matrix multiplication without function

Author: hustlesid

matrix multiplication

@@ -0,0 +1,70 @@
+#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 rows and columns for first matrix: ";
+    cin >> r1 >> c1;
+    cout << "Enter rows and columns for second matrix: ";
+    cin >> r2 >> c2;
+
+    // If column of first matrix in not equal to row of second matrix,
+    // ask the user to enter the size of matrix again.
+    while (c1!=r2)
+    {
+        cout << "Error! column of first matrix not equal to row of second.";
+
+        cout << "Enter rows and columns for first matrix: ";
+        cin >> r1 >> c1;
+
+        cout << "Enter rows and columns for second matrix: ";
+        cin >> r2 >> c2;
+    }
+
+    // Storing elements of first matrix.
+    cout << endl << "Enter elements of matrix 1:" << endl;
+    for(i = 0; i < r1; ++i)
+        for(j = 0; j < c1; ++j)
+        {
+            cout << "Enter element a" << i + 1 << j + 1 << " : ";
+            cin >> a[i][j];
+        }
+
+    // Storing elements of second matrix.
+    cout << endl << "Enter elements of matrix 2:" << endl;
+    for(i = 0; i < r2; ++i)
+        for(j = 0; j < c2; ++j)
+        {
+            cout << "Enter element b" << i + 1 << j + 1 << " : ";
+            cin >> b[i][j];
+        }
+
+    // Initializing elements of matrix mult to 0.
+    for(i = 0; i < r1; ++i)
+        for(j = 0; j < c2; ++j)
+        {
+            mult[i][j]=0;
+        }
+
+    // Multiplying matrix a and b and storing in array mult.
+    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];
+            }
+
+    // Displaying the multiplication of two matrix.
+    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;
+    }
+
+    return 0;
+}