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Matrix Multiplication in c language

first matrix:     second matrix:    answer matrix is:

2   3                    3     4                    30         29

3   2                    8     7                    27         26


below is code in c language:

#include <stdio.h>
#include <string.h>
#include <math.h>
#include <ctype.h>
#include <stdlib.h>
int main()
{
    int row1, row2, col1, col2, sum;
    printf("Enter the row and column for matrix 1\n");
    scanf("%d %d", &row1, &col1);
    printf("Enter the row and column for matrix 2\n");
    scanf("%d %d", &row2, &col2);
    int mat1[row1][col1];
    int mat2[row2][col2];
    int ansmat[row1][col2];
    printf("Enter the first matrix\n");
    for (int i = 0; i < row1; i++)
    {
        for (int j = 0; j < col1; j++)
        {
            scanf("%d", &mat1[i][j]);
        }
    }
    printf("Enter the second matrix\n");
    for (int i = 0; i < row2; i++)
    {
        for (int j = 0; j < col2; j++)
        {
            scanf("%d", &mat2[i][j]);
        }
    }

    if (col1 == row2)
    {

        for (int i = 0; i < row1; i++)
        {
            for (int j = 0; j < col2; j++)
            {
                sum = 0;
                for (int k = 0; k < row2; k++)
                {
                    sum = sum + (mat1[i][k] * mat2[k][j]);
                }
                ansmat[i][j] = sum;
            }
        }
        printf("The answer matrix is below\n");
        for (int i = 0; i < row1; i++)
        {
            for (int j = 0; j < col2; j++)
            {
                printf("%d\t", ansmat[i][j]);
            }
            printf("\n");
        }
    }
    else
    {
        printf("Multiplication is not possible\n");
    }

    return 0;
}
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