CODEWITHSUNDEEP
c++variables
Mophotla
Mophotla

Reputation: 127

Defining variables with dependent names

I want to define variables whose names depend on the values of other variables, such as

for (int i = 0; i < 5; i++) {
    int v_i = 2 * i
}

std::cout << v_3; // output: 6

or

int m;
std::cin >> m; // m = 42

int v_m = 10;

std::cout << v_42; // output: 10

Of course, these examples do not work but instead just create variables with the names v_i or v_m, treating i and m as characters.

How could I accomplish this?

Upvotes: 1

Views: 57

Answers (1)

Winter
Winter

Reputation: 4093

You can use an associative map. It lets you associate a key with a value and then access a value from that key.

http://www.cplusplus.com/reference/map/map/

Example:

int main ()
{
  std::map<char,int> test;

  test['a']=10;
  test['b']=30;
  test['c']=50;
  test['d']=70;

  std::cout << test['a'] << std::endl; //prints 10
}

In your case, it would be a map<int, int>

Maps are also known as Dictionnary in some other languages.

Upvotes: 1

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