c program to multiply two matrix

#include<stdio.h>
main()
{
int n,m,i,j,k,sum,p,q,a[10][10],b[10][10];
clrscr();
printf("Enter the order of matrix A \n");
scanf("%d%d",&m,&n);
printf("Enter the elements of A\n");
for(i=0;i<m;i++)
{
for(j=0;j<n;j++)
{
scanf("%d",&a[i][j]);
}
}
printf("Enter the order of matrix B\n");
scanf("%d%d",&p,&q);
printf("\n Enter the elements for B \n");
for(i=0;i<p;i++)
{
for(j=0;j<q;j++)
{
scanf("%d",&b[i][j]);
}
}
if(n==p)
{
printf("......A * B............\n");
for(i=0;i<m;i++)
{
for(j=0;j<n;j++)
{
sum=0;
for(k=0;k<p;k++)
{
sum=sum+(a[i][k]*b[k][j]);
}
printf("%d\t",sum);
}
printf("\n");
}
}else
printf("not a valid order\n");
getch();
}