Java program with 2D array -

am writing program decides if number x in matrix of input n x n matrix of number stored in memory in 2d array , each individual rows increasing left right; column top bottom. enter size of matrix n, content, , number x search; display result of search in screen. while testing program input sorted in 2d array.

here code, , showing below compiling error

import java.util.*;  public class matrix {     public static void main (string[] args){          int search(int mat[4][4]; int n; int x)         {             int = 0, j = n-1;  //set indexes top right element             while ( < n && j >= 0 )             {                 if ( mat[i][j] == x )                 {                     printf("\n found @ %d, %d", i, j);                     return 1;                 }                 if ( mat[i][j] > x )                     j--;                 else //  if mat[i][j] < x                     i++;             }              printf("\n element not found");             return 0;  // if ( i==n || j== -1 )         }          // driver program test above function         int main()         {             int mat[4][4] = { {10, 20, 30, 40},                               {15, 25, 35, 45},                               {27, 29, 37, 48},                               {32, 33, 39, 50},                              };             search(mat, 4, 29);             return 0;         }     } } 

stack trace:

exception in thread "main" java.lang.error: unresolved compilation problems:      syntax error on token "(", ; expected     syntax error on token "4", delete token     syntax error on token "4", delete token     syntax error on token ")", ; expected     method printf(string, int, int) undefined type matrix     void methods cannot return value     method printf(string) undefined type matrix     void methods cannot return value     syntax error on token "int", new expected     main cannot resolved type     syntax error, insert ";" complete fielddeclaration     syntax error, insert "}" complete classbody     syntax error on token "}", delete token      @ matrix.main(matrix.java:8) 

you have search method inside main(), should outside. also, declaring main inside main() method. remember main method entry point program, , there should exist one:

public static void main(string[] args) { ... } 

in java, not supposed declare length of arrays in parameters declaration. also, use commas separate parameters:

public static int search(int[][] mat, int n, int x) 

you should use system.out.printf() instead of printf().

finally, array can declared/initialized in multiple ways:

int mat[][] = {{1,2}, {3,4}}; int mat[][] = new int[3][3]; int mat[][] = new int[3][]; 

the final code should like:

public static int search(int[][] mat, int n, int x) {     int = 0, j = n - 1; //set indexes top right element     while (i < n && j >= 0) {         if (mat[i][j] == x) {             system.out.printf("\n found @ %d, %d", i, j);             return 1;         }         if (mat[i][j] > x) {             j--;         } else {             i++;         }     }      system.out.printf("\n element not found");     return 0; // if ( i==n || j== -1 ) }  public static void main(string[] args) {     int mat[][] = { { 10, 20, 30, 40 }, { 15, 25, 35, 45 }, { 27, 29, 37, 48 }, { 32, 33, 39, 50 }, };     search(mat, 4, 29); }