string exercise

[RLC]

I have written a small program to try to use string input. I have some errors:
lines 6, 18, and 23.

// Exercise in string manipulation

#include <iostream>
#include <string>

void prtname(str);

using namespace std;

int main()
{
	string input;

	cout << "Please enter the name of a bird with long legs: ";

	cin >> input;

	prtname(input);

	return 0;
}

void prtname(str)
{
	cout << "The birds name is: " << str;
}

[firedraco]

void prtname(str);

Do you know how to declare/define a function? You should go look it up.

[RLC]

The only thing I can see is str is untyped? This is the beginner's forum, isn't it?

[TwilightSpectre]

Yes, because "str" is not given a type, the program doesn't know what type to give it. This is probably what you wanted to do:

#include <iostream>
#include <string>

void prtname(std::string str);

int main() {
    std::string input;

    std::cout << "Please enter the name of a bird with long legs: ";
    std::cin >> input;

    prtname(input;

    return 0;
}

void prtname(std::string str) {
    std::cout << "The bird's name is: " << str;
}

Just in case you didn't know, std::string, std::cout etc. are the same as normal, it is just what you type if you don't use the std namespace. In general, its better to avoid using namespace std;, because it leads to some errors that may not be obvious, such as if you declare a global variable called "left" or something.

[RLC]

Everything worked. Thanks for giving me some direction an some advice. I'll remember it.

[RLC]

I spoke to soon. This line: cout << "The birds name is: " << str; only displays the first word in the string.
This line: cout << "The lenght of the name is: " << str.length();
only displays the length of the first word.

// Exercise in string manipulation

#include <iostream>
#include <string>

void prtname(std::string str);

using namespace std;

int main()
{
	string input;

	cout << "Please enter the name of a bird with long legs: ";

	cin >> input;

	prtname(input);

	return 0;
}

void prtname(std::string str)
{
	cout << "The birds name is: " << str;
	cout << "The lenght of the name is: " << str.length();
}

[TwilightSpectre]

Ah, thats because "cin" only takes in up to the first space, tab or linefeed. If you want to get everything up to the new line, use getline, like this:

#include <iostream>
#include <string>

void prtname(std::string str);

int main() {
	std::string input;

	std::cout << "Please enter the name of a bird with long legs: ";
	std::getline(std::cin, input);

	prtname(input);

	return 0;
}

void prtname(std::string str)
{
	std::cout << "The birds name is: " << str << std::endl;
	std::cout << "The lenght of the name is: " << str.length() << std::endl;
}

That should work.

[EDIT] Fixed formatting errors

[RLC]

Yes, that works fine. I have been using arrays, pointers, and etc (c style) to manipulate strings. It looks like using strings are a little easier.
Thanks

// Exercise in string manipulation

#include <iostream>
#include <string>

void prtname(std::string str);

using namespace std;

int main()
{
	std::string input;

	std::cout << "Please enter the name of a bird with long legs: ";

	std::getline(std::cin, input);

	prtname(input);

	return 0;
}

void prtname(std::string str)
{
	std::cout << "The birds name is: " << str << std::endl;
	std::cout << "The lenght of the name is: " << str.length() << std::endl;
}