Answer Posted / paras patel

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

int divide(int x ,int y)
{
while(x>y)
{
x-=y;
}

if(x==y)
{
x=0;
}
return x;

}

void main()
{
int c,i,n;
scanf("%d",&n);
clrscr();
for( i=2;i<=n;i++)
{
if(divide(n,i)==0)
{
break;
}

}
if(i!=n)
{
printf("not prime");
}
else
{
printf("prime");
}




getch();
}

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