programs/stringConstructor.cpp at main · Naveen2464/programs · GitHub

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#include<iostream>
using namespace std;
#include<string.h>
class String
{
    char* cStr;
    int len;
    public:
    String()
    {
        cout<<"default constructor is called \n";

        cStr=NULL;
        len=0;

    }
    String(const char* p)
    {
        cout<<"parameterised constructor is called\n";

        if(p==NULL)
        {
            cStr=NULL;
            len=0;

        }
        else
        {
            len=strlen(p);
            this->cStr=new char[len+1];
            strcpy(cStr,p);
        }
    }
    String(const String& ss)
    {
        cout<<"copy constructor is called \n";

        if(ss.cStr==NULL)
        {
            cStr=NULL;
            len=0;
        }
        else
        {
            len=strlen(ss.cStr);
            cStr=new char[len+1];
            strcpy(cStr,ss.cStr);

        }
    }
    char* getString()
    {
        if(cStr==NULL)
        {

            cout<<"string is empty\n";
            return NULL;
        }
        return cStr;

    }
    ~String()
    {
        delete []cStr;
    }
};

int main()
{
    String s1("NAVEEN");
    String s2=s1;   //s2(s1) both are same
    String s3;


    cout<<s1.getString()<<endl;
    cout<<s2.getString()<<endl;
    cout<<s3.getString()<<endl;
    return 0;
}