Thread: Please help me figure this out for class, important.

This is my assignment and it is due tomorrow. I am only doing it now because my other classes have me swamped. This is supposed to be my fall break. Anyways, I really do not understand this assignment, but what code i do have so far is included at the bottom. As far as I can tell she wants 5 functions... can someone please explain this stuff to me, I do not want it written for me, but please explain this to me like I am a beginner because I am.

CSCI 1010 Programming Assignment 5

A. Purpose- Write a program that uses functions, switch statement, type char data and a for loop.
B. Due Date- Due by 8 p.m. on Wednesday 10/18/06

C. Program Description – Name the program a5yourlastname.cpp
Write a C++ Program that uses functions to solve simple mathematics problems. The main function should prompt for and input how many integer sets of data to process. The main function should use a loop that will prompt the user to input a single character (an uppercase A, S, M or D) followed by two real numbers. Use the switch statement (see pages 270- 274) to determine which character was entered and call one of the following 4 functions that the program must declare and define:
 Add if A was entered to add the two type double numbers and return their sum
 Subtract if S was entered to subtract the second number from the first and return the difference
 Multiply if M was entered to multiply the two numbers and return their product
 Divide if D was entered to divide the second number into the first and return the quotient. If the second number is 0 do not call the function but display a message that division by zero is not allowed.

After the appropriate function is called and the answer is returned to the main function call a void function that is passed the 2 numbers, the symbol for the math operator and the answer. The function will display the answer as an equation:
num1 symbol num2 = answer
where num1 and num2 are displayed with one decimal place and the symbol is +, -, * or /.

If the single character entered is not an A, S. M or D then do not prompt for the two numbers but display an appropriate error message.

The program must be written to declare, define and call the four functions described above. It must also use the switch statement and process integer sets of data. A sample run of the program is below where the bolded numbers are the inputs typed as the program is running.

How many problems to solve? 7
Enter an A, S, M, or D: M
Enter two real numbers to multiply: 2.2 3.1
2.2 * 3.1 = 6.8

Enter an A, S, M, or D: S
Enter two real numbers to subtract: 5.6 3.1
5.6 - 3.1 = 2.5

Enter an A, S, M, or D: D
Enter two real numbers to divide: 2.2 0
Division by zero is not allowed

Enter an A, S, M, or D: A
Enter two real numbers to add: 6.51 2.11
6.5 + 2.1 = 8.6

Enter an A, S, M, or D: D
Enter two real numbers to divide: 2.2 2.0
2.2 / 1.0 = 1.1

Enter an A, S, M, or D: P
Must enter an A, S, M or D

Enter an A, S, M, or D: A
Enter two real numbers to add: 1.2 1.1
1.2 + 1.1 = 2.3

Code:

#include<iostram>
#include<iomanip>

double add (double num1, double num2);
//add num1 to num2

int main()
{
        double total;
        char letter;
        cout << "Enter a letter (A,S,M,D):" << endl;
        cin >> letter;
        cout << "Enter two numbers:" << endl;

Thank you for your help, but what is this std::
she has not covered that yet.

Has she covered 'using namespace std;'? You can put std:: on front of some common things or you can use namespaces.

Code:

using namespace std;

[...]

cout<< "WOW!";

or

Code:

std::cout<< "WOW!";

While namespaces are nice, std:: is better for large projects. Plus, it grows on you ... eventually. It did on me anyways.

she covered putting "using namespace std;" in the code, btu thats it, she hasnt covered putting "std" anywhere else.

Throw the "using namespace std;" at the top then, and get rid of all the "std::"'s, and do as prelude says

Originally Posted by Salem

Have you read your book or course notes for an example of a switch statement?

switch ( letter ) case 'A': doAdd(); break;
Kinda thing.

I have, she did not give us a simple function program to write before this one. Of course this may be simple to you.

So do I just write:

Code:

switch(letter)
     {
      case 'A' : total = add (n1, n2);

in that case, i dont see how it calls the function.

err.. im lost

so i addedin what looked like correct switch statements.

i still have to put in

displayit (n1, n2, total, '+') in the int main

and the

void displayit (double num1, double num2, double ans, char symbol)

I think the last 2 in the void are incorrect, I was writing notes instead of actual code.

Originally Posted by Prelude

>Throw the "using namespace std;" at the top then, and get rid of all the "std::"'s, and do as prelude says
How about do as Prelude says and not throw a using directive at the top? That feature was only meant as a crutch for moving older code to standard implementations, not as a convenience for new code.

Any yoyo who recommends it is flirting with danger...because I'll slap them silly.

id rather stay away from code that the prof hasnt covered, thank you tho