Hi,

I am trying to make my program alter the number of times it requests info by using command line arguments. However I can't assign a variable to the value of the argument in the array i.e. int var = argv[2];

Code:
#include<iostream>
#include<string>
#include<cmath>
#include <iomanip>

using namespace std;

void transferTime ( int hddSpeeds[], float sizeOfDir, float transferRate[] );

int main(int argc, char *argv[])
{
	char control = argv[2];
	string hddNames[control];
	float transferRate[control];
	int hddSpeeds[control];
	float sizeOfDir;
	float counter = 0;
	int fastest;
	for ( int loop = 0; loop < control; loop++ )
	{//open loop
		cout<<"Please enter a harddrive name to be compared: ";
		cin>> hddNames[loop];
		cout<<"Please enter the transfer speed of that drive in megabits per second: ";
		cin>> hddSpeeds[loop];
	}//end loop
	cout<<"Please enter the size of the directory being transferred in Gigabytes: ";
	cin>> sizeOfDir;
	transferTime( hddSpeeds, sizeOfDir, transferRate, control );
	for ( int loop = 0; loop < control; loop++ )
	{//open loop
		if ( counter < transferRate[loop] )
		{//open if
			 fastest = loop;
		}//close if
	}//close loop
	float topspeed;
	topspeed = transferRate[fastest];
	cout<<"Hard Drive\tTransfer rate (Mbps)\tDirectory Size(GB)\tTransfer time(s)\n";
	for (int loop = 0; loop < control; loop++ )
	{//open loop
		cout<< hddNames[loop] << "\t\t";
		cout<< hddSpeeds[loop] << "\t\t\t";
		cout<< sizeOfDir << "\t\t\t";
		cout<< std::fixed << setprecision(1) << topspeed << "\n";
	}//close loop
	cout<<"\n";
	cout<<"The fastest of the given Hard Drives was: \n";
	cout<<"Hard Drive\tTransfer rate (Mbps)\tDirectory Size(Gb)\tTransfer time(s)\n";
	cout<< hddNames[fastest] << "\t\t";
	cout<< hddSpeeds[fastest] << "\t\t\t"; 
	cout<< sizeOfDir << "\t\t\t"; 
	cout<< std::fixed << setprecision(1) << topspeed << "\n";
}

void transferTime ( int hddSpeeds[], float sizeOfDir, float transferRate[], int control )
{
	for (int loop = 0; loop < control; loop++ )
	{//open loop
		int dummy = hddSpeeds[loop];
		transferRate[loop] = sizeOfDir * 1024 * 8/dummy;
	}//close loop
	return;
}
Here are the errors I am getting:

Code:
hdd.cpp: In function ‘int main(int, char**)’:
hdd.cpp:12: error: invalid conversion from ‘char*’ to ‘char’
hdd.cpp:8: error: too many arguments to function ‘void transferTime(int*, float, float*)’
hdd.cpp:28: error: at this point in file
Thanks in advance.