Programming Forums > Application Development > C++

Chronos · Nov 17th, 2007, 8:14 AM

I have a program to write as part of assignment for class, using C++ of course and using functions. Basically I have to write a Resistor Colour Code Calculator which will allow a user to input the colours and it would give them a value as well as a tolerance range. I am currently having trouble writing the part for the first two bands which are the significant figures. Form what I can see I need to call the Significant Figures function twice, and I have no idea how to do it.

int sigfig () //Significant Figures Function

{

 string sband1,sband2,sband3,sband4;

 int nband,nband2,nband3,nband4, count;



  cout << "Please enter colour of band 1";

  cin >> sband1;

 //while (count !=1)

//{

 //count = count +1;

 if (sband1 == "black")

 {

 nband=0;

 }

int main()  // Main Function

{

  string band1, band2, band3, band4, result, colour, func, band;



  band1 = sigfig ();

  cout << band1;



  cout << "Please enter colour of band 2";

  cin >> band2;



  band2 = sigfig ();

  cout << band2;



  cout << "Please enter colour of band 2";

  cin >> band2;

  cout << "Please enter colour of band 3";

  cin >> band3;

  cout << "Please enter colour of band 4";

  cin >> band4;

DaWei · Nov 17th, 2007, 8:46 AM

Your question isn't clear. Functions are designed to be called repeatedly. Otherwise, you might as well use inline code and booger up your footprint.

Please, henceforth, put your code in code tags. Because of the ugligness and unformatted nature of the code, I won't even read it. Consequently, I cannot give you a meaningful comment, other than the above.

Chronos · Nov 17th, 2007, 9:49 AM

All I did was use the wrong code tags, didn't realise that there were more than one of them. I have solved the problem without the use of functions but the teacher wants it done with functions.

What i meant is that I want to call the function twice, for both band 1 and band 2. And having it being able to read the colour and give me the number for both those bands.

Note the following code is not the full code but just parts of it.

 C++ Syntax (Toggle Plain Text) 
int sigfig () //Significant Figures Function
{
string sband1,sband2,sband3,sband4;
int nband,nband2,nband3,nband4, count;
 
cout << "Please enter colour of band 1";
cin >> sband1;
 
if (sband1 == "black")
{
nband=0;
}
 
int main() // Main Function
{
string band1, band2, band3, band4, result, colour, func, band;
 
band1 = sigfig ();
cout << band1;
 
cout << "Please enter colour of band 2";
cin >> band2;
 
band2 = sigfig ();
cout << band2;
 
cout << "Please enter colour of band 2";
cin >> band2;
cout << "Please enter colour of band 3";
cin >> band3;
cout << "Please enter colour of band 4";
cin >> band4;
int sigfig () //Significant Figures Function
{
string sband1,sband2,sband3,sband4;
int nband,nband2,nband3,nband4, count;

cout << "Please enter colour of band 1";
cin >> sband1;

if (sband1 == "black")
{
nband=0;
}

int main() // Main Function
{
string band1, band2, band3, band4, result, colour, func, band;

band1 = sigfig ();
cout << band1;

cout << "Please enter colour of band 2";
cin >> band2;

band2 = sigfig ();
cout << band2;

cout << "Please enter colour of band 2";
cin >> band2;
cout << "Please enter colour of band 3";
cin >> band3;
cout << "Please enter colour of band 4";
cin >> band4;

Wizard1988 · Nov 17th, 2007, 10:25 AM

(Toggle Plain Text)

void myFunction()
{
  cout << "Hello there!\n";
}

int main()
{
 myFunction();
 myFunction();
 return 0;
}

myFunction() is called twice in this example.

Chronos · Nov 17th, 2007, 1:40 PM

Okay wizard, now after that call to that function is made twice I need to store two different variables, using that same function.

But thanks for your help, that seems like with will help me out a lot. I'll stop by if I have any more problems.

Wizard1988 · Nov 17th, 2007, 3:27 PM

Well in the example I gave you the function returns void which is nothing. You might want to return an integer, int.

(Toggle Plain Text)

int add(int a, int b)
{
   return (a+b);
}

This code would simply add a and b and return it.

I hope this helps a bit more

WaltP · Nov 18th, 2007, 1:23 AM

Quote:

Originally Posted by Chronos

Okay wizard, now after that call to that function is made twice I need to store two different variables, using that same function.

OK then

(Toggle Plain Text)

int myFunction()
{
  cout << "Hello there!\n";
  return x;
}

int main()
{
  int a, b;
  a = myFunction();
  b = myFunction();
 return 0;
}

Wizard1988 · Nov 18th, 2007, 3:22 AM

Quote:

Originally Posted by WaltP

OK then

(Toggle Plain Text)

int myFunction()
{
  cout << "Hello there!\n";
  return x;
}

int main()
{
  int a, b;
  a = myFunction();
  b = myFunction();
 return 0;
}

I am afraid that that will not work

the variable x does not exist inside your version of myFunction();

WaltP · Nov 18th, 2007, 10:25 PM

Sorry, next time I'll write the OP's code for them...

Dameon · Nov 18th, 2007, 10:30 PM

Quote:

Originally Posted by WaltP

Sorry, next time I'll write the OP's code for them...

No. You should, however, at least try to be correct.

Nov 17th, 2007, 8:14 AM	#1
Chronos Newbie Join Date: Nov 2007 Location: Barbados Posts: 4 Rep Power: 0	Call to a Function more than once I have a program to write as part of assignment for class, using C++ of course and using functions. Basically I have to write a Resistor Colour Code Calculator which will allow a user to input the colours and it would give them a value as well as a tolerance range. I am currently having trouble writing the part for the first two bands which are the significant figures. Form what I can see I need to call the Significant Figures function twice, and I have no idea how to do it. `int sigfig () //Significant Figures Function { string sband1,sband2,sband3,sband4; int nband,nband2,nband3,nband4, count; cout << "Please enter colour of band 1"; cin >> sband1; //while (count !=1) //{ //count = count +1; if (sband1 == "black") { nband=0; }` `int main() // Main Function { string band1, band2, band3, band4, result, colour, func, band; band1 = sigfig (); cout << band1; cout << "Please enter colour of band 2"; cin >> band2; band2 = sigfig (); cout << band2; cout << "Please enter colour of band 2"; cin >> band2; cout << "Please enter colour of band 3"; cin >> band3; cout << "Please enter colour of band 4"; cin >> band4;`

Nov 17th, 2007, 8:46 AM	#2
DaWei Resident Grouch Join Date: Jun 2005 Posts: 6,453 Rep Power: 10	Re: Call to a Function more than once Your question isn't clear. Functions are designed to be called repeatedly. Otherwise, you might as well use inline code and booger up your footprint. Please, henceforth, put your code in code tags. Because of the ugligness and unformatted nature of the code, I won't even read it. Consequently, I cannot give you a meaningful comment, other than the above. __________________ Abstraction doesn't make it impossible to write bad code; it makes it possible to write superior code. Contributor's Corner: Grumpy on C++ Exceptions DaWei on Pointers

Nov 17th, 2007, 9:49 AM	#3
Chronos Newbie Join Date: Nov 2007 Location: Barbados Posts: 4 Rep Power: 0	Re: Call to a Function more than once All I did was use the wrong code tags, didn't realise that there were more than one of them. I have solved the problem without the use of functions but the teacher wants it done with functions. What i meant is that I want to call the function twice, for both band 1 and band 2. And having it being able to read the colour and give me the number for both those bands. Note the following code is not the full code but just parts of it. C++ Syntax (Toggle Plain Text) int sigfig () //Significant Figures Function { string sband1,sband2,sband3,sband4; int nband,nband2,nband3,nband4, count; cout << "Please enter colour of band 1"; cin >> sband1; if (sband1 == "black") { nband=0; } int main() // Main Function { string band1, band2, band3, band4, result, colour, func, band; band1 = sigfig (); cout << band1; cout << "Please enter colour of band 2"; cin >> band2; band2 = sigfig (); cout << band2; cout << "Please enter colour of band 2"; cin >> band2; cout << "Please enter colour of band 3"; cin >> band3; cout << "Please enter colour of band 4"; cin >> band4; int sigfig () //Significant Figures Function { string sband1,sband2,sband3,sband4; int nband,nband2,nband3,nband4, count; cout << "Please enter colour of band 1"; cin >> sband1; if (sband1 == "black") { nband=0; } int main() // Main Function { string band1, band2, band3, band4, result, colour, func, band; band1 = sigfig (); cout << band1; cout << "Please enter colour of band 2"; cin >> band2; band2 = sigfig (); cout << band2; cout << "Please enter colour of band 2"; cin >> band2; cout << "Please enter colour of band 3"; cin >> band3; cout << "Please enter colour of band 4"; cin >> band4;

Nov 17th, 2007, 10:25 AM	#4
Wizard1988 Professional Programmer Join Date: Oct 2005 Location: Chitown Posts: 417 Rep Power: 3	Re: Call to a Function more than once (Toggle Plain Text) void myFunction() { cout << "Hello there!\n"; } int main() { myFunction(); myFunction(); return 0; } void myFunction() { cout << "Hello there!\n"; } int main() { myFunction(); myFunction(); return 0; } myFunction() is called twice in this example. __________________ JG-Webdesign

Nov 17th, 2007, 1:40 PM	#5
Chronos Newbie Join Date: Nov 2007 Location: Barbados Posts: 4 Rep Power: 0	Re: Call to a Function more than once Okay wizard, now after that call to that function is made twice I need to store two different variables, using that same function. But thanks for your help, that seems like with will help me out a lot. I'll stop by if I have any more problems.

Nov 17th, 2007, 3:27 PM	#6
Wizard1988 Professional Programmer Join Date: Oct 2005 Location: Chitown Posts: 417 Rep Power: 3	Re: Call to a Function more than once Well in the example I gave you the function returns void which is nothing. You might want to return an integer, int. (Toggle Plain Text) int add(int a, int b) { return (a+b); } int add(int a, int b) { return (a+b); } This code would simply add a and b and return it. I hope this helps a bit more __________________ JG-Webdesign

Nov 18th, 2007, 10:25 PM	#9
WaltP Programmer Join Date: Oct 2007 Posts: 39 Rep Power: 0	Re: Call to a Function more than once Sorry, next time I'll write the OP's code for them...

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Programming Forums > Application Development > C++

Call to a Function more than once