C Program & Algorithm to check whether the given number is Prime or not

This is the C program code and algorithm for checking whether the given number is prime or not.

Aim:

Write a C program to check whether the given number is prime or not.

Algorithm to check whether the given number is Prime or not

Algorithm:

Step 1: Start
Step 2: Read number n
Step 3: Set f=0
Step 4: For i=2 to n-1
Step 5: If n mod 1=0 then
Step 6: Set f=1 and break
Step 7: Loop
Step 8: If f=0 then
         print 'The given number is prime'
        else
         print 'The given number is not prime'
Step 9: Stop

Program code

#include<stdio.h>
#include<conio.h>

void main( )
{
clrscr();
int n,i,f=0;
printf("Enter the number: ");
scanf("%d",&n);
for(i=2;i<n;i++)
{
  if(n%i==0)
   {
     f=1;
     break;
   }
}

if(f==0)
   printf("The given number is prime");
else
   printf("The given number is not prime");
getch();
}

Output

Enter the number : 5

The given number is prime

 

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