How do I call a bool function which has const variables?

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I am trying to call this bool function which has two const variables?
I have tried different ways by changing the order of the variables but nothing seems to work.

What I have tried:

#include <iostream>
#include <cctype>
#include <cstring>
#include <string>
#include <iomanip>
using namespace std;

void displayMenu();
bool verify(const char, const int);


int main(){

	displayMenu();
	const int SIZE = 30;
	char pwd[SIZE];
	cout << "\n\nEnter your password: ";
	cin.ignore();
	cin.getline(pwd, SIZE);

	verify(pwd[SIZE], SIZE);

	//terminate
	return 0;
}

void displayMenu()
{
	const char FILL  = '+';
	const int  WIDTH = 60;
	cout << setfill(FILL) << setw(WIDTH) << "" << endl;
	cout << "Welcome to my password verifier and strength score program!\n";
	cout << "You password must meet all of the following conditions: \n";
	cout << "\t1. Contain at least twelve characters\n";
	cout << "\t2. Contain at least one lowercase letter\n";
	cout << "\t3. Contain at least one uppercase letter\n";
	cout << "\t4. Contain at least one digit\n";
	cout << "\t5. Contain at least one punctuation mark\n";
	cout << "\t6. Cannot contain any whitespace\n";
	cout << setfill(FILL) << setw(WIDTH) << "" << endl;

}
bool verify(const char pwd[], const int SIZE)
{
	for (unsigned i = 0; i <strlen(pwd); i++){
		 return (isdigit(pwd[i]));

	}
	return true;
}

Posted 17-Nov-22 20:00pm

gkau

Updated 18-Nov-22 4:51am

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CPallini · Answer 1 · 2022-11-17T20:20:00

[update]
OOOPS, I overlooked it (thanks, Griff)

The function declaration must (of course) match its definition, so you need to declare verify, the way Griff pointed out:

C++

bool verify(const char pwd[], const int SIZE);

[/update]

Roughly speaking, the const on function parameters are just a promise that passed values are not changed by the function itself. Hence the following code would work fine

C++

int main()
{
  char password[] = "fooboogoo";
  cout << "verify(password) " << verify(password, sizeof(password)) << "\n";
}

That said, your verify function is incomplete and possibly wrong.

OriginalGriff · Answer 2 · 2022-11-17T20:20:00

In C++, arrays use zero based indexes: so the only valid indexes for an array with 3 elements are 0, 1, and 2.
Your code:

	char pwd[SIZE];
...
	verify(pwd[SIZE], SIZE);

Tries to pass the fourth element, if SIZE was 3.

What you need to do is change the forward reference to match the actual declaration, and pass the pointer to the first element:

bool verify(const char[], const int);


int main(){
...
	char pwd[SIZE];
...
	verify(pwd, SIZE);
...
}

bool verify(const char pwd[], const int SIZE)

KarstenK · Answer 3 · 2022-11-17T22:12:00

Solution 3

change the signature of the function to

C++

bool verify(const char *, const int SIZE)

and you should be done.

Posted 17-Nov-22 22:12pm

KarstenK

Rick York · Answer 4 · 2022-11-18T04:51:00

Also note that the const modifier to the integer parameter is unnecessary. Since it is passed by value, the original variable can not be modified anyway since a copy of it was pushed onto the stack. The character pointer parameter requires the const modifier since the pointer is passed to the function so the data it points to could possibly be modified but making that item constant will prevent that.

How do I call a bool function which has const variables?

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