this question has answer here:
- how correctly assign new string value? 3 answers
hi trying insert char *keyin = null , char *valuein = null; binary search tree, error message appears like： yelp1.c:111:11: error: assignment expression array type r->name = key; ^ yelp1.c:112:11: error: assignment expression array type r->data = value; how should modify this? here part of code:
#include <stdio.h> #include <stdlib.h> #include <string.h> #define maxnamelenth 64 #define maxdatalenth 1465 typedef struct node { char name[maxnamelenth]; char data[maxdatalenth]; struct node* left; struct node* right; }node; node* root; node* search(node ** tree, char *key, int count, file *fp_out); node* insertion(node* r, char *key, char *value); void deltree(node * tree); char* strtok_r(char *str, const char *delim, char **nextp); int main(int argc, char *argv[]) { node *root; node *tmp; file *fp; file *outputfile; file *keyfile; file *fp_key; int i; int counter = 0; int bufsize = maxdatalenth + maxnamelenth; int keyfilelen = maxnamelenth; char *keyread; char *buffer,*saveptr; char *line = null; char *keyin = null; char *valuein = null; char inputkey[maxnamelenth]; char *target_key = null; char *keyline = null; root = null; /* inserting nodes tree */ buffer = (char *)malloc(bufsize * sizeof(char)); if (buffer == null) { exit(1); } fp = fopen(argv[1], "r"); outputfile = fopen("outputfile.txt", "a"); while (1) { fgets(line, bufsize, fp); buffer = line; keyin = strtok_r(buffer, ",", &saveptr); valuein = strtok_r(null, "\0", &saveptr); insertion(root, keyin, valuein); } node* insertion(node* r, char *key, char *value) { if(r==null) // bst not created created { r = (struct node*) malloc(sizeof(struct node)); // create new node // insert data new node r->name = key; r->data = value; // make left , right childs empty r->left = null; r->right = null; } // if data less node value must put in left sub-tree else if(strcmp(key, r->name) < 0){ r->left = insertion(r->left, key, value); } // else in right subtree else if (strcmp(key, r -> name) > 0){ r->right = insertion(r->right, key, value); } else { if(strcmp(value, r -> data) > 0){ r -> left = insertion(r -> left, key, value); } else if(strcmp(value, r->data) < 0){ r -> right = insertion(r->right, key, value); } } return r; }
the error message means you're trying assign pointer array:
r->name = key; r->data = value; r->name , r->data arrays; cannot assign directly array, instead element of array.
instead direct assignment, try following, long guaranteed length of key less maxnamelength , length of value less maxdatalength:
strcpy(r->name, key); strcpy(r->data, value); 
Comments
Post a Comment