error: expected ‘)’ before ‘*’ token

Question

#include<stdio.h>
struct s_{
        int b;
}s;

int func1(s** ss){
        *ss->a = 10;
}
int func(s* t){
        func1(&t);
}
int main(){
        s a;
        func(&a);
        printf("\n a : %d \n",a.b);
        return 0;
}

Trying the sample program and getting an error with the o/p.

o/p:

[root@rss]# gcc d.c
d.c:6: error: expected ‘)’ before ‘*’ token
d.c:9: error: expected ‘)’ before ‘*’ token
d.c: In function ‘main’:
d.c:13: error: expected ‘;’ before ‘a’
d.c:14: error: ‘a’ undeclared (first use in this function)
d.c:14: error: (Each undeclared identifier is reported only once
d.c:14: error: for each function it appears in.)

For one error, read about [operator precedence](http://en.cppreference.com/w/c/language/operator_precedence). For another error, there's no member in the structure named `a`. For yet *another* error, `s` is a variable. — Some programmer dude, Sep 19 '14 at 11:40

score 6 · Accepted Answer · answered Sep 19 '14 at 11:43

You omitted the typedef that you need to declare your struct alias s.
The struct's member is b rather than a.
You failed to return anything from your functions. These should be void functions.
You need parens around ss in func1.
The parameterless main in C is int main(void).

#include <stdio.h>

typedef struct s_{
        int b;
}s;

void func1(s** ss){
        (*ss)->b = 10;
}

void func(s* t){
        func1(&t);
}

int main(void)
{
        s a;
        func(&a);
        printf("\n a.b : %d \n", a.b);
        return 0;
}

6. You should define main as int main(void) for clarity in C. — Jens, Sep 19 '14 at 11:44

Jayesh Bhoi · Answer 2 · 2014-09-19T12:01:00.167

3

After looking your code, it's clear that you missed typedef keyword before struct

struct s_{
        int b;
}s;

should be

typedef struct s_{
        int b;
}s;

and for

*ss->a = 10; //wrong.  operator precedence problem
             // `->` operator have higher precedence than `*`

There is no member name a. It should be

(*ss)->b = 10;

edited Sep 19 '14 at 12:01

answered Sep 19 '14 at 11:41

Jayesh Bhoi

22,676
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score 1 · Answer 3 · edited Sep 19 '14 at 15:32

1

As shown s is an object of type struct s_. You can't use it as a type in the function prototypes. Did you mean to introduce a type alias with typedef?

edited Sep 19 '14 at 15:32

BenMorel

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answered Sep 19 '14 at 11:43

Jens

65,924
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error: expected ‘)’ before ‘*’ token

3 Answers3

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