BlueJ menu driven program on matrix

import java.io.*;

class M

{

int i, j, k, l, m, n, o, option;

int mat1[][], mat2[][], mat3[][];

BufferedReader br=new BufferedReader(new InputStreamReader(System.in));

public void take() throws Exception

{

System.out.println("Program for operations of matrix.\n\n");

System.out.println("First matrix--Enter number of rows : ");

k=Integer.parseInt(br.readLine());

System.out.println("Enter number of columns : ");

l=Integer.parseInt(br.readLine());

mat1=new int[k][l];

System.out.println("Second matrix--Enter number of rows : ");

m=Integer.parseInt(br.readLine());

System.out.println("Enter number of columns : ");

n=Integer.parseInt(br.readLine());

mat2=new int[m][n];

mat3=new int[k][n];

System.out.println("\nFirst matrix:");

for(i = 0; i< k; i++)

{

for(j = 0; j< l; j++)

{

System.out.println("\nEnter value:");

mat1[i][j]=Integer.parseInt(br.readLine());

}

}

System.out.println("\nSecond matrix:");

for(i = 0; i< m; i++)

{

for(j = 0; j< n; j++)

{

System.out.println("\nEnter value:");

mat2[i][j]=Integer.parseInt(br.readLine());

}

}

choice();

}

private void choice()throws Exception

{

do

{

System.out.println("\nEnter your choice:");

System.out.print("0 for EXIt, 1 for Adition, 2 for Subtraction, 3 for  Multiplication");

System.out.println("\n\t\tEnter yout option : ");

option=Integer.parseInt(br.readLine());

if ((option >= 1) && (option < =3))

{

if (option == 1)

{

if ((k == m) && (l == n))

{

for(i = 0; i< k; i++)

{

for(j = 0; j< l; j++)

mat3[i][j] = mat1[i][j] + mat2[i][j];

}

}

else

{

System.out.println("\nSummation not possible\n");

return;

}

}

if (option == 2)

{

if ((k == m) && (l == n))

{

for(i = 0; i< k; i++)

{

for(j = 0; j< l; j++)

mat3[i][j] = mat1[i][j] - mat2[i][j];

}

}

else

{

System.out.println("\nSubtraction not possible\n");

return;

}

}

if (option == 3)

{

if (l == m)

{

for(i = 0; i< k; i++)

{

for(j = 0; j< n; j++)

{

mat3[i][j] = 0;

for(o = 0; o< m; o++)

mat3[i][j] = mat3[i][j] + mat1[i][o] * mat2[o][j];

}

}

}

else

{

System.out.println("\nMultiplication not possible\n");

return;

}

}

System.out.println("*** Matrix 1 ***\n");

for(i = 0; i< k; i++)

{

for(j = 0; j< l; j++)

System.out.print(" "+ mat1[i][j]);

System.out.println();

}

System.out.println("*** Matrix 2 ***\n");

for(i = 0; i< m; i++)

{

for(j = 0; j< n; j++)

System.out.print(" "+ mat2[i][j]);

System.out.println();

}

System.out.println("*** Result ***\n");

for(i = 0; i< k; i++)

{

for(j = 0; j< n; j++)

System.out.print(" "+ mat3[i][j]);

System.out.println();

}

}

}

while(option != 0);

}

public static void main(String args[]) throws Exception

{

 M ob=new M();

 ob.take();

 }

 }

Related Post: BlueJ Menu Based Programs