java program is not running

import java.util.Scanner; import java.util.Random;

class MatrixMultiplication { public static void main(String args[]) { int m, n, p, q, sum = 0, c, d, k ; Random r = new Random();

Scanner in = new Scanner(System.in); System.out.println("*** Minimum dimension of Matrix must be 25 ***"); System.out.println("Enter the number of rows and columns of first matrix"); m = in.nextInt(); n = in.nextInt(); int Low = 0; int High = 30;

int first[][] = new int[m][n];

for ( c = 0 ; c < m ; c++ ) for ( d = 0 ; d < n ; d++ ) first[c][d] = r.nextInt(High-Low) + Low;

System.out.println("Enter the number of rows and columns of second matrix"); p = in.nextInt(); q = in.nextInt();

if ( n != p ) System.out.println("Matrices with entered orders can't be multiplied with each other."); else { int second[][] = new int[p][q]; int multiply[][] = new int[m][q];

for ( c = 0 ; c < p ; c++ ) for ( d = 0 ; d < q ; d++ ) second[c][d] = r.nextInt(High-Low) + Low;

long startTime = System.currentTimeMillis();

for ( c = 0 ; c < m ; c++ ) { for ( d = 0 ; d < q ; d++ ) { for ( k = 0 ; k < p ; k++ ) { sum = sum + first[c][k]*second[k][d]; }

multiply[c][d] = sum; sum = 0; } } long elapsedTime = System.currentTimeMillis() - startTime; System.out.println("Product of matrices: ");

for ( c = 0 ; c < m ; c++ ) { for ( d = 0 ; d < q ; d++ ) System.out.print(multiply[c][d]+"\t");

System.out.print(" "); }

System.out.println("Time in ms elapsed for matrix mulitplication: " + elapsedTime);

if ( m != p && n !=q) System.out.println("Matrices with entered orders can't be added with each other."); else { int tot [][]= new int[m][n]; long start = System.nanoTime(); for ( c = 0 ; c < m ; c++ ) for ( d = 0 ; d < n ; d++ ) tot[c][d] = first[c][d] + second[c][d];

long elapsed = System.nanoTime() - start;

System.out.println("Sum of entered matrices:-");

for ( c = 0 ; c < m ; c++ ) { for ( d = 0 ; d < n ; d++ ) System.out.print(tot[c][d]+"\t"); System.out.println(); } System.out.println("Time in ns elapsed for matrix addition: " + elapsed);

} } }