Hi,

I thought i'd have a play around in C++. I'm a complete newbie (in C++ not programming). I'm trying to make a simple calculator to get a grasp of the syntax. (i'm used to python and VB).

What trying to do is declare the functions with prototype functions up the top. Get from the user if they want to do addition,subtracton,div or multi and then do it. This is where my first problem comes in. I don't understand how to do.. elifs.. or elseifs.. if c++ even does it?. And also I don't know how to compare properly using the logical operator || .. It keeps giving me the error ANSI C++ forbids comparison between pointer and integer. I'll post the gcc output and my attempt to do the program.

Thanks very much for any help!

Code:
#include <iostream>
// Simple add, subtract, mult,divide calculator

int funcAdd(int,int);
int funcSub(int,int);
float funcDiv(int,int);
long funcMulti(int,int);

int main()
{
    char decide;
    int first;
    int second;
    int result;
    
    std::cout << "What would you like to do: (A)dd, (S)ubtract, (D)ivide or (M)ultiply ?\n";
    std::cin >> decide;
    
    if ( (decide == "A") || (decide == "a") || (decide == "S") || (decide = "s") || (decide == "D") || (decide == "d") || (decide == "M") || (decide == "m") )
    {
	if ((decide == "A") || (decide == "a"))
	    std::cout << "\nAddition\n";
	    std::cout << "\nEnter the first number:";
	    std::cin >> first;
	    std::cout << "\nEnter the second number:";
	    std::cin >> second;
	    result = funcAdd(first,second);
	    std::cout << "\nAnswer for " << first << " + " << second << " = " << result << std::endl;
	else
	if ( (decide == "S") || (decide = "s") )
	    std::cout << "\nSubtraction\n";
	    std::cout << "\nEnter the first number:";
	    std::cin >> first;
	    std::cout << "\nEnter the second number:";
	    std::cin >> second;
	    result = funcSub(first,second);
	    std::cout << "\nAnswer for " << first << " - " << second << " = " << result << std::endl;
	else
	if ( (decide == "D") || (decide == "d")	)
	    std::cout << "\nDivision\n";
	    std::cout << "\nEnter the first number:";
	    std::cin >> first;
	    std::cout << "\nEnter the second number:";
	    std::cin >> second;
	    result = funcDiv(first,second);
	    std::cout << "\nAnswer for " << first << " / " << second << " = " << result << std::endl;
	else
	if ( (decide == "M") || (decide == "m")	)
	    std::cout << "\nMultiplication\n";
	    std::cout << "\nEnter the first number:";
	    std::cin >> first;
	    std::cout << "\nEnter the second number:";
	    std::cin >> second;
	    result = funcMulti(first,second);
	    std::cout << "\nAnswer for " << first << " * " << second << " = " << result << std::endl;
    }
    else
	std::cout "\n You did not enter a valid option";
}

int funcAdd(int x,int y)
{
    return x + y;
}

int funcSub(int x, int y)
{
    return x - y;
}

float funcDiv(int x, int y)
{
    return x / y;
}

long funcMulti(int x, int y)
{
    return x * y;
}

Code:
andrew@me:~$ g++ calc.cpp -o calc 
calc.cpp: In function `int main()':
calc.cpp:19: ANSI C++ forbids comparison between pointer and integer
calc.cpp:19: ANSI C++ forbids comparison between pointer and integer
calc.cpp:19: ANSI C++ forbids comparison between pointer and integer
calc.cpp:19: assignment to `char' from `const char *' lacks a cast
calc.cpp:19: ANSI C++ forbids comparison between pointer and integer
calc.cpp:19: ANSI C++ forbids comparison between pointer and integer
calc.cpp:19: ANSI C++ forbids comparison between pointer and integer
calc.cpp:19: ANSI C++ forbids comparison between pointer and integer
calc.cpp:21: ANSI C++ forbids comparison between pointer and integer
calc.cpp:21: ANSI C++ forbids comparison between pointer and integer
calc.cpp:29: parse error before `else'
calc.cpp:38: parse error before `else'
calc.cpp:45: warning: assignment to `int' from `float'
calc.cpp:47: parse error before `else'
calc.cpp:58: parse error before string constant
calc.cpp:59: confused by earlier errors, bailing out