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thedustbustr

a stupid C struct compiler error (resolved)

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gcc -ansi -pedantic -Wall -g -lm -o p3 p3.c
p3.c: In function 'list_insert':
p3.c:42: error: 'new' undeclared (first use in this function)
p3.c:42: error: (Each undeclared identifier is reported only once
p3.c:42: error: for each function it appears in.)
p3.c:43: error: expected expression before ')' token
make: *** [p3] Error 1

struct list_element { float element; struct list_element* next;};
typedef struct list_element node;

node* list_insert(node* node, float value){
    node* new;
    new=(node*)malloc(sizeof(node*));
    new->element=value;
    if (node) { /* needs to be atomic */
        new->next=node->next;
        node->next=new;
    } else { 
        new->next=NULL;
        node=new;
    }
    return node;
}
PS why isn't there a standard list like there is in C++? I freaking hate having to write my own little list in C land because my alg needs one.

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here it is in MSVC8

p3.c(42) : error C2065: 'new' : undeclared identifier
p3.c(42) : error C2296: '*' : illegal, left operand has type 'node *'
p3.c(43) : error C2059: syntax error : ')'
p3.c(44) : error C2223: left of '->element' must point to struct/union
p3.c(46) : error C2223: left of '->next' must point to struct/union
p3.c(47) : warning C4047: '=' : 'list_element *' differs in levels of indirection from 'int'
p3.c(49) : error C2223: left of '->next' must point to struct/union
p3.c(50) : warning C4047: '=' : 'node *' differs in levels of indirection from 'int'

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I know it's C, but you might want to try not using a word that's reserved in C++. i.e. not 'new' but use 'newNode'.

otherwise:


new=(node*)malloc(sizeof(node*));



should be

new=(node*)malloc(sizeof(node));



-me

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This:
Quote:
my error was trying to have a local variable 'node' when i already have a global struct 'node'. go me.
in addition to:
Quote:
PS why isn't there a standard list like there is in C++? I freaking hate having to write my own little list in C land because my alg needs one.
is why C is very much disliked.

C simply doesn't have some things. Like a useful standard library. Or namespaces.

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