How can I create a function that reads a positive number and returns it, for loops is a must C++

Question

Hey I'm struggling on how to create a function that reads a list full of negative and positive values and it specifically selects the positive values only and returns it how would I make a function off of that

Answer 1

return how a list?

anyway:

if(number > 0) {
// return the number or fill a list
}

Answer 2

You can use std::vector to make it easier. Then you can use simple if statement to check if value is positive and save it to the vector, you can also return whole vector instead of playing with pointers.

So it could be something like this:
std::vector<int> positive;
int x;
while(file >> x) {
if (x>0) positive.push_back(x);
}

Answer 3

I may explaines it wrong but lets say the values are 1 -5 3 7 -6 3 its going to return only the positive integers

Answer 4

So the values i listed above is the input file and what I want is that function to read and see which one is positive
int ReadANumber(std::ifstream &);

This function keeps reading an integer until a non-negative integer is read.  The non-negative integer is returned.

Answer 5

Michał Doruch i want it as a function inside of this int ReadANumber(ifstream&)

Answer 6

Lets say I have a file that includes the following
5
6
7
-5
6
-7 we will call this .txt file where i will call it IFile >> Num i need to make a function that. Only returns a non neg integer

Answer 7

I'll wait

Answer 8

Michał Doruch

Answer 9

I am not going to help you until you show your attempt

Answer 10

https://code.sololearn.com/ctYxNwhoJkgd/?ref=app

Michał Doruch

Answer 11

This may look like it works lol

Answer 12

Nees to test it in visual studio

Answer 13

You have to name that ifstream reference, when passing it as argument inside function, so it should be:
int ReadANumber (ifstream& IFile)

Anyway, it will return first positive number only. If you want to return list of numbers, you can for example return pointer:

int *ReadANumber (ifstream& IFile)

If you want to make it easy, return some other container like vector, as memtioned a few days ago

Answer 14

Ok i just want it to return a positive integer thz