C Program to Multiply two Matrices by Passing Matrix to a Function

#include <stdio.h>

void enterData(int firstMatrix[][10], int secondMatrix[][10], int rowFirst, int columnFirst, int rowSecond, int columnSecond);
void multiplyMatrices(int firstMatrix[][10], int secondMatrix[][10], int multResult[][10], int rowFirst, int columnFirst, int rowSecond, int columnSecond);
void display(int mult[][10], int rowFirst, int columnSecond);

int main()
{
    int firstMatrix[10][10], secondMatrix[10][10], mult[10][10], rowFirst, columnFirst, rowSecond, columnSecond, i, j, k;

    printf("Enter rows and column for first matrix: ");
    scanf("%d %d", &rowFirst, &columnFirst);

    printf("Enter rows and column for second matrix: ");
    scanf("%d %d", &rowSecond, &columnSecond);

    // If colum of first matrix in not equal to row of second matrix, asking user to enter the size of matrix again.
    while (columnFirst != rowSecond)
    {
        printf("Error! column of first matrix not equal to row of second.\n");
        printf("Enter rows and column for first matrix: ");
        scanf("%d%d", &rowFirst, &columnFirst);
        printf("Enter rows and column for second matrix: ");
        scanf("%d%d", &rowSecond, &columnSecond);
    }

    // Function to take matrices data
        enterData(firstMatrix, secondMatrix, rowFirst, columnFirst, rowSecond, columnSecond);

        // Function to multiply two matrices.
        multiplyMatrices(firstMatrix, secondMatrix, mult, rowFirst, columnFirst, rowSecond, columnSecond);

        // Function to display resultant matrix after multiplication.
        display(mult, rowFirst, columnSecond);

    return 0;
}

void enterData(int firstMatrix[][10], int secondMatrix[][10], int rowFirst, int columnFirst, int rowSecond, int columnSecond)
{
    int i, j;
    printf("\nEnter elements of matrix 1:\n");
    for(i = 0; i < rowFirst; ++i)
    {
        for(j = 0; j < columnFirst; ++j)
        {
            printf("Enter elements a%d%d: ", i + 1, j + 1);
            scanf("%d", &firstMatrix[i][j]);
        }
    }

    printf("\nEnter elements of matrix 2:\n");
    for(i = 0; i < rowSecond; ++i)
    {
        for(j = 0; j < columnSecond; ++j)
        {
            printf("Enter elements b%d%d: ", i + 1, j + 1);
            scanf("%d", &secondMatrix[i][j]);
        }
    }
}

void multiplyMatrices(int firstMatrix[][10], int secondMatrix[][10], int mult[][10], int rowFirst, int columnFirst, int rowSecond, int columnSecond)
{
    int i, j, k;

    // Initializing elements of matrix mult to 0.
    for(i = 0; i < rowFirst; ++i)
    {
        for(j = 0; j < columnSecond; ++j)
        {
            mult[i][j] = 0;
        }
    }

    // Multiplying matrix firstMatrix and secondMatrix and storing in array mult.
    for(i = 0; i < rowFirst; ++i)
    {
        for(j = 0; j < columnSecond; ++j)
        {
            for(k=0; k<columnFirst; ++k)
            {
                mult[i][j] += firstMatrix[i][k] * secondMatrix[k][j];
            }
        }
    }
}

void display(int mult[][10], int rowFirst, int columnSecond)
{
    int i, j;
    printf("\nOutput Matrix:\n");
    for(i = 0; i < rowFirst; ++i)
    {
        for(j = 0; j < columnSecond; ++j)
        {
            printf("%d  ", mult[i][j]);
            if(j == columnSecond - 1)
                printf("\n\n");
        }
    }
}