio.h>
#include<conio.h>
long factorial(int);   // Function Prototype
void main()
{
int number;
long fact;
clrscr();
printf("Enter a number to find
factorial : );
scanf("%d", &number);
if(number<0 >
printf("Negative numbers are not allowed.\n");
else
{
fact=factorial(num);  // Function Calling
printf("%d! = %ld\n",number,fact);
}
getch();
}

long factorial(int x)  // Function Defination
{
if (x==0)
return 1;
else
return(x* factorial(x-1));  // Function Calling Itself » Recursion
}

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