Program 12 Using While loop

The number which has only two factors then the number is called as a Prime number.

(or)

A prime number is a whole number greater than 1, whose only two whole-number factors are 1 and itself. The first few prime numbers are 2, 3, 5, 7, 11, 13, 17, 19, 23, and 29.

#include<stdio.h> #include<conio.h> void main()        {                int n,i,fc=0;                clrscr();                printf("enter a number:");                scanf("%d",&n);                i=1;                while(i<=n)                       {                            if(n%i==0)                            fc++;                            i++;                       }               if(fc==2)               printf("the number is prime number:");               else               printf("the number is not prime number:");               getch();       }

Output:-

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