Thread: the length of a string code

hi everyone,
I am very new in C++ so I don't have much of knowledge about the language. The question is I have promoted my new program to enter 12 characters. So, now I want to check if the user have entered 12 characters exactly not less and not more. The code will include some numbers with some letters EX ( 345D3CC123FA ). How I can do that ? I know that I am going to use If statement but in the condition EX ( if ( my condition) ) I don't know how to tell the check if the user entered 12 characters or not... I hope it is clear..

What data type are you reading your string into? Does it have a built-in length function?

I don't know excatly what do you mean but this is all what I have gotten so far!

Code:

#include<string>
using namespace std;

	String i;
	int n;
	char codeRange[11];

	

int main()
{
  	cout<< "please enter a serial number of 12 characters:";
	cin >> i;
	
	if (i.length)
	{
   // code to execute if condition is true
	}
	else 
	{
   // code to execute if condition is false
	}

Well, what do you want to be true about i.length? That's what needs to go in the if () part.

Try this:

Code:

	if (i.length()==12)

Todd

I have completed my program but it has this Error E2379 CokeRewardCodes.cpp 18: Statement missing ; in function main()
where is the error in this code ?

Code:

 
#include <iostream>
#include<string>
using namespace std;

int main()
{
   string i; 
	int length=0;	
	cout<< "please enter a serial number of 12 characters:";
	cin >> i;
	length=i.length();
	
	if (length!=12 )
		cout << "The code you have entered cannot be processed because the code must be contained of 12 characters exactly";
	else (length == 12)
		cout << " that's correct code";

	return 0;
}

You meant "else if (length == 12)", but you could just write "else" since you already know in that case that length == 12.

This is starting to become an epidemic.

Code:

else (length == 12)

I didn't get line 18 when I counted, but who knows. Anyway, there's no reason to put a condition on an else statement, because an else statement doesn't need a condition. It's everything else, that is, everything that didn't make the first if true. So remove the condition length==12.

yeah that's right .. thanks so much the program is working!