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Array initialization

TNT104 (4)
How can i initialize the two variables wiht 0?
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class student{
      private:    
      char *nam;
      float *grades
     public
     student(){grades=...;);
};
ResidentBiscuit (4459)
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grades = 0.0;
nam = '0';
?
Lynx876 (742)
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// class
class student
{
	public:
		student(void);
		~student(void);

	private:
		int *grades;
		char *name;
};

// constructor
student::student(void) : name( "undefined" ), grades( 0 ) // set values here, in the ctor
{
}
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