Simple code isn't compiling

[MysteryFlavour]

Hey y'all, this simple code I've been working on isn't running on visual studio. I'm not sure why, although it stopped working after I attempted the for loop. Thanks!

  #include <iostream>
using namespace std;

int main()
{
	string name;
	int age;
	string country;
	int answerOneNoYes;

		std::cout << "Please enter your name: \n";			// asks user for their name
		std::cin >> name;									// stores their name

		std::cout << "Hello " << name << "!" << std::endl;  // greets user with stored name
		std::cout << "Please enter your age: \n";			// asks the user for their age
		std::cin >> age;									// stores their age
		
		std::cout << "Lastly, enter your country: \n";		// asks the user for their country
		std::cin >> country;								// stores their country

		// concludes a message with all of the stored info & asks the user for verification
		std::cout << "Thanks for the info.\n" << "Your name is " << name << ", you're from " << country << ", and you're " << age << " years old. Is that correct? Type '1' for yes or '0' for no.\n";
		std::cin >> answerOneNoYes;

		if (answerOneNoYes == 1)                                       // determines if yes or no was said | 1 = yes, 0 = no
		{
			nextStep();												   // if yes, calls nextStep() and continues the process
		}
		else
		{
			std::cout << "Please exit the program and try again.\n";   // otherwise, user is given this message prompting to restart the program
		}

		return 0;
}

int nextStep()
{
	std::cout << "You've completed the first step.\n";
	return 0;
}

[mbozzi]

1. #include <string> is missing
2. the name nextStep is used before it's declared. Declare the function before its point of use, for example, by placing

int nextStep();

on line 3.

[mbahmimpi]

for newbie like me, just waiting for mastah answere heheh

[MysteryFlavour]

@mobozzi Ah, thank you! That makes sense.

[MysteryFlavour]

@mbahmimpi Hahaha