Sum of two Matrix

Sum of two matrix in C
Addition of two matrix in C

 #include<stdio.h>
 #define M 20
int main()
{
  int a[M][M],b[M][M],c[M][M],i,j,n;
  printf("Enter the size of Matrix: ");
  scanf("%d",&n);
  printf("Enter the First matrix: ");
  for(i=0;i<n;i++)
      for(j=0;j<n;j++)
           scanf("%d",&a[i][j]);
  printf("\nEnter the Second matrix: ");
  for(i=0;i<n;i++)
      for(j=0;j<n;j++)
           scanf("%d",&b[i][j]);
  printf("\nThe First matrix is\n");
  for(i=0;i<n;i++)
    {
      printf("\n");
      for(j=0;j<n;j++)
           printf("%d\t",a[i][j]);
  }
  printf("\nThe Second matrix is\n");
  for(i=0;i<n;i++)
  {
      printf("\n");
      for(j=0;j<n;j++)
      printf("%d\t",b[i][j]);
   }
   for(i=0;i<n;i++)
       for(j=0;j<n;j++)
            c[i][j]=a[i][j]+b[i][j];
   printf("\nThe Addition of two matrix is\n");
   for(i=0;i<n;i++)
   {
       printf("\n");
       for(j=0;j<n;j++)
            printf("%d\t",c[i][j]);
   }
   return 0;
}