help with functions
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Thread: help with functions

  1. #1
    Join Date
    Oct 2011
    Posts
    1

    Smile help with functions

    hey guys i need to make this code into seprate functions, i have no idea where to start. help !!

    Basically its a fourier graph program in which the user enters the number of interations and the program pumps out a graph .

    Code:
    #define _USE_MATH_DEFINES
    #include <iostream>
    #include <cmath>
    #include <iomanip>
    using namespace std;
    
    int main ()
    { 
    	int not;
    	double unrsum=0;
    	const int asize =61;
    	int rsum;
    	double xy=40/M_PI;
    	int arrayx[asize];
    	int max=0;
    	int min=0;
    
    	cout << "FOURIER SERIES GRAPH\n";
    	cout << "No. of terms = ";
    	cin>>not;
    	while (not<=0)
    
    	{
    		cout << "No. of terms must be greater than zero."<<endl;
    		cout << "Enter No. of terms: ";
    		cin>> not;
    	}
    
    
    	for(int theta=0;theta<=360;theta+=6)
    	{
    		for(int n=0;n<not;n++)
    		{
    			double thetarad;
    			thetarad=theta*((M_PI)/180);
    			unrsum+=((sin((2*n + 1)*((thetarad))))/(2*n + 1));;
    		}
    		if (unrsum > 0)
    		{
    			rsum = xy*unrsum + 0.5;
    		}
    		else
    		{
    			rsum = xy*unrsum - 0.5;
    		}
    		int r=theta/6;
    		arrayx[r]=rsum;
    		unrsum=0;
    	}
    
    	max = arrayx[0];
    	for (int i = 1; i < asize; i++)
    	{
    		if (arrayx[i] > max)
    		{
    			max = arrayx[i];
    		}
    	}
    	min =arrayx[0];
    	for (int i = 1; i < asize; i++)
    	{
    		if (arrayx[i] < min)
    		{
    			min = arrayx[i];
    		}
    	}
    	{ for(int i =max;i>=min;i--)
    
    	{
    		if (i==0)
    		{
    			cout <<setw(3)<<i << " ";
    
    			for (int x=0;x<=asize;x++){
    
    				if(i==arrayx[x])
    				{
    					cout << "*";
    				}
    
    				else
    				{
    					cout << "-";
    				}
    			}		
    		}
    		else
    		{	cout <<setw(3)<<i<<" ";
    
    		for (int x=0;x<=asize;x++){
    
    			if(i==arrayx[x])
    			{
    				cout << "*";
    			}
    
    			else
    			{	
    				cout << " ";
    			}
    		}
    
    		}
    		cout <<endl;
    	}
    
    	}
    }


    thanks so much !

  2. #2
    VictorN's Avatar
    VictorN is offline Super Moderator Power Poster
    Join Date
    Jan 2003
    Location
    Wallisellen (ZH), Switzerland
    Posts
    17,354

    Re: help with functions

    Just create a function and move this code to it. What is the problem?
    Victor Nijegorodov

  3. #3
    Join Date
    Sep 2004
    Location
    Holland (land of the dope)
    Posts
    4,123

    Re: help with functions

    You can split it up in as many functions you want. What is the reason for splitting it up ?

  4. #4
    Join Date
    Jan 2009
    Posts
    596

    Re: help with functions

    What you are trying to do is called 'refactoring'. In your case, the first thing to do is work through the code trying to work out which each bit does (maybe adding comments as you go). You should then be able to see which bits 'go together' most tightly. These bits can then be put in separate functions.

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