Lagrange interpolation in JAVA -

i have done search around, there isnt code available in java hence have write own , have encountered issue. got code c++ source , trying hard convert workable java program.

http://ganeshtiwaridotcomdotnp.blogspot.sg/2009/12/c-c-code-lagranges-interpolation.html

public static void main(string[] args) {      int n;     int i, j;     int a;     int x[] = null;     int f[] = null;     int sum = 0;     int mult;     scanner input = new scanner(system.in);     system.out.println("enter number of point: ");     n = input.nextint();      system.out.println("enter value x calculation: ");     = input.nextint();      (i = 0; < n; i++) {          system.out.println("enter values of x , corresponding functional vale: ");         x = input.nextint();         f = input.nextint();     }      (i = 0; <= n - 1; i++) {         mult = 1;         (j = 0; j <= n - 1; j++) {              if (j != i) {                 mult *= (a - x[j]) / (x[i] - x[j]);              }             sum += mult * f[i];         }      }     system.out.println("the estimated value of f(x)= " + sum);  } 

int x[] = null; int f[] = null; ... (i = 0; < n; i++) {     ....     x = input.nextint();     f = input.nextint(); } 

looks clear enough. create array instance x , f:

x = new int[n]; f = new int[n]; 

somewhere after:

n = input.nextint(); 

before above for loop, , modify for body:

... x[i] = input.nextint(); f[i] = input.nextint();