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[/] [forwardcom/] [examples/] [guess_number.as] - Blame information for rev 156

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1 134 Agner
/************************  guess_number.as  **********************************
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* Author:        Agner Fog
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* date created:  2018-02-23
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* last modified: 2021-08-04
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* Version:       1.11
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* Project:       ForwardCom example, assembly code
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* Description:   Guessing game. Guess a number 1 - 100
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*
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* Copyright 2018-2021 GNU General Public License http://www.gnu.org/licenses
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*****************************************************************************/
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%buffersize = 0x20                               // size of input text buffer
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%maxnum = 100                                    // maximum number
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const section read ip                            // read-only data section
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intro:    int8 "\nGuessing game. Guess a number 1 - %i\n",0  // format string
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guess:    int8 "Your guess:",0                               // text
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smaller:  int8 "\nSmaller",0                                 // text
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bigger:   int8 "\nBigger",0                                  // text
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conclude: int8 "\nYou guessed the number %i in %i tries",0   // format string
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another:  int8 "\nAnother? (y/n) ",0                         // text
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goodbye:  int8 "\nGoodbye", 0                                // text
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const end
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bss section datap uninitialized                  // uninitialized read/write data section
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int64 parlist[4]                                 // parameter list for printf
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int8 buf[buffersize]                             // input buffer
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bss end
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code section execute                             // code section
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extern _puts: function                           // library function: write string to stdout
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extern _gets_s: function                         // library function: read string from stdin
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extern _printf: function                         // library function: formatted output to stdout
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extern _atoi: function                           // library function: convert string to integer
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extern _divide_int: function                     // library function: divide intergers (if core has no division instruction)
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_main function public                            // program begins here
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do {                                             // loop to repeat game
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   int64 r0 = address([intro])                   // format string to printf
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   int64 r1 = address([parlist])                 // parameter list
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   int32 [r1] = maxnum                           // put maxnum in parameter list
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   call _printf                                  // printf("\nguess a number 1 - %i\n", maxnum);
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   int32 r0 = read_perf(perf1,1)                 // read CPU clock counter to use as a random number
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   uint32 r0 = abs(r0,1)                         // avoid negative numbers
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   //call _time                                  // or use time as random number
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   // get number modulo maxnum (0 - 99)
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   //uint32 r1 = r0 % maxnum                     // use this if core has division instruction
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   int32 r1 = maxnum
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   call _divide_int                              // this function returns a/b in r0 and a%b in r1
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   int32 r16 = r1 + 1                            // number to guess (1 - 100)
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   for (int64 r17 = 1; ; r17++) {                // loop to guess number. no exit condition here
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      int64 r0 = address([guess])
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      call _puts                                 // write "your guess"
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      int64 r0 = address([buf])
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      int64 r1 = buffersize
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      call _gets_s                               // read input into buffer
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      int64 r0 = address([buf])
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      call _atoi                                 // convert string to integer
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      if (int32 r0 == r16) {break}               // guess is correct. stop 'for' loop
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      if (int32 r16 < r0) {                      // select text: "smaller" or "bigger"
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         int64 r0 = address([smaller])
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      }
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      else {
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         int64 r0 = address([bigger])
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      }
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      call _puts                                 // write "smaller" or "bigger"
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   }
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   // guessing loop is finished
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   int64 r0 = address([conclude])                // format string for printf
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   int64 r1 = address([parlist])                 // parameter list
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   int32 [r1] = r16                              // put guessed number in parameter list
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   int32 [r1+8] = r17                            // put number of tries in parameter list
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   call  _printf                                 // printf("\nyou guessed the number %i in %i tries", r16, r17)
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   int64 r0 = address([another])
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   call  _puts                                   // write "\nanother? (y/n) "
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   int64 r0 = address([buf])
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   int64 r1 = buffersize
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   call  _gets_s                                 // read answer into buffer
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   int8  r0 = [buf]                              // get first character of answer, ignore the rest
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   int8+ r0 |= 0x20                              // convert to lower case
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}
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while (int8 r0 == 'y')                           // repeat 'do' loop if answer is "y"
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int64 r0 = address([goodbye])
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call _puts                                       // write "goodbye"
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int r0 = 0                                       // program return value
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return                                           // return from main
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_main end
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code end

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