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Nov 23rd, 2007

Arrays

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Hi,

I need some help writing this program. The question states to write a program that specifies three one-dimensional arrays named current, resistance, and volts. Each array should be capable of holding 10 elements. Using a for loop, input values for the current and resistance arrays. The entries in the volts array should be the product of the corresponding values in the current and resistance arrays (thus, volts[i] = current[i] * resistance[i]). After all of the data has been entered, display the following output:
Current Resistance Volts:
Under each column heading display the appropriate value.

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fudawala

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Nov 23rd, 2007

Re: Arrays

>>I need some help writing this program
Which part are you confused about? We are not going to write the program for you. So you might as well do what you can, post your program, and ask specific questions. The instructions seem to be pretty clear to me.

Last edited by Ancient Dragon; Nov 23rd, 2007 at 10:55 pm.

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Nov 23rd, 2007

Re: Arrays

Hi,

This is my program.

c++ Syntax (Toggle Plain Text)
#include <iostream>
using namespace std;
 
int main()
{
	const int ARRAYSIZE = 10;
	int i, current[ARRAYSIZE];
 
	for (i = 0; i < ARRAYSIZE; i++) // Enter the current values
	{
		cout << "Enter a number: ";
		cin >> current[i];
	}
 
	const int SIZE = 10;
	int j, resistance[SIZE];
 
	for (j = 0; j < SIZE; j++) // Enter the resistance values
	{
		cout << "Enter a number: ";
		cin >> resistance[j];
	}
 
	const int MAXNUMS = 10;
	int k, volts[MAXNUMS], volts = 0;
 
	for (k = 0; k < MAXNUMS; k++) // Display and calculate the voltage
	{
		cout << "The voltage is " << volts[k] << endl;
		volts[k] = current[i] * resistance[j];
	}
 
	return 0;
}
#include <iostream>
using namespace std;

int main()
{
	const int ARRAYSIZE = 10;
	int i, current[ARRAYSIZE];

	for (i = 0; i < ARRAYSIZE; i++) // Enter the current values
	{
		cout << "Enter a number: ";
		cin >> current[i];
	}

	const int SIZE = 10;
	int j, resistance[SIZE];

	for (j = 0; j < SIZE; j++) // Enter the resistance values
	{
		cout << "Enter a number: ";
		cin >> resistance[j];
	}

	const int MAXNUMS = 10;
	int k, volts[MAXNUMS], volts = 0;

	for (k = 0; k < MAXNUMS; k++) // Display and calculate the voltage
	{
		cout << "The voltage is " << volts[k] << endl;
		volts[k] = current[i] * resistance[j];
	}

	return 0;
}

But the program didn't succeed here. The error message that I'm receiving is c:\documents and settings\fidaali\my documents\computer science 102\professor hadi - homework 2 - prg2\prg2.cpp(25) : error C2040: 'volts' : 'int' differs in levels of indirection from 'int [10]'. The error message points me in the line int k, volts[MAXNUMS], volts = 0;.

Last edited by Ancient Dragon; Nov 23rd, 2007 at 11:19 pm. Reason: add code tags

fudawala

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Nov 23rd, 2007

Re: Arrays

you are attempting to duplicate the symbol name of the array and a variable. Variable names can not be duplicated.

Ancient Dragon

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Nov 23rd, 2007

Re: Arrays

I don't understand your last post thread about duplicating the variable names.

fudawala

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Nov 23rd, 2007

Re: Arrays

volts[MAXNUMS] is the name of an array
volts = 0 is the name of a simple integer

They must have different names

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Nov 24th, 2007

Re: Arrays

I have edited the program that I have created. Can you please check if this is right so far. The only problem I'm having is that it is calculating the voltage but the value I'm getting every time is -858993460 whenever I input any value. The program is suppose to calculate the voltage by multiplying current times resistance.

This is my program:

c++ Syntax (Toggle Plain Text)
 #include <iostream>
using namespace std;
 
int main()
{
 
// This is for Current
 
	const int ARRAYSIZE = 10;
	int i, current[ARRAYSIZE], sum = 0;
 
	for (i = 0; i < ARRAYSIZE; i++) // Enter the current values
	{
		cout << "Enter a number: ";
		cin >> current[i];
	}
 
	cout << "\nThe sum of the currents";
 
	for (i = 0; i < ARRAYSIZE; i++) // Display the sum of the currents
	{
		cout << " " << current[i];
		sum = sum + current[i];
	}
 
	cout << " is " << sum << endl;
 
 
// This is for Resistance
 
	const int SIZE = 10;
	int j, resistance[SIZE], number = 0;
 
	for (j = 0; j < SIZE; j++) // Enter the resistance values
	{
		cout << "Enter a number: ";
		cin >> resistance[j];
	}
 
	cout << "\nThe number of total resistances";
 
	for (j = 0; j < SIZE; j++) // Display the number of total resistances
	{
		cout << " " << resistance[j];
		number = number + resistance[j];
	}
 
	cout << " is " << number << endl;
 
	const int MAXNUMS = 10;
	int k, volts[MAXNUMS], total = 0;
 
	for (k = 0; k < MAXNUMS; k++) // Display and calculate the voltage
	{
		cout << "The voltage is " << volts[k] << endl;
		volts[k] = current[i] * resistance[j];
	}
 
	cout << " is " << volts[k] << endl;
 
	return 0;
}
 #include <iostream>
using namespace std;

int main()
{

// This is for Current

	const int ARRAYSIZE = 10;
	int i, current[ARRAYSIZE], sum = 0;

	for (i = 0; i < ARRAYSIZE; i++) // Enter the current values
	{
		cout << "Enter a number: ";
		cin >> current[i];
	}

	cout << "\nThe sum of the currents";

	for (i = 0; i < ARRAYSIZE; i++) // Display the sum of the currents
	{
		cout << " " << current[i];
		sum = sum + current[i];
	}

	cout << " is " << sum << endl;


// This is for Resistance

	const int SIZE = 10;
	int j, resistance[SIZE], number = 0;

	for (j = 0; j < SIZE; j++) // Enter the resistance values
	{
		cout << "Enter a number: ";
		cin >> resistance[j];
	}

	cout << "\nThe number of total resistances";

	for (j = 0; j < SIZE; j++) // Display the number of total resistances
	{
		cout << " " << resistance[j];
		number = number + resistance[j];
	}

	cout << " is " << number << endl;

	const int MAXNUMS = 10;
	int k, volts[MAXNUMS], total = 0;

	for (k = 0; k < MAXNUMS; k++) // Display and calculate the voltage
	{
		cout << "The voltage is " << volts[k] << endl;
		volts[k] = current[i] * resistance[j];
	}

	cout << " is " << volts[k] << endl;

	return 0;
}

Last edited by Ancient Dragon; Nov 24th, 2007 at 12:53 am. Reason: add code tags

fudawala

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Nov 24th, 2007

Re: Arrays

C++ Syntax (Toggle Plain Text)
for (k = 0; k < MAXNUMS; k++) // Display and calculate the voltage
{
  cout << "The voltage is " << volts[k] << endl;
  volts[k] = current[i] * resistance[j];
}
for (k = 0; k < MAXNUMS; k++) // Display and calculate the voltage
{
  cout << "The voltage is " << volts[k] << endl;
  volts[k] = current[i] * resistance[j];
}

not 'Display and calculate the voltage'
but 'calculate first and then display the voltage'
swap the two lines in the for loop.

vijayan121

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Nov 24th, 2007

Re: Arrays

The output that I have gotten is still not correct. When I try putting in 2 for 10 integers for the current and resistance it should be give me a total of 40 for both. When I multiply them, to get the voltage it should be give me 400 volts not 687194768.

This is my program again:

c++ Syntax (Toggle Plain Text)
#include <iostream>
using namespace std;
 
int main()
{
 
// This is for Current
 
	const int ARRAYSIZE = 10;
	int i, current[ARRAYSIZE], sum = 0;
 
	for (i = 0; i < ARRAYSIZE; i++) // Enter the current values
	{
		cout << "Enter a number: ";
		cin >> current[i];
	}
 
	cout << "\nThe sum of the currents";
 
	for (i = 0; i < ARRAYSIZE; i++) // Display the sum of the currents
	{
		cout << " " << current[i];
		sum = sum + current[i];
	}
 
	cout << " is " << sum << endl;
 
 
// This is for Resistance
 
	const int SIZE = 10;
	int j, resistance[SIZE], number = 0;
 
	for (j = 0; j < SIZE; j++) // Enter the resistance values
	{
		cout << "Enter a number: ";
		cin >> resistance[j];
	}
 
	cout << "\nThe number of total resistances";
 
	for (j = 0; j < SIZE; j++) // Display the number of total resistances
	{
		cout << " " << resistance[j];
		number = number + resistance[j];
	}
 
	cout << " is " << number << endl;
 
	const int MAXNUMS = 10;
	int k, volts[MAXNUMS], total = 0;
 
	for (k = 0; k < MAXNUMS; k++) // Display and calculate the voltage
	{
		volts[k] = current[i] * resistance[j];
		cout << "The voltage is " << volts[k] << endl;
	}
 
	cout << " is " << volts[k] << endl;
 
	return 0;
}
#include <iostream>
using namespace std;

int main()
{

// This is for Current

	const int ARRAYSIZE = 10;
	int i, current[ARRAYSIZE], sum = 0;

	for (i = 0; i < ARRAYSIZE; i++) // Enter the current values
	{
		cout << "Enter a number: ";
		cin >> current[i];
	}

	cout << "\nThe sum of the currents";

	for (i = 0; i < ARRAYSIZE; i++) // Display the sum of the currents
	{
		cout << " " << current[i];
		sum = sum + current[i];
	}

	cout << " is " << sum << endl;


// This is for Resistance

	const int SIZE = 10;
	int j, resistance[SIZE], number = 0;

	for (j = 0; j < SIZE; j++) // Enter the resistance values
	{
		cout << "Enter a number: ";
		cin >> resistance[j];
	}

	cout << "\nThe number of total resistances";

	for (j = 0; j < SIZE; j++) // Display the number of total resistances
	{
		cout << " " << resistance[j];
		number = number + resistance[j];
	}

	cout << " is " << number << endl;

	const int MAXNUMS = 10;
	int k, volts[MAXNUMS], total = 0;

	for (k = 0; k < MAXNUMS; k++) // Display and calculate the voltage
	{
		volts[k] = current[i] * resistance[j];
		cout << "The voltage is " << volts[k] << endl;
	}

	cout << " is " << volts[k] << endl;

	return 0;
}

Last edited by Ancient Dragon; Nov 24th, 2007 at 12:55 am. Reason: This is the third time I've had to add code tags

fudawala

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Nov 24th, 2007

Re: Arrays

(Toggle Plain Text)

for (k = 0; k < MAXNUMS; k++) // calculate and display the voltage
{
volts[k] = current[k] * resistance[k];
cout << "The voltage is " << volts[k] << endl;
}

vijayan121

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