C++ Program To Multiply Two Matrices
Using Multi-dimensional Arrays
#include <iostream>
using namespace std;
int main() {
int a[10][10], b[10][10], mult[10][10],
r1, c1, r2, c2, i, j, k;
cout << "Enter No. Of Rows
& Columns For First Matrix:\n";
cin >> r1 >> c1;
cout << "\nEnter No. Of Rows
& Columns For Second Matrix:\n";
cin >> r2 >> c2;
while (c1!=r2) {
cout << "\nError! Column Of
First Matrix Is Not Equal To Row Of Second Matrix.\n";
cout << "\nEnter No. Of Rows
& Columns For First Matrix:\n";
cin >> r1 >> c1;
cout << "\nEnter No. Of Rows
& Columns For Second Matrix:\n";
cin >> r2 >> c2;
}
cout << endl <<
"\nEnter The Elements Of Matrix 1:" << endl;
cout << "Enter The Element
a" << "[" << i+1 << j+1 << "]"
<< " : ";
cin >> a[i][j];
}
cout << endl <<
"\nEnter The Elements Of Matrix 2:" << endl;
for(i=0; i<r2; ++i)
for(j=0; j<c2; ++j) {
cout << "Enter The Element
b" << "[" << i+1 << j+1 << "]"
<< " : ";
cin >> b[i][j];
}
for(i=0; i<r1; ++i)
for(j=0; j<c2; ++j) {
mult[i][j]=0;
}
for(i=0; i<r1; ++i)
for(j=0; j<c2; ++j)
for(k=0; k<c1; ++k) {
mult[i][j]+=a[i][k]*b[k][j];
}
cout << endl << "\nOutput
Matrix: " << endl;
for(i=0; i<r1; ++i)
for(j=0; j<c2; ++j) {
cout << " " <<
mult[i][j];
if(j==c2-1)
cout << endl;
}
return 0;
}
C++ Program To Multiply Two Matrices
Using Function
#include <iostream>
using namespace std;
void take_data(int a[][10], int b[][10],
int r1,int c1, int r2, int c2);
void multiplication(int a[][10],int
b[][10],int mult[][10],int r1,int c1,int r2,int c2);
void display(int mult[][10], int r1, int
c2);
int main() {
int a[10][10], b[10][10], mult[10][10],
r1, c1, r2, c2, i, j, k;
cout << "Enter Rows &
Columns For First Matrix: " << endl;
cin >> r1 >> c1;
cout << "\nEnter Rows &
Columns For Second Matrix: " << endl;
cin >> r2 >> c2;
while (c1!=r2) {
cout << "\nError! Column Of
First Matrix Is Not Equal To Row Of Second Matrix.\n";
cout << "\nEnter No. Of Rows
& Columns For First Matrix:\n";
cin >> r1 >> c1;
cout << "\nEnter No. Of Rows
& Columns For Second Matrix:\n";
cin >> r2 >> c2;
}
take_data(a,b,r1,c1,r2,c2); /* Function to take matrices data */
multiplication(a,b,mult,r1,c1,r2,c2); /*
Function to multiply two matrices. */
display(mult,r1,c2); /* Function to
display resultant matrix after multiplication. */
return 0;
}
void take_data(int a[][10], int b[][10],
int r1,int c1, int r2, int c2) {
int i,j;
cout << endl <<
"\nEnter The Elements Of Matrix 1:" << endl;
for(i=0; i<r1; ++i)
for(j=0; j<c1; ++j) {
cout << "Enter The Element
a" << "[" << i+1 << j+1 << "]"
<< " : ";
cin >> a[i][j];
}
cout << endl <<
"\nEnter The Elements Of Matrix 2:" << endl;
for(i=0; i<r2; ++i)
for(j=0; j<c2; ++j) {
cout << "Enter The Element
b" << "[" << i+1 << j+1 << "]"
<< " : ";
cin >> b[i][j];
}}
void multiplication(int a[][10],int
b[][10],int mult[][10],int r1,int c1,int r2,int c2) {
int i,j,k;
for(i=0; i<r1; ++i)
for(j=0; j<c2; ++j) {
mult[i][j]=0;
}
for(i=0; i<r1; ++i)
for(j=0; j<c2; ++j)
for(k=0; k<c1; ++k) {
mult[i][j]+=a[i][k]*b[k][j];
}}
void display(int mult[][10], int r1, int
c2) {
int i, j;
cout << endl << "Output
Matrix: " << endl;
for(i=0; i<r1; ++i)
for(j=0; j<c2; ++j) {
cout << " " <<
mult[i][j];
if(j==c2-1)
cout << endl;
}}