Matrix

//Matrix
import java.util.Scanner; 
public class matrix 
{ static void getmat(int[][] mat,int r,int c) 
{ 
Scanner s=new Scanner(System.in);
int i,j;
for(i=0;i<r;i++) 
{ for(j=0;j<c;j++) mat[i][j]=s.nextInt(); 
} } 
static void multiplication(int [][]mat1,int[][] mat2,int mat3[][],int r1,i 
nt c1,int r2,int c2) 
{ int i,j,k; for(i=0;i<r1;i++) 
{ for(j=0;j<c2;j++) 
{ int sum=0; for(k=0;k<c1;k++) sum+=(mat1[i][k]*mat2[k][j]); 
mat3[i][j]=sum; 
} 
} } static void addition(int[][] A,int[][] B,int[][] C,int r,int c) 
{ for(int i=0;i<r;i++) 
{ for(int j=0;j<c;j++) 
C[i][j]=A[i][j]+B[i][j]; 
} } static void printmat(int[][] mat,int r,int c) 
{ int i,j; for(i=0;i<r;i++) 
{ for(j=0;j<c;j++) 
System.out.print(mat[i][j]+" "); 
System.out.println(); 
} } public static void main(String args[]) 
{ 
Scanner s=new Scanner(System.in); 
int r1,c1,r2,c2,result; 
System.out.println("Enter the no. of rows of matrix 1 :"); 
r1=s.nextInt(); 
System.out.println("Enter the no. of columns in matrix 1:"); 
c1=s.nextInt(); 
System.out.println("Enter the no. of rows of matrix 2 :");
r2=s.nextInt(); 
System.out.println("Enter the no. of columns in matrix 2 :"); 
c2=s.nextInt(); int A[][]=new int[r1][c1]; int B[][]=new int[r2][c2]; 
System.out.println("Enter the matrix 1 :"); 
getmat(A,r1,c1); 
System.out.println("Enter the matrix 2 :");
getmat(B,r2,c2); 
System.out.println("Enter choice : 1. Add 2. Multiply");
int ch=s.nextInt(); if(ch==1) 
{ if(r1==r2 && c1==c2) 
{ 
 	int C[][]=new int[r1][c1];  	
addition(A,B,C,r1,c1); 
 
 	System.out.println("Result mat: ");  	
printmat(C,r1,c1); }  else  
 	System.out.println("Matrix mismatch"); 
} 
else 
{ if(c1==r2) 
{  	int[][] D=new int[r1][c2];  	
multiplication(A,B,D,r1,c1,r2,c2); 
 
 	System.out.println("Result mat : ");  	
printmat(D,r1,c2); 
}  
else  
 	System.out.println("Matrix mismatch"); 
} 
s.close(); 
} 
}