Does compiler create default constructor when we write our own?

　　

　　In C++, compiler by default creates default constructor for every class. But, if we define our own constructor, compiler doesn’t create the default constructor.

　　For example, program 1 compiles without any error, but compilation of program 2 fails with error “no matching function for call to `myInteger::myInteger()’ ”

　　Program 1

#include<iostream>

using namespace std;

class myInteger
{
private:
int value;

//...other things in class
};

int main()
{
myInteger I1;
getchar();
return 0;
}

　　Program 2

#include<iostream>

using namespace std;

class myInteger
{
private:
int value;
public:
myInteger(int v)  // parametrized constructor
{  value = v;  }

//...other things in class
};

int main()
{
myInteger I1;
getchar();
return 0;
}

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　　2013-11-26　　10:11:05