ex4-13.c

这是《Keil Cx51 V7.0单片机高级语言编程与uVision2应用实践》教材各章中列出的全部程序例子。

    #include <stdio.h>
    #define  MAX  20
    main()  {
      int  i, j, n, p, r, primes[MAX];
      int  *pntw, *pntr;
      long q;
      pntw = primes;
      n = 2;
      *pntw++ = 2; *pntw++ = 3;
      i = 5;
      do  {
         pntr = primes;
         do  {
            p = *pntr++;
            q = i / p;
            r = i - q * p;
          } while( r && i < q*q );
         if( r ) {
            *pntw++ = i;
            n++;
          }
         i += 2;
       } while( n < MAX );
       j = 0;
       pntr = primes;
       for( i=0; i<MAX; ++i )  {
          printf("%4d",*pntr++);
          if( ++j == 10 ) {
             printf("\n");
             j = 0;
           }
        }
        while(1);
     }