Parcurgere de matrice in spirala

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//parcurgerea unei matrici in spirala
#include 
#include 
#include 

void citire(int m, int n, int a[20][20],char c)
{
for(int i=1;i<=m;i++)
  for(int j=1;j<=n;j++)
    {
      printf("%c[%i][%i]=",c,i,j);
      scanf("%d",&a[i][j]);
    }
}

void afisare(int m, int n, int a[20][20])
{
for(int i=1;i<=m;i++)
 {
  for(int j=1;j<=n;j++)
    printf(" %d ",a[i][j]);
    printf("n");
    }
}

void main()
{
int n;
int a[20][20],i,j;
printf("n=");
scanf("%d",&n);

 printf("nCitire matricen");
 citire(n,n,a,'A');
 printf("Afisare matrice n");
 afisare(n,n,a);
 printf("nParcurgere Spiralan");
 
     for (i=1;i<=(n/2)+(n%2);i++)
       {
         for (j=i; j<=m-i+1; j++) printf("%d ",a[i][j]);
         for (j=1+i; j<=n-i+1; j++) printf("%d ",a[j][m-i+1]);
         for (j=m-i;j>=i;j--) printf("%d ",a[n-i+1][j]);
         for (j=n-i; j>=i+1; j--) printf("%d ",a[j][i]);
       }
getch();
}