Can you tell me why my calculator program won't compile please..

byronflds (119)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
 
 //-| -------------------------------------------------------------------------------
//-| COP 3014C Fundamentals of Programming
//-|
//-| Assignment ID:   PROG9
//-|
//-| File name:   calculator.cpp
//-|
//-| Author:   bfields Byron Fields
//-|
//-| Due:   Mar 23 by 11pm
//-| ---------------------------------------------------------------------------------

#include <iostream>
#include <cmath>
using namespace std;

int main ()
{

//-| ------------------------
//-| Declare Variables
//-| ------------------------
float leftOp;
float rightOp;
float multipliCand;
float multiPlier;
float diviDend;
float diviSor;
float Num;
float Pow;
char menu;
float Sum;
float Sub;
float Multi;
float Divi;
float Rem;
float Expo;

//-| ------------------------------------------
//-| Menu interface
//-| =========================================
//-| ||            MY CALCULATOR            ||
//-| | ------------------------------------- |
//-| |   A) Add                              |
//-| |   S) Subtract                         |
//-| |   M) Multiply                         |
//-| |   D) Divide                           |
//-| |   R) Remainder (Mod)                  |
//-| |   P) Power (Exponentiate)             |
//-| |   Q) QUIT (turn off)                  |
//-| | ------------------------------------- |
//-| | (c) 2012, cop3014cjoe Dr. Jones       |
//-| =========================================
//-| --------------------------------------------

cout << "Enter Menu Choice:"
cin >> menu;

//-| ----------------------
//-| Switch Statement
//-| ----------------------
switch(menu)
{
   case 'A':
   cout << "A: Enter left operand: " << endl; 
   cin >> leftOp;
   cout << "A: Enter right operand: " << endl;
   cout << "A: Enter left operand: " << endl; 
   cin >> leftOp;
   cout << "A: Enter right operand: " << endl;
   cin >> rightOp;
   Sum = leftOp + rightOp;
   cout << leftOp << " + " << rightOp << " = " << Sum << endl;
   cout << "(c) 2012, bfields Byron Fields" << endl;
   break;
   case 'S':
   cout << "S: Enter left operand: " << endl;
   cin >> leftOp;
   cout << "S: Enter right operand: " << endl;
   cin >> rightOp;   
   Sub = leftOp - rightOp; 
   cout << Sub << " = " << leftOp << " - " << rightOp << endl;
   cout << "(c) 2012, bfields Byron Fields" << endl;
   break;   
   case 'M':
   cout << "M: Enter Multiplicand: " << endl;
   cin >> multipliCand;
 cout << "M: Enter Multiplier: " << endl;
   cin >> multiPlier;
   Multi = multipliCand * multiPlier;
   cout << multipliCand << " x " << multiPlier << " = " << Multi << endl;
   cout << "(c) 2012, bfields Byron Fields" << endl;
   break;   
   case 'D':
   cout << "D: Enter Dividend: " << endl;
   cin >> diviDend;
   cout << "D: Enter Divisor: " << endl;
   cin >> diviSor;
   Divi = diviDend / diviSor;
   cout << diviDend << " / " << diviSor << " = " << Divi << endl;
   cout << "(c) 2012, bfields Byron Fields" << endl;
   break;   
   case 'R':
   cout << "R: Enter left operand: " << endl;
   cin >> leftOp;
   cout << "R: Enter right operand: " << endl;
   cin >> rightOp;
   Rem = leftOp % rightOp;
   cout << leftOp << " % " << rightOp << " = " << Rem << endl;
   cout << "(c) 2012, bfields Byron Fields" << endl;
   break;   
   case 'P':
   cout << "P: Enter the Number: " << endl;
   cin >> Num;
   cout << "P: Enter the Power: " << endl;
   cin >> Pow;
   Expo = pow( Num, Pow);
   cout << "pow(" << Num << "," << Pow << ")" << " = " << Expo << endl;
   cout << "(c) 2012, bfields Byron Fields" << endl;
   break;   
   case 'Q':
 cout << "Q: POWERING DOWN ... " << endl;
   cout << "(c) 2012, bfields Byron Fields" << endl;
   break;
}
   return 0;
}
byronflds (119)
this is the error i keep getting:


calculator.cpp:105: invalid operands of types `float' and `float' to binary `
operator%'
Lowest0ne (1536)
Line 56: you don't end with a ;
Line 108: modulus requires both values be an integer.

Also, you need to put an ignore after every single time some one types a number in.
long double main (999)
A couple of things:

56
57
 
cout << "Enter Menu Choice:" // Forgot semicolon here
cin >> menu;

Secondly, you can't use the modulus operator with floats.
Use fmod:
http://www.cplusplus.com/reference/clibrary/cmath/fmod/

@LowestOne: the ignore thing isn't really necessary if you don't use getline or anything like that.
(though it does save you some time if you decide you want to put it in later)
byronflds (119)
okay thanks. i got it to compile. do you have any idea why my switch does not work though?
long double main (999)
You have to enter a capital letter...

Or, another way to do this would be
56
57
58
 
cout << "Enter Menu Choice:";
cin >> menu;
menu = toupper(menu); // #include <cctype> for this

to convert the input to uppercase (so you can enter either a lowercase or uppercase letter, and it'll work).

EDIT: By the way, what's the deal with this?
64
65
66
67
68
69
70
71
 
case 'A':
cout << "A: Enter left operand: " << endl; 
cin >> leftOp;
cout << "A: Enter right operand: " << endl;
cout << "A: Enter left operand: " << endl; 
cin >> leftOp;
cout << "A: Enter right operand: " << endl;
cin >> rightOp;
Last edited on
byronflds (119)
thanks man! you saved my grade. just barely got it submitted.
Topic archived. No new replies allowed.