C Program to generate Prime Numbers

#include<stdio.h>
#include<conio.h>
void main()
{
int n,j,a=0,i;
clrscr();
printf(" Please Enter a number :");
scanf("%d",&n);
printf("\n\n");
printf("OUTPUT:\n");
printf("------");
printf("\n\n");
printf("The Prime Number series is\n");
printf("**************************");
for(j=1;j<=n;j++)
{
for(i=2;i<j;i++)
{
if(j%i==0)
{
a=1;
goto x;
}
}
if((a==0)&&(j!=1))
{
printf("\n%d",j);
}
x:
a=0;
}
getch();
}