NPTEL Online Course Week 5 Solution Implement a Matrix ADT

NPTEL Online Course Week 5 Solution Implement a Matrix ADT Assignment

You have to implement a matrix ADT using concepts of C++ classes taught in the lectures. The input matrices would be square matrices. Theclass must support the following functions:

1. Matrix Addition

2. Matrix Subtraction

3. Matrix Multiplication

Your program should take as input: dimension of a square matrix N, two matrices of size N x N with integer values, and one operator symbol (+, - ,*). It must perform the corresponding operation using member functions of Matrix class.

INPUT:

In the first line, one integer which is the dimension of the matrix  and one operator (one of +, - or *)

Two NxN matrices one after the other, supplied one row at a time.

OUTPUT:

Resultant matrix after performing the specified operation, one row at a time. For subtraction, if A is the first matrix and B is the second matrix, perform A-B.

CONSTRAINTS:

The inputs will satisfy the following constraints:
1<=N<=10

There is no need to validate the value of N.

There are no constraints on the values of the entries of the matrices.

Solutions: 
#include <iostream>  
 #include <cstring>  
 using namespace std;  
 struct matrixType{  
   int matDimension;  
   int matValues[10][10];  
 };  
 class MatrixADT{  
   private:  
     matrixType resultMatrix;  
   public:  
     //Member function declarations  
     void intializeResultMatrix(int);  
 matrixType add(matrixType, matrixType);  
     matrixType subtract(matrixType,matrixType);  
     matrixType multiply(matrixType,matrixType);  
     void printResult();  
 };  
 //Member functions of Matrix class to be defined here  
 matrixType MatrixADT::add(matrixType M1, matrixType M2){  
 //Insert code here  
 int i,j,temp=0;  
 matrixType mat;  
 temp=resultMatrix.matDimension;  
   for(i=0;i<temp;i++){  
     for(j=0;j<temp;j++)  
     {  
      resultMatrix.matValues[i][j]=M1.matValues[i][j]+M2.matValues[i][j];    
      mat.matValues[i][j]=resultMatrix.matValues[i][j];  
           }  
     }  
     return mat;  
 }  
 matrixType MatrixADT::subtract(matrixType M1, matrixType M2){  
 //Insert code here  
 int i,j,temp=0;  
 matrixType mat;  
 temp=resultMatrix.matDimension;  
   for(i=0;i<temp;i++){  
     for(j=0;j<temp;j++)  
     {  
        resultMatrix.matValues[i][j]=M1.matValues[i][j]-M2.matValues[i][j];  
        mat.matValues[i][j]=resultMatrix.matValues[i][j];    
     }  
     }  
     return mat;  
 }  
 matrixType MatrixADT::multiply(matrixType M1, matrixType M2){  
 //Insert code here  
 int i,j,temp=0,k;  
 matrixType mat;  
 temp=resultMatrix.matDimension;  
 for(i=0;i<temp;i++){  
 for(j=0;j<temp;j++)  
 {  
 mat.matValues[i][j]=0;  
 for(k=0;k<temp;k++)  
 {  
 resultMatrix.matValues[i][j]=mat.matValues[i][j]+(M1.matValues[i][k]*M2.matValues[k][j]);  
 mat.matValues[i][j]=resultMatrix.matValues[i][j];    
 }  
 }  
 }  
   return mat;  
 }  
 void MatrixADT::intializeResultMatrix(int dim){  
  resultMatrix.matDimension=dim;  
   /*for(i=0;i<dim;i++){  
     for(j=0;j<dim;j++)  
     {  
       cin>>resultMatrix.matValues[i][j];  
     }  
   }*/  
 }  
 int main(){  
   MatrixADT maX;  
   matrixType M1, M2;  
   char op;  
   int dim,i,j;  
    cin>>dim>>op;  
   //intialize the dimension for the matrices  
   maX.intializeResultMatrix(dim);  
   //enter value for matrix M1  
   for(i=0;i<dim;i++){  
   for(j=0;j<dim;j++)  
   {  
     cin>>M1.matValues[i][j];  
   }  
   }  
   //enter value for matrix M2  
   for(i=0;i<dim;i++){  


   for(j=0;j<dim;j++)  
   {  
     cin>>M2.matValues[i][j];  
   }  
   }  
   switch(op)  
   {  
     case '+': maX.add(M1,M2);    
       break;  
     case '-': maX.subtract(M1,M2);  
       break;  
     case '*': maX.multiply(M1,M2);  
       break;  
   }  
 /*Enter your code here to accept two input matrices as instances of class Matrix and perform the operations using member functions, display the result matrix using member function*/  
 /* DO NOT EDIT the code below; if you edit it, your program will not give correct output   
 maX.printResult();  
 }  
 void MatrixADT::printResult(){  
   int i,j;  
   for (i=0;i<resultMatrix.matDimension;i++){  
     for (j=0; j<resultMatrix.matDimension-1;j++){  
       cout<<resultMatrix.matValues[i][j]<<" ";  
     }  
     cout <<resultMatrix.matValues[i][j]<<"\n";  
   }  
   cout <<”Done”;  
 }  

 */