フレックスとバイソンを使って複素数計算機を作る宿題をしています。しかし、私のプログラムは正しい出力を出すことができません。
.lex ファイル:
%option noyywrap
%{
#include<stdio.h>
#include<stdlib.h>
#include "complex_cal.h"
#define YYSTYPE complex
#include "complex_cal.tab.h"
void RmWs(char* str);
%}
/* Add your Flex definitions here */
/* Some definitions are already provided to you*/
ws [ \t]+
digits [0-9]
number (0|[1-9]+{digits}*)\.?{digits}*
im [i]
complexnum {ws}*[-]*{ws}*{number}{ws}*[+|-]{ws}*{number}{ws}*{im}{ws}*
op [-+*/()]
%%
{complexnum} {RmWs(yytext); sscanf(yytext,"%lf %lf",&(yylval.real),&(yylval.img)); return CNUMBER;}
{ws} /**/
{op} return *yytext;
%%
/* function provided to student to remove */
/* all the whitespaces from a string. */
void RmWs(char* str){
int i=0,j=0;
char temp[strlen(str)+1];
strcpy(temp,str);
while (temp[i]!='\0'){
while (temp[i]==' '){i++;}
str[j]=temp[i];
i++; j++;
}
str[j]='\0';
}
.y ファイル:
%{
#include <stdio.h>
#include <stdlib.h>
#include "complex_cal.h"
/* prototypes of the provided functions */
complex complex_add (complex, complex);
complex complex_sub (complex, complex);
complex complex_mul (complex, complex);
complex complex_div (complex, complex);
/* prototypes of the provided functions */
int yylex(void);
int yyerror(const char*);
%}
%token CNUMBER
%left '+' '-'
%left '*' '/'
%nonassoc '(' ')'
%%
/* start: Add your grammar rules and actions here */
complexexp: complexexp '+' complexexpmultidiv {$$=complex_add($1, $3);}
| complexexp '-' complexexpmultidiv {$$=complex_sub($1, $3);}
| complexexpmultidiv {$$.real=$1.real;$$.img=$1.img;}
;
complexexpmultidiv: complexexpmultidiv '*' complexsimple {$$=complex_mul($1, $3);}
| complexexpmultidiv '/' complexsimple {$$=complex_div($1, $3);}
| complexsimple {$$.real=$1.real;$$.img=$1.img;}
;
complexsimple: '(' complexexp ')' {$$.real=$2.real;$$.img=$2.img;}
| '(' CNUMBER ')' {$$.real=$2.real;$$.img=$2.img;}
;
/* end: Add your grammar rules and actions here */
%%
int main(){ return yyparse(); }
int yyerror(const char* s){
printf("%s\n", s);
return 0;
}
/* function provided to do complex addition */
/* input : complex numbers c1, c2 */
/* output: nothing */
/* side effect : none */
/* return value: result of addition in c3 */
complex complex_add (complex c1, complex c2){
/* c1 + c2 */
complex c3;
c3.real = c1.real + c2.real;
c3.img = c1.img + c2.img;
return c3;
}
/* function provided to do complex subtraction */
/* input : complex numbers c1, c2 */
/* output: nothing */
/* side effect : none */
/* return value: result of subtraction in c3 */
complex complex_sub (complex c1, complex c2){
/* c1 - c2 */
complex c3;
c3.real = c1.real - c2.real;
c3.img = c1.img - c2.img;
return c3;
}
/* function provided to do complex multiplication */
/* input : complex numbers c1, c2 */
/* output: nothing */
/* side effect : none */
/* return value: result of multiplication in c3 */
complex complex_mul (complex c1, complex c2){
/* c1 * c2 */
complex c3;
c3.real = c1.real*c2.real - c1.img*c2.img;
c3.img = c1.img*c2.real + c1.real*c2.img;
return c3;
}
/* function provided to do complex division */
/* input : complex numbers c1, c2 */
/* output: nothing */
/* side effect : none */
/* return value: result of c1/c2 in c3 */
complex complex_div (complex c1, complex c2){
/* c1 / c2 (i.e. c1 divided by c2 ) */
complex c3;
double d;
/*divisor calculation using the conjugate of c2*/
d = c2.real*c2.real + c2.img*c2.img;
c3.real = (c1.real*c2.real + c1.img*c2.img)/d;
c3.img = (c1.img*c2.real - c1.real*c2.img)/d;
return c3;
}
.h ファイル:
#include <string.h>
/* struct for holding a complex number */
typedef struct {
double real;
double img;
} complex;
/* define the return type of FLEX */
#define YYSTYPE complex
ファイルをコンパイルするためのスクリプト:
bison -d -v complex_cal.y
flex -ocomplex_cal.lex.yy.c complex_cal.lex
gcc -o complex_cal complex_cal.lex.yy.c complex_cal.tab.c
./complex_cal
プログラムの正しいサンプル実行:
入力:(5+6i)*(6+1i)
出力:24.000000+41.000000i
入力:(7+8i)/(-3-4i)*(5+7i)
出力:-11.720000-14.040000i
入力:(7+8i)/((-3-4i)*(5+7i))
出力:-0.128108+0.211351i
しかし、このプログラムを実行すると、プログラムは入力と同じ出力しか与えません。たとえば、(5+6i) (6+1i) と入力すると、(5+6i) (6+1i) となります。たとえば「abc」と入力しても、「abc」と表示されるだけで、構文エラーにはなりません。どこに問題があるのか わかりません。解決方法を知りたいと思っています。