An error occurred while initializing data members.

Ken H

12y2k

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

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.

4 Replies

Know the answer? Post it — somebody with the same question will find it here.

Vulpes12y ago
Accepted 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.
Ken H12y ago
Thank very much,Vulpes. :)
Ken H12y ago
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 < COURSE_NUM; i++) score[i]=000.0f;
}

void Student::ResetScore(int index,int new_score)
{
this->score[index]=new_score;
}
void Student::print()
{
int i;
for (i=0;icout<}
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;
}
Vulpes12y ago
To initialize all elements of the array to zero, I'd use this code:

Student::Student(){
for(int i = 0; i < COURSE_NUM; i++) score[i] = 0.0;
}