all,
I have the following code written for an assignment and it works great in DevC++. However, when using
gcc -Wall -ansi -o pa6 animal.c
I get a segmentation fault when trying to run the program. Can someone point me in the right direction?
I apologize in advance for the horrible formatting.
Code:#include <stdlib.h> #include <stdio.h> #include <assert.h> #include <string.h> #ifndef EleType #define EleType char #endif struct node { char * value; struct node * left; struct node * right; }; struct node * newAnimalTree() { struct node * animalTree = (struct node *)malloc(sizeof(struct node)); assert (animalTree !=0); animalTree->value= "Cat\n"; animalTree->left = 0; animalTree->right = 0; return animalTree; }; struct node * newLeftNode(struct node * current, EleType * newValue) { struct node *node=(struct node *)malloc(sizeof(struct node)); current->left=node; node->value = newValue; node->left = 0; node->right = 0; return current; } ;/*end newLeftNode*/ struct node * newRightNode(struct node * current, EleType * newValue) { struct node *node=(struct node *)malloc(sizeof(struct node)); current->right=node; node->value = newValue; node->left = 0; node->right = 0; return current; } ;/*end newRightNode*/ char * newStr (char * charBuffer) { char * p = (char *) malloc(1 + strlen(charBuffer)); strcpy (p, charBuffer); return p; };/*end newStr*/ struct node *readATree (FILE * f) { char c, buffer[100]; struct node * newTree = (struct node *) malloc(sizeof(struct node)); c = fgetc(f); fgets(buffer, 100, f); if (c == 'A'){ newTree->value = newStr(buffer); newTree->left=0; newTree->right=0; } else { newTree->value = newStr(buffer); newTree->left = readATree(f); newTree->right = readATree(f); } return newTree; }; void writeATree (struct node * tree, FILE *f) { if(tree != 0) { if(tree->left !=0) fputc('Q', f); else fputc('A', f); fputs(tree->value, f); writeATree(tree->left, f); writeATree(tree->right, f); }/*end if*/ }; /*end writeATree*/ int main() { char buffer[100]; FILE * f; struct node * current; struct node * animalTree; char *animal; char *question; printf("Think of an animal\n"); f = fopen("animal.txt", "r"); if(f !=0) { animalTree = readATree(f); } else { animalTree=newAnimalTree(); } fclose(f); current= animalTree; while(current != 0) { if(current->left !=0) { printf("%s", current->value); fgets(buffer, 100, stdin); if(buffer[0] == 'Y' || buffer[0] == 'y') { current = current->left; }/*end inner if*/ else { current = current->right; }/*end else*/ }/*end outer if*/ else { printf("Im going to guess %s", current->value); fgets(buffer, 100, stdin); if(buffer[0] == 'Y' || buffer[0] == 'y') { printf("I am the winner!\n"); getchar(); return 0; }/*end if*/ else { printf("Im stumped. What animal was it?\n"); fgets(buffer, 100, stdin); animal = newStr(buffer); printf("Give a yes/no question that that is true of %s but not true of %s", current->value, animal); fgets(buffer, 100, stdin); question = newStr(buffer); /*create new nodes for animals*/ newLeftNode(current, current->value); newRightNode(current, animal); current->value = question; /*write to file */ f= fopen("animal.txt", "w"); writeATree(animalTree, f); return 0; }/*end else*/ }/*end outer else*/ }/*end while*/ return 0; }
