Pattern Of Stars In C and C++

//Pattern Of Stars

#include<stdio.h>
#include<math.h>
main()
{
   int i,j,num,a[10];
 printf("Enter Number Of Stars You Want");

 scanf("%d",&num);
 for(i=-1;i<=num;i++)
 {
  i++;
 for(j=0;j<=i;j++)
 {
 printf("*");

  
}
  printf("\n"); 
}
}