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
1 #include<iostream>
2
3 using namespace std;
4
5 class myInteger
6 {
7 private:
8 int value;
9
10 //...other things in class
11 };
12
13 int main()
14 {
15 myInteger I1;
16 getchar();
17 return 0;
18 }
Program 2
1 #include<iostream>
2
3 using namespace std;
4
5 class myInteger
6 {
7 private:
8 int value;
9 public:
10 myInteger(int v) // parametrized constructor
11 { value = v; }
12
13 //...other things in class
14 };
15
16 int main()
17 {
18 myInteger I1;
19 getchar();
20 return 0;
21 }
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2013-11-26 10:11:05