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我正在做一個使用flex和野牛做作業的複雜數字計算器。但是我的程序無法給出正確的輸出結果。flex和野牛：錯誤的輸出
.lex文件：
%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文件：
%{
#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文件中：
#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
腳本編譯文件：
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
程序的某些正確的樣品運行：
輸入：（5 + 6I）*（6 + 1i）中
輸出：24.000000 + 41.000000i
輸入：（7 + 8I）/（ -3-4i）*（5 + 7I）
輸出：-11.720000-14.040000i
輸入：（7 + 8I）/（（ - 3-4i）*（5 + 7I））
輸出：-0.128108 + 0.211351i
但是當我運行這個程序時，程序只給出與我的輸入相同的輸出。例如，當我輸入（5 + 6i）（6 + 1i）時，它只是給出（5 + 6i）（6 + 1i）。即使我輸入任何其他東西，例如輸入「abc」，它只會給出「abc」，而不是語法錯誤。我不知道問題出在哪裏，我希望知道如何解決問題。
當你接受對你最有幫助的答案時，你1.獲得+2代表和2.向其他人表明你的問題得到了滿意的答案。之後，當您的代表人數超過15人時，您可以提高您認爲「良好」的答案。 –