C program for matrix multiplication

LICENSE.txt

The MIT License (MIT)

Copyright (c) 2016 Dylan Dsouza

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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SOFTWARE.

matrix_mult.c

#include <stdio.h>

void main()
{
	int c1 = 3; // Columns of first matrix
	int r1 = 1; // Rows of first matrix

	int c2 = 2; // Columns of second matrix
	int r2 = 3; // Rows of second matrix
	/*
    *
    * Please note that if user must input rows and columns, code can be modified accordingly.
    *
    */
    
	int mat1[r1][c1]; // Init matrix 1
	int mat2[r2][c2]; // Init matrix 2
	
	int c; // Init counter varable c
	int d; // Init counter variabls d
    
    
    /*
    * Read input for matrix 1
    */
	for(c = 0; c < r1; c++)
	{
		for(d = 0; d < c1; d++) {
			printf("Enter %dx%d : ", c+1, d+1);
			scanf("%d", &mat1[c][d]);
			printf("\n");
		}
	}
    
    /*
    * Read input for matrix 2
    */
    for(c = 0; c < r2; c++)
	{
		for(d = 0; d < c2; d++) {
			printf("Enter %dx%d : ", c+1, d+1);
			scanf("%d", &mat2[c][d]);
			printf("\n");
		}
	}
	
    /*
    * Check if matrix multiplication is possible.
    */
    if(c1 == r2)
	{
        
        /*
        * Init the product matrix
        */
		int prod[r1][c2];
        for(c = 0; c < r1; c++)
        {
            for(d = 0; d < c2; d++)
            {
                prod[c][d] = 0;
            }
            printf("\n");
        }
        
        /*
        * Compute the solution.
        */
        for(c = 0; c < r1; c++)
        {
            int a = c;
            for(d = 0; d < c2; d++)
            {
                int m = 0;
                while(m < c1) {
                    prod[c][d] += mat1[c][m] * mat2[m][d];
                    m++;    
                }
            }
        }
        
        /*
        * Print the solution
        */
        printf("Solution is:\n");
        int x, y;
        for(x = 0; x < r1; x++)
        {
            for(y = 0; y < c2; y++)
            {
                printf("%d ", prod[x][y]);
            }
            printf("\n");
        }
	}
    else
    {
        
        /*
        * If not possible notify the user accordingly
        */
        printf("Can't multiply %dx%d matrix with %dx%d matrix.\n",r1,c1,r2,c2);
    }
}