rnd01.c

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/*****************************************************************************
 * ugBASIC - an isomorphic BASIC language compiler for retrocomputers        *
 *****************************************************************************
 * Copyright 2021-2026 Marco Spedaletti (asimov@mclink.it)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
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/****************************************************************************
 * INCLUDE SECTION 
 ****************************************************************************/
 
#include "../../ugbc.h"
 
/****************************************************************************
 * CODE SECTION 
 ****************************************************************************/
 
extern char DATATYPE_AS_STRING[][16];

/* <usermanual>
@keyword RND(0)
 
@english
The function ''RND(0)'' generates pseudo random floating point numbers in the range of 0.0 (inclusive) 
to 1.0 (exclusive). By using ''RND(0)'', it gives a different random number each time from a 
predetermined sequence (the sequence number is stored internally).
 
@italian
La funzione ''RND(0)'' genera numeri in virgola mobile pseudocasuali nell'intervallo da 0,0 (incluso)
a 1,0 (escluso). Utilizzando ''RND(0)'', viene fornito ogni volta un numero casuale diverso da una 
sequenza predeterminata (il numero di sequenza è memorizzato internamente).
 
@syntax = RND(0)
 
@example value = 42.0 * RND(0)
 
@usedInExample tsb_block_rec_01.bas
 
@target all
</usermanual> */
Variable * rnd0( Environment * _environment ) {
 
    MAKE_LABEL
 
    char endLabel[MAX_TEMPORARY_STORAGE]; sprintf(endLabel, "%send", label );
    char lastRandomLabel[MAX_TEMPORARY_STORAGE]; sprintf(lastRandomLabel, "%slr", label );
 
    Variable * maxValue = variable_temporary( _environment, VT_WORD, "(maxValue)");
    variable_store( _environment, maxValue->name, 0x7fff );
    Variable * maxValueFloat = variable_cast( _environment, maxValue->name, VT_FLOAT );
    Variable * randomNumberInteger = variable_and_const( _environment, random_value( _environment, VT_WORD )->name, 0x7fff );
    Variable * randomNumberFloat = variable_cast( _environment, randomNumberInteger->name, VT_FLOAT );
    Variable * result = variable_div( _environment, randomNumberFloat->name, maxValueFloat->name, NULL );
    
    return result;
 
}
 
/* <usermanual>
@keyword RND(1)
 
@english
The function ''RND(1)'' generates pseudo random floating point numbers in the range of 0.0 (inclusive) 
to 1.0 (exclusive). By using ''RND(1)'', it gives a different random number each time from a 
predetermined sequence (the sequence number is stored internally).
 
@italian
La funzione ''RND(1)'' genera numeri in virgola mobile pseudocasuali nell'intervallo da 0,0 (incluso)
a 1,0 (escluso). Utilizzando ''RND(1)'', viene fornito ogni volta un numero casuale diverso da una 
sequenza predeterminata (il numero di sequenza è memorizzato internamente).
 
@syntax = RND(1)
 
@example value = 42.0 * RND(1)
 
@usedInExample tsb_block_rec_01.bas
 
@target all
</usermanual> */
Variable * rnd1( Environment * _environment ) {
 
    MAKE_LABEL
 
    char endLabel[MAX_TEMPORARY_STORAGE]; sprintf(endLabel, "%send", label );
    char lastRandomLabel[MAX_TEMPORARY_STORAGE]; sprintf(lastRandomLabel, "%slr", label );
 
    Variable * maxValue = variable_temporary( _environment, VT_WORD, "(maxValue)");
    variable_store( _environment, maxValue->name, 0x7fff );
    Variable * maxValueFloat = variable_cast( _environment, maxValue->name, VT_FLOAT );
    Variable * randomNumberInteger = variable_and_const( _environment, random_value( _environment, VT_WORD )->name, 0x7fff );
    Variable * randomNumberFloat = variable_cast( _environment, randomNumberInteger->name, VT_FLOAT );
    Variable * result = variable_div( _environment, randomNumberFloat->name, maxValueFloat->name, NULL );
    
    return result;
    
}