3.9.cpp

c程序设计技巧, c入门和简单算法设计。

#include<stdio.h>
void print_matrix(int n)
{
     int a[101][101];
     int i,j,k;
     k=1;
     for(i=1;i<=n/2;i++)
     {
                       for(j=i;j<=n-i;j++)
                       {
                                         a[j][i]=k;
                                         k++;
                                         }
                       for(j=i;j<=n-i;j++)
                       {
                                          a[n+1-i][j]=k;
                                          k++;
                                          }
                       for(j=n+1-i;j>=i+1;j--)
                       {
                                              a[j][n+1-i]=k;
                                              k++;
                                              }
                       for(j=n+1-i;j>=i+1;j--)
                       {
                                              a[i][j]=k;
                                              k++;
                                              }
            }
                       if(n%2==1)
                       {
                                 i=(n+1)/2;
                                 a[i][i]=n*n;
                                 }
                       for(i=1;i<=n;i++)
                       {
                                        
                       for(j=1;j<=n;j++)
                       printf("%4d",a[i][j]);
                       printf("\n");
                       }
}
void print_Matrix(int n)
{
     int i,j,k,t,a[101][101],b[2],x,y;
     b[0]=0;
     b[1]=1;
     k=n;
     t=1;
     x=1;
     while(x<=n*n)
     {
                  for(y=1;y<=2*k-1;y++)
                  {
                                      b[y/(k+1)]=b[y/(k+1)]+t;
                                      a[b[0]][b[1]]=x;
                                      x++;
                  }
                                      k--;
                                      t=-t;
                                      }
     for(i=1;i<=n;i++)
     {
                      for(j=1;j<=n;j++)
                      printf("%4d",a[i][j]);
                      printf("\n");
                      }
}
                                      
     
int main()
{
    int n;
    scanf("%d",&n);
    printf("Print by Classify\n");
    print_matrix(n);
    printf("Printf by one loop\n");
    print_Matrix(n);
    scanf("%d",&n);
    return 0;
}