菱形块

#include<stdio.h>  #include<math.h>  void main()  {      int i,j,n,m;      while(scanf("%d",&m)!=EOF){          if(m%2==1){              for(i=1;i<=m;i++){                  for(j=1;j<=fabs(i-(m+1)/2);j++)                      printf(" ");                  for(n=1;n<=m-2*fabs(i-(m+1)/2);n++){                      printf("*");                  }                  printf("\n");              }          }          else{              printf("error\n");          }      }  }