CODEWITHSUNDEEP
c++
Naiem
Naiem

Reputation: 65

How to use array value as a class object name in c++?

I'm trying to use an object name from the array. I know I wrote wrong code below inside the loop. How should I write code on the below pointer lines for using object name from the array?

enter image description here

Here's the full code:

#include <iostream>
using namespace std;

class Students{
    public:
        int index;
        string name;
        string father;
};
int main() {
    string nname[] = {"John", "Doe"};
    string fname[] = {"Ex John Father", "Ex Doe Father"};

    int NarrSize = sizeof(nname)/sizeof(nname[0]); // Size of nname array
    int FarrSize = sizeof(fname)/sizeof(fname[0]); // Size of fname array

    if( NarrSize == FarrSize ){ // Check if both array size is same
       for(int i=0; i<NarrSize; i++){
            Students nname[i];

            nname[i].index  = i+1;
            nname[i].name   = nname[i];
            nname[i].father = fname[i];
        }
    }

  return 0;
}

Upvotes: 0

Views: 577

Answers (1)

MikeCAT
MikeCAT

Reputation: 75062

You should allocate the array before the loop.

Also the name nname is already used as the array of string, so you should give another name to your array of Students.

Using non-standard VLA (variable-length array):

    if( NarrSize == FarrSize ){ // Check if both array size is same
       Students student_array[NarrSize]; // allocate array
       for(int i=0; i<NarrSize; i++){

            student_array[i].index  = i+1;
            student_array[i].name   = nname[i];
            student_array[i].father = fname[i];
        }
    }

Using std::vector instead:

    if( NarrSize == FarrSize ){ // Check if both array size is same
       std::vector<Students> student_array(NarrSize); // allocate vector
       for(int i=0; i<NarrSize; i++){

            student_array[i].index  = i+1;
            student_array[i].name   = nname[i];
            student_array[i].father = fname[i];
        }
    }

Add #include <vector> to use std::vector.

Upvotes: 4

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