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C program to check prime or not prime no ( C program Coding )

Coding-
#include<stdio.h>
#include<conio.h>
void main()
{
 int a,b,n;
printf("Enter the numbers=");
scanf("%d",&n);
if(a=2;a<=n-1;a++);
{
if(n%a==0)
Break;
}
if(a==0)
printf("\n Prime number");
else
printf("\n Not prime number");
getch();
}

 OUTPUT-
Enter any number=21
a prime number
Enter any number=8
not a prime number
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