CODEWITHSUNDEEP
carrayspointersstruct
Sairam Saladi
Sairam Saladi

Reputation: 49

stack storing struct pointers in c

The program is supposed to implement stack for storing and retrieving struct pointers. The struct contains one int and two struct variables. Push function is working fine but when i pop the struct pointer and try to access data in it there is an execution error.

#include<stdio.h>
#include<malloc.h>
#define MAX 10
struct node *arr[MAX];
int top=-1;
struct node* pop(){
    if(top=-1)
        return NULL;
    else{
        return arr[top--];
    }
}
void push(struct node* d){
    if(top==MAX-1)
        return;
    else{
        arr[++top]=d;
    }
}
int main(){
    struct node* t = (struct node*)malloc(sizeof(struct node));
    t->data=9;
    push(t);
    printf("%d",pop()->data);
    return 0;
}

Upvotes: 2

Views: 644

Answers (1)

Arun A S
Arun A S

Reputation: 7006

if( top = -1)

should be

if( top == -1 )

With = you are assigning -1 to top. To check for equality, use ==.

Upvotes: 7

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