An error occurred while initializing data members.

Question

Hello friend,

I tried on a class member data error occurred while initializing.

System prompts an error message:error C2059: syntax error : '{'

error C2143: syntax error : missing ';' before '{'

error C2143: syntax error : missing ';' before '}'

My codes is as follows:

#include<iostream>

using namespace std;

#define COURSE_NUM 4

class Student

{

public:

Student();

void ResetScore(int index,int new_score);

private:

float score[COURSE_NUM];

};

Student::Student(){

this->score[COURSE_NUM]={0.0}; // Attempting to initialize the array.

}

void Student::ResetScore(int index,int new_score)

{

this->score[index]=new_score;

}

int main()

{

Student stu;

stu.ResetScore(1,98.5);

return 1;

}

Thanks.

Vulpes · Answer

1. The reason why you're getting 98 is because the second parameter to the ResetScore method is an int, not a float. The argument of 98.5 is therefore rounded to 98. If you change it to a float, then it will work fine. 2. The difference is that you're initializing the float array where it's defined. Previously, you'd declared it as a data member of the Student class but were attempting to initialize it in the constructor but you can't use the {...} syntax for that.

Vulpes · Answer

To initialize all elements of the array to zero, I'd use this code: Student::Student(){ for(int i = 0; i }

Ken H · Answer

Thank very much,Vulpes. :)

Ken H · Answer

Thank for your help. But i have two questions: 1) #include using namespace std; #define COURSE_NUM 4 class Student { public: Student(); void ResetScore(int index,int new_score); void print(); private: float score[COURSE_NUM]; }; Student::Student(){ for(int i = 0; i } void Student::ResetScore(int index,int new_score) { this->score[index]=new_score; } void Student::print() { int i; for (i=0;i cout } int main() { Student stu; stu.ResetScore(1,98.5); stu.print(); return 1; } The result is: 0 98 0 0 I think the result should be: 0 98.5 0 0 2) Why it can not accept this way to initialize an array? However, in the following procedure by the same method is allowed. #include using namespace std; #define COURSE_NUM 4 int main() { float test[COURSE_NUM]={0.0}; int i; for(i=0;i cout return 1; }