I am doing a homework using flex and bison to make a complex number calculator. But my program cannot give a correct output.

.lex file:

%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 file:

%{
#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 file:

#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

Script for compiling the file:

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

Some correct sample run of the program:

input:(5+6i)*(6+1i)

output:24.000000+41.000000i

input:(7+8i)/(-3-4i)*(5+7i)

output:-11.720000-14.040000i

input:(7+8i)/((-3-4i)*(5+7i))

output:-0.128108+0.211351i

But when I run this program, the program only give an output which is identical to my input. For example, when I input (5+6i)(6+1i), it just gives (5+6i)(6+1i). Even if I input any other things, for example, input "abc" it just gives "abc" and is not syntax error. I don't know where the problem is and I hope to know how to solve it.