Can someone tell me how variable definitions work?

Question

I need help on this assignment for school.

Answer 1

#include <iostream>

using namespace std;

int main() {
//declares 5 variables. Their types are int, float, double, char, and bool. Their names are i, flt, dbl, ch, and b.
int i;
float flt;
double dbl;
char ch;
bool b;

//sets their values (initializes). You need to remember to use the right data type.
i = 5;
flt = 3.14;
dbl = 3.1415926;
ch = ‘$’;
b = false;

//you can also declare and initialize at the same time:
int hi = 6;

//now, using them:
cout << i << endl;
//outputs 5

//you can change their values after initializing:
i = 156;
cout << i << endl;
//outputs 156
}

Answer 2

What do you need to know about them?
Just how to declare a variable or something specific?

Answer 3

to declare variable tell compiler the name and type of variable but to define variable give every thing about variable and allocate space for it

Answer 4

I guess how how to declare a variable.