CODEWITHSUNDEEP
c++arrays
samkit
samkit

Reputation: 79

Crash while declaring Array of class objects

I want to declare an array of class objects for my utility. I tried declaring as below but am getting an exception. Not able to understand what am I doing wrong. here is the code section.

#include<iostream>
#include<conio.h>

using namespace std;

struct charFreqPair{
public: charFreqPair();
        charFreqPair(char,int);
        ~charFreqPair(){}
        char ch;
        int freq;
};

charFreqPair::charFreqPair(){

}

charFreqPair::charFreqPair(char c , int f){
    ch = c;
    freq = f;
}


int main(int argc , char **argv){
    char *string;
    cout<<"Enter String"<<endl;
    cin>>string;
    charFreqPair array[128] ;
    getch();
}

If I run the above code by commenting : charFreqPair array[128] ; everything works fine. But if I run the above code as it is , it's throwing following exception:

First-chance exception at 0x00d31556 in String1.exe: 0xC0000005: Access violation writing location 0x00d320fd.

I am not able to understand what am I doing wrong in declaring array of class object.

Upvotes: 0

Views: 84

Answers (2)

Jack
Jack

Reputation: 133577

The error is not caused by the array but by the fact that you are using cin to save the input into a uninitialized pointer:

char *string;
cin>>string;

char *string is not initialized so dereferencing it causes the exception. Use a std::string as you should:

std::string;
cin >> string;

Upvotes: 2

bosnjak
bosnjak

Reputation: 8614

You can not just write to a pointer that is not pointing anywhere. No wonder you are getting exceptions, you are writing on random memory. Allocate your string before using it.

Upvotes: 1

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