Question

How to use struct with methods and constructor in C++

Answer 1

#include <iostream>

using namespace std;
 
struct ST {
  int num;
  ST() : num(845) {} // constructor
  int get_num() { 
      return num; 
  }
};


int main () {
    ST s;
    cout << s.get_num();

    return 0;
}



/*
run:
 
845
 
*/

 

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Answer 2

#include <iostream>

using namespace std;
 
struct ST {
  int num;
  ST() {} // constructor
  int get_num() { 
      return num; 
  }
};


int main () {
    ST s;
    cout << s.get_num();

    return 0;
}



/*
run:
 
32767
 
*/

 

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Answer 3

#include <iostream>

using namespace std;
 
struct ST {
  int num;
  int get_num() { 
      return num; 
  }
  void set_num(int n) { 
      num = n; 
  }
};


int main () {
    ST s;
    
    s.set_num(999);
    
    cout << s.get_num();

    return 0;
}



/*
run:
 
999
 
*/

 

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Answer 4

#include <iostream>

using namespace std;
 
struct ST {
  int num;
  ST(int n) : num(n) {} // constructor
  int get_num() { 
      return num; 
  }
  void set_num(int n) { 
      num = n; 
  }
};


int main () {
    ST s(8271);

    cout << s.get_num();

    return 0;
}



/*
run:
 
8271
 
*/

 

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