### Python Program to Perform Addition,Subtraction and Multiplication of two Matrices

Program to Perform Addition,Subtraction and Multiplication of two Matrices

1) Given Matrices can be added if no. of Rows and Columns of matrix 1 is equal to no. of Rows and Columns of matrix 2 respectively,
2) Given Matrices can be Subtracted if no. of Rows and Columns of matrix 1 is equal to no. of Rows and Columns of matrix 2 respectively,
3)Given Matrices can be multiplied if no. of Columns of matrix 1 is equal to no. of Rows for matrix 2

Program:

`class Matrices:`
`    def __init__(self,A,B):`
`        self.A=A`
`        self.B=B`
`    def display(self,C):`
`        print('Resultant Matrix is:')`
`        for i in range(0,m):`
`            print('\n')`
`            for j in range(0,n):`
`                print(' {}'.format(C[i][j]),end=" ")`
`    def Add(self,C):`
`        for i in range(0,m):`
`            for j in range(0,n):`
`                C[i][j] = A[i][j] + B[i][j]`
`    def Sub(self,C):`
`        for i in range(0,m):`
`            for j in range(0,n):`
`                C[i][j] = A[i][j] - B[i][j]`
`    def Mul(self,C):`
`        for i in range(0,m):`
`            for j in range(0,q):`
`                for k in range(0,n):`
`                    C[i][j]+= A[i][k] * B[k][j]`
`if __name__=='__main__':`
`    m = int(input('Enter no. of rows for Matrix 1:'))`
`    n = int(input('Enter no. of columns for Matrix 1:'))`
`    A = [[0 for j in range(0, n)] for i in range(0, m)]`
`    print('Enter Elements of Matrix A')`
`    for i in range(0, m):`
`        for j in range(0, n):`
`            A[i][j] = int(input('Enter element A{}{}:'.format(i, j)))`
`    p = int(input('Enter no. of rows for Matrix 2:'))`
`    q = int(input('Enter no. of columns for Matrix 2:'))`
`    B = [[0 for j in range(0, q)] for i in range(0, p)]`
`    print('Enter Elements of Matrix B')`
`    for i in range(0, p):`
`        for j in range(0, q):`
`            B[i][j] = int(input('Enter element B{}{}:'.format(i, j)))`
`    obj = Matrices(A,B)`
`    var =1`
`    while var!='0':`
`        print('1.Add Matrices\n2.Subtract Matrices\n3.Multiply Matrices\n4.Exit')`
`        choice = int(input('Enter Choice:'))`
`        if choice==1:`
`            if m==p and n==q:`
`                print('Matrices can be Added')`
`                C = [[0 for j in range(0, n)] for i in range(0, m)]`
`                obj.Add(C)`
`                obj.display(C)`
`            else:`
`                print('Matrices cannot be Added')`
`        elif choice==2:`
`            if m==p and n==q:`
`                print('Matrices can be Subtracted')`
`                C = [[0 for j in range(0, n)] for i in range(0, m)]`
`                obj.Sub(C)`
`                obj.display(C)`
`            else:`
`                print('Matrices cannot be Subtracted')`
`        elif choice==3:`
`            if n==p:`
`                print('Matrices can be Multiplied')`
`                C = [[0 for j in range(0, q)] for i in range(0, m)]`
`                obj.Mul(C)`
`                obj.display(C)`
`            else:`
`                print('Matrices cannot be Multiplied')`
`        elif choice==4:`
`            exit(0)`
`        else:`
`            print('\nPlease enter a valid choice')`
`        var = (input('\nDo you want to Continue?(press 0 to stop)'))`

INPUT & OUTPUT:
Enter no. of rows for Matrix 1:2
Enter no. of columns for Matrix 1:2
Enter Elements of Matrix A
Enter element A00:1
Enter element A01:2
Enter element A10:3
Enter element A11:4
Enter no. of rows for Matrix 2:2
Enter no. of columns for Matrix 2:2
Enter Elements of Matrix B
Enter element B00:1
Enter element B01:2
Enter element B10:3
Enter element B11:4
2.Subtract Matrices
3.Multiply Matrices
4.Exit
Enter Choice:1
Resultant Matrix is:

2  4

6  8
Do you want to Continue?(press 0 to stop)a
2.Subtract Matrices
3.Multiply Matrices
4.Exit
Enter Choice:2
Matrices can be Subtracted
Resultant Matrix is:

0  0

0  0
Do you want to Continue?(press 0 to stop)d
2.Subtract Matrices
3.Multiply Matrices
4.Exit
Enter Choice:3
Matrices can be Multiplied
Resultant Matrix is:

7  10

15  22
Do you want to Continue?(press 0 to stop)0

Process finished with exit code 0

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