C -help

[nt259]

Anyone know how to do this problem :
The purpose of this project is to develop a C program which will automatically calculate the value of either resistance, current or voltage based on the other two given values in the formula

Voltage = Resistance * Current ( Ohm¡¯s Law )

That is, if you enter values for resistance and current, the program will automatically calculate the corresponding voltage based the formula above. Similarly, if you enter values of voltage and current, the program will automatically calculate the corresponding resistance value based on the Ohm¡¯s Law.

The program can run repeatedly to calculate many sets of inputs and corresponding results until you terminate the program by entering 0 at the prompt for input.

2 Inputs to the Program

The user is presented with a menu such as below to indicate the type (resistance, current or voltage) of data for the input.

*************************************************
* *
* Menu *
* *
* Type 1 to enter Resistance value *
* Type 2 to enter Current value *
* Type 3 to enter Voltage value *
* Type 0 to exit the program *
* *
*************************************************

If any number other than 0 to 3, inclusive, were entered, the system will continue to prompt for the inputs with the above menu. The data entered are of floating point type.

Upon entering the first value, say Resistance, the menu will appear again to prompt the user for the second value. Assuming that the user chooses to enter the voltage value this time, the program will then determine that the Current is to be calculated and it is then calculated accordingly.

What happens when both consecutive inputs are of the same type (may be of different values)? The program will assume the latter input as the valid value for computation of result.


3 Outputs of the Program

When any two variables of the Ohm¡¯s Law Equation is calculated, the third parameter can be calculated and the overall result is displayed in the manner (correct to 2 decimal points) below:

By Ohm¡¯s Law,

Resistance = xxx.xx Ohms
Current = xxx.xx Amperes
Voltage = xxxxxx.xx Volts

By hitting on any key, the input menu as given in the Inputs to the Program above will be displayed again. The user can then enter another pair of values (any two parameters of the Ohm¡¯s Law) for computation of the third parameter of the Ohm¡¯s Law.

[strangerstill]

What I recommend you do is get a big pad of A4, and draw a flowchart, hand-testing it once you have it finished.

Then write the thing.

Come back if you run into trouble.

[qball]

Yes, I do...

when I was young, we, did our own homework.

BUT, my dad had to walk to school, uphill boff ways!

You have the reqs, what is stopping you?
==========================
//this from memory, so check sintacks
int age;
printf("how old are you");
scanf("%d", &age);
printf("You are (%d) years old.", age);

[emcron]

I have to agree with these guys, this program is very simple. You have the equations, just put them in your program. What it sounds like is that you have no idea on how to get started. So go read the book and look at the examples, or look for the many example that you can find on the internet.

[vass0922]

Just to help ya get started.

You would want a case statement to enter the values
Maybe an if then else of.. as well

If voltage = empty (or 0 whatever)
then do this formula
if current = empty
then do this formula
else
do this formula


Not gonna show ya the code, the code is fairly simple if you know the language :P LOL