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Introduction To C++ Programming - Part 8.

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;
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];
}
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;
}}
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