help

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Give me the whole source.
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The main function has no idea what "vector" is.

There is no such thing as a 'Vector' in C++. If you want to use the vector standard library, you have to #include<vector>, and vector<int>x.

If you want to let the main function know what the function is, you have to do this.

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void Vector();

int main()
{
    // code
    return 0;
}

void Vector()
{
    // definition
}
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What?
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A .cpp and header? Just put this in header file:

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// whatever.h

#include <iostream>
#include <cstdlib> 

void displayValue(int[], int);
void setValue(int[], int);


This in .cpp
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// Whatever.cpp

void setValue(int value[], int size)
{
	
	for (int count = 0; count < size; count++)
	{
	      cin >> value[count];
	}
}

void displayValue(int value[], int size)
{
	cout << "Vector a: "; 
	for (int count = 0; count < size; count++)
	{ 
			cout << value[count] << ' ';
	}
	cout << endl;
}


Your main will look like this:
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#include "Whatever.h"

using namespace std;

int main()
{
	int size; 
	int* value;
	

     cout << "Input vector a: " << endl;
	 cin >> size; 
              value = new int [size];

	
	setValue(value, size); 
	displayValue(value, size);

	delete[] value;

	return 0;
}


And that should get you passing grades.

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Updated, check now.
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What? Why does it NEED to be that?
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But why? I don't understand what you're saying. If it needs to be that then why isn't it that? You clearly already have the code you need.
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Pages: 12