ch27-11.c

C语言程序设计上机指导与练习 冶金工业出版社 刘怀亮

#include <stdio.h>
#define MAX  2000
int a[MAX], b[MAX], cnt = 0;

void jsVal()
{
   int i,j,thou,hun,ten,data,ab,cd;
   for(i=0;i<2000;i++)
   {
      thou=a[i]/1000;  
      hun=a[i]%1000/100;
      ten=a[i]%100/10; 
      data=a[i]%10;
      ab=10*thou+ten;  
      cd=10*data+hun;
      if((ab-cd)>=0&&(ab-cd)<=10&&ab%2==1&&cd%2==1&&ab>=10&&cd>=10)
         b[cnt++]=a[i];
   }
   for(i=0;i<cnt-1;i++)
      for(j=i+1;j<cnt;j++)
         if(b[i]<b[j]) {thou=b[i]; b[i]=b[j];b[j]=thou;}
}

void readDat()
{
   int i;
   for(i = 0; i < MAX; i++) a[i]=i+1001;
}

writeDat()
{
   FILE *fp;
   int i;
   fp = fopen("out.dat", "w");
   fprintf(fp, "%d\n", cnt);
   for(i=0;i<cnt;i++) fprintf(fp,"%d\n",b[i]);
   fclose(fp);
}

void main()
{
   int i;
   readDat();
   jsVal();
   printf("满足条件的数=%d\n", cnt);
   for(i = 0; i < cnt; i++) printf("%d ", b[i]);
   printf("\n");
   writeDat();
}