# Matrix multiplication in C++

#### How matrix multiplication in C++ Works:

• Input two matrices.
• Run 3 for loops (i,j,k).
• Multiplication will be addition of First_Matrix[i][k]*Second_Matrix[k][j] for each element.
• Resultant matrix is stored in third Matrix.

### CODE:

```#include<iostream>
using namespace std;
int main(){
//Using const int for array size
const int row=2,col=2;
// if not use const error found
cout<<"Size of Matrices : "<<row<<" X "<<col<<endl;
cout<<"Enter Value For FirstMatrix Matrix:"<<endl;

int firstMatrix[row][col];
int secondMatrix[row][col];
int resultantMatrix[row][col], var;

int i,j;
for( i=0;i<row;i++){
cout<<"Enter value for row number: "<<i+1<<endl;
for( j=0;j<col;j++){
cin>>firstMatrix[i][j];
}
}
cout<<"nnnEnter Value For SecondMatrix Matrix:"<<endl;
for( i=0;i<row;i++){
cout<<"Enter value for row number: "<<i+1<<endl;
for( j=0;j<col;j++){
cin>>secondMatrix[i][j];
}
}
var=0;
// ResultantMatrixant Matrix
for( i=0;i<row;i++){
for( j=0;j<col;j++){
for(int k=0;k<row;k++){
var=var+(firstMatrix[i][k]*secondMatrix[k][j]);
cout<<var<<endl;
}
resultantMatrix[i][j]=var;
var=0;
}
}
cout<<"nnttResultant Matrix:"<<endl;

for( i=0;i<row;i++){
cout<< endl;
for( j=0;j<col;j++){
cout<<"tt"<<resultantMatrix[i][j]<<"    ";
}
}
return 0;
}```