I have error in Sudoku Solver in java

#include <stdio.h>
  
int grid[9][9];
  
void print_solution(void)
{
  static int nsol = 0;
  int r, c;
  
  printf("----- solution %d -----\n", ++nsol);
  for (r = 0; r < 9; r++)
  {
    for (c = 0; c < 9; c++)
    {
      printf("%d", grid[r][c]);
      if (c % 3 == 2) printf("  ");
    }
    printf("\n");
    if (r % 3 == 2) printf("\n");
  }
  
}
  
int safe(int row, int col, int n)
{
  int r, c, br, bc;
  
  if (grid[row][col] == n) return 1;
  if (grid[row][col] != 0) return 0;
  for (c = 0; c < 9; c++)
    if (grid[row][c] == n) return 0;
  for (r = 0; r < 9; r++)
    if (grid[r][col] == n) return 0;
  br = row / 3;
  bc = col / 3;
  for (r = br * 3; r < (br + 1) * 3; r++)
    for (c = bc * 3; c < (bc + 1) * 3; c++)
      if (grid[r][c] == n) return 0;
  
  return 1;
}
  
void solve(int row, int col)
{
  int n, t;
  
  if (row == 9)
    print_solution();
  else
    for (n = 1; n <= 9; n++)
      if (safe(row, col, n)) {
    t = grid[row][col];
    grid[row][col] = n;
    if (col == 8)
      solve(row + 1, 0);
    else
      solve(row, col + 1);
  
    grid[row][col] = t;
      }
}
  
int
main()
{
  int i, j;
  
  printf("enter the sudoku: \n");
  for(i=0;i<9;i++)
    for(j=0;j<9;j++)
    {
      printf("(%d, %d): ", i+1, j+1);
      scanf("%d", &grid[i][j]);
    }
  solve(0,0);
  return 0;
}

import java.util.*;
import java.io.*;

class puzzle
{
  
  public static void main(String[] args)
  {
   int[][] grid = new int[9][9];
   int i, j;
   Scanner in = new Scanner(System.in);
   System.out.println("Enter the Values :");
 
     for(i=0;i<9;i++)
      for(j=0;j<9;j++)
       {
        System.out.print(i+1+","+ j+1);
        
        grid[i][j]=in.nextInt();

       }
   solve(0,0);
   return 0;

  }

void print_solution()
{
  
  static int nsol = 0;
  int r, c;
  System.out.println("----- solution"+ ++nsol + " -----\n");
  for (r = 0; r < 9; r++)
  {
    for (c = 0; c < 9; c++)
    {
     System.out.print(grid[r][c]);
      
      if (c % 3 == 2) 
      System.out.print("  ");
    }
    System.out.println();
    if (r % 3 == 2) 
    System.out.println();
  }
  
}
  
int safe(int row, int col, int n)
{
  int r, c, br, bc;
  
  if (grid[row][col] == n) 
  return 1;
  
  if (grid[row][col] != 0) 
  return 0;
  
  for (c = 0; c < 9; c++)
    if (grid[row][c] == n) 
    return 0;
  
  for (r = 0; r < 9; r++)
    if (grid[r][col] == n) 
    return 0;
  
  br = row / 3;
  bc = col / 3;
  for (r = br * 3; r < (br + 1) * 3; r++)
    for (c = bc * 3; c < (bc + 1) * 3; c++)
      if (grid[r][c] == n) return 0;
  
  return 1;
}
  
void solve(int row, int col)
{
  int n, t;
  
  if (row == 9)
    print_solution();
  else
    for (n = 1; n <= 9; n++)
      if (safe(row, col, n)) {
    t = grid[row][col];
    grid[row][col] = n;
    if (col == 8)
      solve(row + 1, 0);
    else
      solve(row, col + 1);
  
    grid[row][col] = t;
      }
}
}