main.lst

《8051系列单片机C程序设计完全手册》的光盘中的所有源代码

C51 COMPILER V6.23a  MAIN                                                                  11/05/2002 21:17:46 PAGE 1   


C51 COMPILER V6.23a, COMPILATION OF MODULE MAIN
OBJECT MODULE PLACED IN main.OBJ
COMPILER INVOKED BY: C:\Keil\C51\BIN\C51.EXE main.c DEBUG OBJECTEXTEND

stmt level    source

   1          #include <REG52.H>                /* special function register declarations   */
   2                                            /* for the intended 8051 derivative         */
   3          
   4          #include <stdio.h>                /* prototype declarations for I/O functions */
   5          #include <ctype.h>
   6          
   7          #ifdef MONITOR51                         /* Debugging with Monitor-51 needs   */
              char code reserve [3] _at_ 0x23;         /* space for serial interrupt if     */
              #endif                                   /* Stop Exection with Serial Intr.   */
  10                                                   /* is enabled                        */
  11          
  12          /*------------------------------------------------
  13          The main C function.  Program execution starts
  14          here after stack initialization.
  15          ------------------------------------------------*/
  16          void main (void) {
  17   1      
  18   1              double sum,atof( char s[ ]);
  19   1              char sum1[10],sum2[10];
  20   1      /*------------------------------------------------
  21   1      Setup the serial port for 1200 baud at 16MHz.
  22   1      ------------------------------------------------*/
  23   1      #ifndef MONITOR51
  24   1          SCON  = 0x50;                       /* SCON: mode 1, 8-bit UART, enable rcvr      */
  25   1          TMOD |= 0x20;               /* TMOD: timer 1, mode 2, 8-bit reload        */
  26   1          TH1   = 221;                /* TH1:  reload value for 1200 baud @ 16MHz   */
  27   1          TR1   = 1;                  /* TR1:  timer 1 run                          */
  28   1          TI    = 1;                  /* TI:   set TI to send first char of UART    */
  29   1      #endif
  30   1      /*------------------------------------------------
  31   1      Note that an embedded program never exits (because
  32   1      there is no operating system to return to).  It
  33   1      must loop and execute forever.
  34   1      ------------------------------------------------*/
  35   1              scanf("%s",sum1);
  36   1              scanf("%s",sum2);
  37   1              sum=atof(sum1)+atof(sum2);
  38   1              printf("%s+%s=%f\n", sum1,sum2,sum);
  39   1          while (1) {};
  40   1      }
  41          
  42          double atof( char s[ ])
  43          {
  44   1              double val, power;
  45   1              int i, sign;
  46   1              for ( i = 0; isspace(s[i]); i++ ) /* 跳过空白*/;
  47   1                      sign = (s[i] == '-' ) ? -1 : 1;
  48   1              if ( s[i] == '+' || s[i] == '-' )
  49   1                      i++;
  50   1              for (val = 0.0; isdigit(s[i]); i++)
  51   1                      val = 10.0 * val +(s[i] -'0' );
  52   1              if (s[i]  == '.')
  53   1                      i++;
  54   1              for ( power = 1.0; isdigit(s[i]); i++) {
  55   2                      val = 10.0 * val +(s[i] -'0' );
C51 COMPILER V6.23a  MAIN                                                                  11/05/2002 21:17:46 PAGE 2   

  56   2                      power *= 10.0;
  57   2              }
  58   1              return sign * val / power;
  59   1      }
  60          


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =    549    ----
   CONSTANT SIZE    =     13    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =   ----      35
   IDATA SIZE       =   ----    ----
   BIT SIZE         =   ----    ----
END OF MODULE INFORMATION.


C51 COMPILATION COMPLETE.  0 WARNING(S),  0 ERROR(S)