Math problem: Total Noob

Targsmom · #1 19-Oct-2006, 20:47

Hello. I'm taking a C course right now and I'm stumped.. I can't figure out why my code isn't working.

Here is my homework assignment: (no I'm not looking for anyone to do this for me.. and please be kind. It's my first C course)

1) present a menu to the user from which there will be 6 choices
A -> Add two numbers
S -> Subtract two numbers
M -> Multiply two numbers
D -> Divide two numbers
O -> Modulus two numbers
E -> Exit
2) If the user enters a A, S, M, D or a O the program will prompt the user for two numbers and perform the needed math on them and output the number.
3) If the user enters an E then the program will thank the user for trying to use the program then exit nicely.
4) The program must use If ?else statements.
5) The program should use floating point numbers for all numbers entered. But you must cast them to an integer for the modulus.

I'm stumped on the casting, but I'll worry about that later. This is my code snippet:

CPP / C++ / C Code:

#include <stdio.h>

int main()
{
	char option;
	float num1;
	float num2;
	float result; /*Defining variables*/


            printf("For Addition, please enter A \n");
            printf("For Subtraction, please enter S \n");
            printf("For Mutiplication, please enter M \n");
            printf("For Division, please enter D \n");
            printf("To find the remainder, please enter O\n");
            printf(To exit the program, please enter E\n"); /*This will print a menu in a format that I hope is readable*/

	scanf("%c", &option);

	if (option == 'A')
	{
		printf("Please enter two numbers you wish to add.\n");
		scanf("%f %f", &num1, &num2);
		result = num1 + num2;
		printf("The total is %f, result");
	}


	else if (option == 'S')
	{
		printf("Please enter two numbers, with the second to be subtracted from the first.\n");
		scanf("%f %f, &num1, &num2");
		result = num1 - num2;
		printf("The differenc is %f, result");
	}


	
	return (0);
}

When I compile and run this every answer I get is:
The total is 0.000000, &result

Obviously I have something boneheaded in there.. and I've got 4 books and Google and no idea what I missed.

Can someone help me?

Thank you!

Jennifer

WaltP · #2 19-Oct-2006, 23:41

Jennifer, THANK YOU for reading the Guidelines before posting! You are a pearl in the .... better stop there

First thing you should always do when you run up against a problem like this is print the values entered to see if they are correct. You may find they aren't. scanf() is a notoriously ill-behaved function, and I think you might be getting caught in the dirty-input-stream problem. See this.

Also, since all your operations work on 2 numbers, you could read the numbers before your IFs and have only one place for reading. But if you plan on accepting 1 or 3 numbers at some point, this may not be a good thing to do.

[edit]I just noticed your printf() for the result is wrong. Look carefully.[/edit]

niek_e · #3 19-Oct-2006, 23:47

And now to solve your problem:

Code:

printf("The differenc is %f, result");

should be:

Code:

printf("The differenc is %f", result);

(I replaced the quote)

Just a tiny syntax error!

gr Niek

Targsmom · #4 20-Oct-2006, 05:05

Quote:

Jennifer, THANK YOU for reading the Guidelines before posting!

Waltp, Nothing annoys me more than people who don't. I also think I'm going to tape RTFM on my wall at my desk at work.. But thank you.

And thank you for the link. I'll read that later today.. Interesting idea to read all the numbers first. Hrrrmmmm.... I also appreciate the idea that we may need to change that later.. I shall contemplate. Thanks!

Quote:

Just a tiny syntax error!

Thanks niek_e! That would be the "boneheaded" piece I couldn't find! Quotes always goof me up. You should have seen me trying to teach myself html!

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Math problem: Total Noob

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