Question

Write a SIMPLE C++ Program that performs the Multiplication of 2 Arrays (two dimensional arrays). Use Comments to give a Simple description.

Answer 1

#include<iostream>
using namespace std;
int main()
{

int a[10][10],b[10][10],mul[10][10],r1,c1,r2,c2;
cout<<"\nEnter # of rows and column of first matrix(array): ";
cin>>r1>>c1;//accept #of row and col in 1st array
cout<<"\nEnter # of rows and column of second matrix(array): ";
cin>>r2>>c2; // accept row and col in 2nd matrix
if(c1!=r2)
cout<<"\nThe two arrays are not compactible for multiplication";
else
{
cout<<"\nEnter number in first array :"<<endl;
for(int i=0;i<r1;i++){
for(int j=0;j<c1;j++)
{
cout<<"\nEnter a["<<i<<"]["<<j<<"] :";
cin>>a[i][j]; // accepting 1st array from user
}
}
cout<<"\nEnter number in second array :"<<endl;
for(int i=0;i<r2;i++){
for(int j=0;j<c2;j++)
{
cout<<"\nEnter b["<<i<<"]["<<j<<"] :";
cin>>b[i][j]; // accepting second array from user
}
}
int tot=0;
for (int c = 0; c < r1; c++)
{ for (int d = 0; d < r2; d++)
{ for (int k = 0; k < c2; k++)
{ tot = tot + a[c][k] * b[k][d];// mutliplying row and column of array and adding the values
}
mul[c][d] = tot; tot = 0;
}
}

cout<<"\nThe multiplication of two array is :";
for(int i=0;i<r1;i++)
{
cout<<endl;
for(int j=0;j<c2;j++)
cout<<mul[i][j]<<" ";
}

}

}

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