please help

[mcciysm3]

undefinedundefinedundefined
[tag]
i've been trying to write a program which allows the user to choose the math function for an equation but i don't know how to define it in the program or anything, i've got a simple version here but it doesn't work- could anyone give me any advice cheers
[\tag]
[code]
#include <iostream.h>
#include <math.h>
#include <iomanip>



double x, y, z, d;
char fx;
main()
{
cout<< "enter a func for x";
cin>>fx;
for (x=0; x<6; x++)
{
y=fx;
cout<<setw(6)<<x<<setw(6)<<y<<endl;
}
cin>> d;
return 0;
}
[\code]

[elad]

Welcome to the board.

Nice try with the code tags, but it's a / instead of a \ before the word code that does the magic.

Often this type of a program is set up with a menu and a switch:

//menu
int choice;
cout << "enter # of selection from choices below" << endl;
cout << "1) +" << endl;
cout << "2) -" << endl;
//etc
cin >> choice;

or

char choice;
cout << "enter the sign of the arithmetic function you wish to do" << endl;
cin >> choice;

Then use choice as the conditional of the switch:

switch(choice)
{
  case 1:
	 //do adding or call add function
	 break;
  case 2:
	 //do subtraction or call subtraction function
	 break;
  //etc
}
 
or 
switch(choice)
{
   case '+':
	 //do adding or call add function
	 break;
   case '-':
	 //do subtraction or call subtraction function
	 break;
   //etc
}

[Salem]

Or you could explore even more ways of messing up the code tags

[mcciysm3]

[tag]thanks, but i should have been more specific i'm looking for ways to input functions like sin(x) and x^2, [/tag]

[mcciysm3]

i give up on the tags too

[Hunter2]

Well, it's the same thing; have an option for 'sin' (option #4 or something), and in your switch block, do 'sin'. The functions you're looking for are, sin(x) etc. and pow(x,2), which are defined in <cmath>.

Just out of curiosity though, what are [tag] and [/tag] supposed to be? lol