Question

Being new to c++ I’ve been practicing with questions. One program I wrote includes the use of structs and arrays:

#include <iostream>
using namespace std;

int main (void){
struct CandyBar{
    char brandName[200];
    float weight;
    int calories;
};

CandyBar snacks[3] = {
    {"Cadbury's Flake",23.5,49},
    {"Cadbury's Wispa",49.3,29},
    {"Cadbury's Picnic",57.8,49},
};

for(int i=0;i<3;i++){
    cout << "Brand Name: " << snacks[i].brandName << endl;
    cout << "Weight: " << snacks[i].weight << endl;
    cout << "Calories: " << snacks[i].calories << endl;
    snacks++;
}

cin.get();
return 0;
}

The above program fails becuase of the “snacks++”, but I can’t understand why. As I understand arrays they are made of two parts the pointer (“snacks”) and the object ([]), so shouldn’t the “snacks++” work as I am incrementing the pointer?

Thanks
Dan

Answer 1

just remove the snacks++;
you are already using the variable i as a index in the array.

if you do want to use a pointer arithmetics:
a. you should define a pointer to the start of the array and work with it rather then work with the array.
b. you should use a pointer instead of the array with index i when accessing the data.

struct CandyBar* ptr = snacks;
for(int i=0;i<3;i++){
    cout << "Brand Name: " << ptr->brandName << endl;
    cout << "Weight: " << ptr->weight << endl;
    cout << "Calories: " << ptr->calories << endl;
    ptr++;
}