Pass a string by reference

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Join Date: Sep 2007

Posts: 17

Reputation: BigFormat is an unknown quantity at this point

Rep Power: 2

Solved Threads: 0

BigFormat

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Pass a string by reference

May 8th, 2008

I have to pass a string to a function that strcats something to it, in K&R I read to pass a pointer to it, but I don't know where to allocate buffer...
Is there a difference betw passing an empty string or not?
My printf starts with some strange symbols, and then the string...

 Help with Code Tags 
 c Syntax (Toggle Plain Text) 
int main()  {
 
    char *string;
 
    //here or in string_concat? or both?
    string = (char*) malloc(16 * sizeof(char)); 
 
    string_concat( &string );
 
    printf("%s", string);
 
    return 0;
}
 
 
void string_concat( char **string )  {
 
    //write in string something, need a realloc?
    strcat(*string, something);    
 
}
int main()  {
    
    char *string;

    //here or in string_concat? or both?
    string = (char*) malloc(16 * sizeof(char)); 

    string_concat( &string );

    printf("%s", string);

    return 0;
}


void string_concat( char **string )  {
    
    //write in string something, need a realloc?
    strcat(*string, something);    

}