Program in C for subtraction of two matrices

Write a program in C for subtraction of two matrices 

#include<stdio.h>

#include<conio.h>

//Read Matrix

void read_mat(float a[][10],int m,int n)

{

            int i,j;

            printf("\n\nEnter %d X %d matrix below:\n",m,n);

            for(i=0;i<m;i++)

                        for(j=0;j<n;j++)

                                    scanf("%f",&a[i][j]);

}

//Write Matrix

void write_mat(float a[][10],int m,int n)

{

            int i,j;

            for(i=0;i<m;i++)

            {

                        for(j=0;j<n;j++)

                                    printf("%10.2f",a[i][j]);

                        printf("\n");

            }

}

//Subtract matrices

void sub_mat(float a[][10],float b[][10],float c[][10],int m,int n)

{

            int i,j;

            for(i=0;i<m;i++)

                        for(j=0;j<n;j++)

                                    c[i][j]=a[i][j] - b[i][j];

}

//main function

void main()

{

            float x[10][10],y[10][10],z[10][10];

            int m,n;

            clrscr();

            //Accept two matrices

            printf("\n\nEnter order of matrix \n");

            scanf("%d %d",&m,&n);

            read_mat(x,m,n);

            read_mat(y,m,n);

            //call sub_mat() function

            sub_mat(x,y,z,m,n);

            printf("\n\nSUBTRACTION OF THE GIVEN MATRICES IS:\n");

            write_mat(z,m,n);

            getch();

}