c++ how to use while properly [closed] - c++

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I am learning c++ around two weeks and therefore have a lot of questions. It feels like i learn a new sport. My body in my thinking already moving much better than any other olympic players, but the actual movement is so poor.
what i want to know is if i can use "while" in cout together.
int main() {
struct {
string engineType;
string brand;
int price;
int range;
} candidate1, candidate2;
// information of candidate 1
candidate1.name = "IONIQ5";
candidate1.range = 450;
candidate1.price = 35000;
// information of candidate 2
candidate2.brand = "Tesla_Model_3";
candidate2.range = 650;
candidate2.price = 55000;
// show each price with while function
int i = 1;
while (i<3) {
cout << "Price :" << candidate[i].range << endl ;
i++;
}
return 0;
I want to have as a result of print
450
650
what do i have to do to get it ?
Thanks for the help !

Answer 1

Use an array and initialize it.
First you need to name your structure:
struct candidate {
std::string engineType;
std::string brand;
int price;
int range;
};
Then create and initialize the array:
std::array<candidate, 2> candidates = {
{ "Electric", "IONIQ5", 35000, 450 },
{ "Electric", "Tesla_Model_3", 55000, 650 }
};
And finally iterate over it:
for (auto const& candidate : candidates) {
std::cout << "Price: " << candidate.price << '\n';
}
All this should be well-covered in a decent book.

Answer 2

You can use an array with elements of type Candidate and then loop through the array and print the values as shown below:
//class representing a Candidate info
struct Candidate{
string engineType;
string brand;
int price;
int range;
};
int main() {
//create an array witht element of type Candidate;
Candidate arr[] = {{"IONIQ5", "Honda", 450, 3500}, {"Tesla_Model_3", "Tesla", 650, 55000}};
//iterate through the array using range based for loop
for(const Candidate& candidate: arr)
{
std::cout<<candidate.range<<std::endl;
}
}
Working demo

Answer 3

You cannot use candidate1 like candidate[i] because it works as a variable name . You need to use maps or arrays for this type of tasks.

Answer 4

You are declaring 2 separate variables, called candidate1 and candidate2 as an array, so candidate[i] does not resolve to anything.
You need to initialize the array as follows:
main ()
{
struct
{
string engineType;
string brand;
int price;
int range;
} candidate[3];
// information of candidate 1
candidate[1].brand = "IONIQ5";
candidate[1].range = 450;
candidate[1].price = 35000;
// information of candidate 2
candidate[2].brand = "Tesla_Model_3";
candidate[2].range = 650;
candidate[2].price = 55000;
// show each price with while function
int i = 1;
while (i < 3)
{
cout << "Price :" << candidate[i].range << endl;
i++;
}
return 0;
}
Please note that arrays start with 0, so an array of 3 will have values for postitions 0, 1, 2, hence the candidate[3], but I would recommend going with candidate[2] and setting values for positions 0 and 1.