Newton Forward Interploation (Numerical Methods)

// Newton Foward interpolation
#include<stdio.h>
#include<conio.h>
int main()
{
  int i,j,num;
  float data[10][10],u,abc,x,ch1,ch=1;
  printf("\n *** Welcome to the calculation in Newton Forward Interpolation ***");
  printf("\n\n Enter the number of values do u wanna Enter:\n Enter Your Choice:");
  scanf("%d",&num);
  for(i=0;i<num;i++)
  {
  printf("\n Enter  data value x(%d) is:",i+1);
  scanf("%f",&data[i][0]);
  }
  for(i=0;i<num;i++)
  {
  printf("\n Enter function value y(%d)is:",i+1);
  scanf("%f",&data[i][1]);
  }
  for(j=2;j<num+1;j++)
  {
   for(i=0;i<num-1;i++)
   {
   data[i][j]=((data[i+1][j-1])-(data[i][j-1]));
   }
  }
   printf("\n The Forward difference Table is:");
   printf("\n x            f(x)");
   for(i=0;i<num;i++)
   {
   printf("       %dDD  ",i);
    // if(i==4)
    // break;
   }
   for(i=0;i<num;i++)
   {
    printf("\n");
    for(j=0;j<num+1-i;j++)
    {
    printf(" %f",data[i][j]);
    }
     }
    printf("\n\n Enter the value of x:\n Enter Your Choice:");
    scanf("%f",&x);
    abc=((data[1][0])-(data[0][0]));
    u=(x-data[0][0])/abc;
    ch1=data[0][1];
    for(i=1;i<num;i++)
    {
    ch=ch*((u-(i-1))/i);
    ch1=ch1+(data[0][i+1])*(ch);
    }
    printf("\n\n\t Hence The value at the function at x=%f is =%f",x,ch1);
    printf("\n\n\t\t\t *** Bye Bye ***");
  getch();
  return 0;
}
Garry