same compiler, diff comps, 1 can't compile

i made a simple script to find total resistance through a parallel circuit on a friend's computer. i compiled it using Dev C++ 4 and it worked perfectly. i sent the code to my own computer and using the same compiler, Dev C++ 4, it absolutely refused to compile on my computer. look at this code



here are the errors

10 c:\dev-c_~1\parall~1.cpp
parse error before character 0240
18 c:\dev-c_~1\parall~1.cpp
ANSI C++ forbids declaration `resistance' with no type
18 c:\dev-c_~1\parall~1.cpp
`reciprical_sum' was not declared in this scope
19 c:\dev-c_~1\parall~1.cpp
syntax error before `<'
20 c:\dev-c_~1\parall~1.cpp
ANSI C++ forbids declaration `system' with no type
20 c:\dev-c_~1\parall~1.cpp
`int system' redeclared as different kind of symbol
283 c:\dev-c_~1\include\stdlib.h
previous declaration of `int system(const char *)'
20 c:\dev-c_~1\parall~1.cpp
initialization to `int' from `const char *' lacks a cast
21 c:\dev-c_~1\parall~1.cpp
parse error before `return'

notice the line in bold. Dev C++ tried to tell me that even one of the include files is wrong.




ok windows is a POS because every time i try to paste stuff from my source file, it keeps putting underscores into my post!!!!
just disregard all underscores in that posted code except for one of the float names.

"i made a simple script to find total resistance through a parallel circuit on a friend's computer."

Maybe any programs dealing with parallel resistance won't compile on more than one computer using Dev C++ 4?

Have you ever successfully compiled a program on your computer using Dev C++ 4?

"ok windows is a POS because every time i try to paste stuff from my source file, it keeps putting underscores into my post!!!!"

I've never had that problem.

um did you even read my post? it clearly states that it can compile on my friend's computer but not mine.

both computers run WinXP if that matters.

The two IDEs are probably configured differently. To solve the mystery, you should compare your compiler options with your friend's. It's possible that yours is set to a stricter level than his. Sorry, I rarely use the Dev-C++ IDE, so I cannot suggest which menu to find the compiler options under.

If yours is set to be stricter, then I might have spotted what it's choking on:



In the while, you are comparing a float variable to an integer constant. Your friend's compiler probably automatically converts the integer zero to a float, while yours won't. Also, you are assigned an integer to the float reciprical_sum, though an assignment is usually more accommodating with regard to automatic type conversion than a comparison operation is.

I would have written:


Please let us know if that fixes it.

Please note that a double is the default floating-point data type. Therefore, a floating-point constant that is not a double must have a qualifying suffix: f or F for float and L or l for long double.

For that matter, do you have a compelling reason to use a float instead of a double?

my book (Practical C++ Programming) says that float is completely different from double.



it's float for 2 reasons.
-the most accurate a resistor can be is +-5%. having the ability to do like 15 significant digits instead of 6 really doesn't make it more accurate.
-double takes twice as much memory.

obviously memory is not a problem with a little dinky 20 line script but it's best to be a responsible programmer whenever possible and not a Microsoft style programmer


btw, it works now. thanks