[C++] How to return and call vectors from functions?

[Yohanna99]

Hi, beginner coder here. I have a somewhat solid understanding of both vectors and functions, and have used the two of them many times, but I'm have trouble coding functions that have vectors in their parameters and as their return values.

Another thing I'm having trouble with is calling the return value from a function when the parameter is a single vector. The c++ forum explains how to call the return when the parameters are variables and I get that but there's no example with vectors.

Thanks :)

 

[johng1]

Could you give some specific code that you've tried with exactly what you want it to do? There's really nothing special about a vector object that is returned from a function; the only thing possibly is whether it is a reference to the object, pointer to the object or an object itself.

 

[Yohanna99]

This is very rough code just to give you an idea. Ignore things that may make no sense I'll edit it again soon.

#include <iostream>
#include <string>
#include <vector>

using namespace std;

string get_string_input(vector<string> strings);

float averageFunc(vector<float> floating);int main()
{

	cout << "enter a word. When you're done, enter done." << endl;

	vector<string> strings;

	string input;

	while (input != "done")
	{
		cin >> input;

		if (input == "done")
			break;
		else
			strings.push_back(input);
	
	}	cout << "your sentence is: ";
	for (int i = 0; i < strings.size(); i++) {

	// how to output return val from get_string_input

	

	cout << "enter a num. When you're done, enter 10001." << endl;

	vector<float> floating;

	float num;	while (num != 10001)
	{
		cin >> num;

		if (num == 10001)
			break;
		else
			floating.push_back(num);

	}
	

	// how to output return val from averageFunc	system("pause");
	return 0;
}

/*
The first function will be get_string_inputs, which will return a vector of strings.
This function should continually loop, taking input from cin, and putting that into
the vector that will be returned. It should take one parameter, which is the string
to take in that will denote that input should stop being received. When this input 
is found, the function will return the vector.
*/

string get_string_input(vector<string> strings) {	string s;
	for (int i = 0; i < strings.size(); i++) {

		s = strings[i];
		cout << s << " ";
	}
	

	return s;
}

/*
The second function will be an average function. This function should
take a vector of floats as input, and return a single float value that
is the average of the vector passed in.
*/
float averageFunc(vector<float> floating) {

	float total = 0.0;

	for (int i = 0; i < floating.size(); i++)	{

		total += floating[i];
}
	

	float avrg = total / floating.size(); // average of vector

	return avrg;
}

 

[I like Serena]

This is very rough code just to give you an idea. Ignore things that may make no sense I'll edit it again soon.

Hi Yohanna99! Welcome to MHB! (Smile)

It appears you're looking for:

// how to output return val from get_string_input
cout << get_string_input(strings) << endl;
...
// how to output return val from averageFunc
cout << averageFunc(floating) << endl;

Oh, and [m]num[/m] should really be initialized:

float num = 0;