rand() gives the same number through out my program

[Bubiche]

I have a Task class which looks like this

#include <string>
#include <time.h>
#include <stdlib.h>
using namespace std;

class Task
{
private:
	string name;
	int time_of_completion;
public:
	Task();
};

and here is the default constructor

Task::Task()
{
	srand(time(NULL));
	name = "";
	time_of_completion = (rand()%10 + 1)*10;
}

My problem is that whenever I initialize a task in my program, it gets the same number for time_of_completion again and again. Each program run gets a new random number for time_of_completion but that number will say the same through out each run.
Example: if I have Task a,b,c; in my main program then a,b,c will have the same time_of_completion no matter what.
Can you please help me with how to make each new task will be initialized with a new random time_of_completion.
Thank you for your time and patience

[JLBorges]

Remove the call to srand() from the constructor.

Call srand() once, in main(), at the start of your program.

[Bubiche]

Thank you very much, my program now works perfectly.
Did a little research and found out that if I put the srand(time(NULL)) in the constructor it'll be called many times at the same second and gives me the same value for rand()