Tilted Forum Project Discussion Community  

Go Back   Tilted Forum Project Discussion Community > Interests > Tilted Technology


 
 
LinkBack Thread Tools
Old 09-19-2007, 09:41 PM   #1 (permalink)
Junkie
 
zero2's Avatar
 
[C++] Problem with for-loop

I have a problem for my class, and I've run into a really weird problem.

So the problem is a travel expense problem, where I need to use a for-loop to ask the user a few questions, such as cost of hotel, cost of parking fee, cost of bridge toll.

So anyhow here's a snippet of my code:

Code:
#include <iostream>
using namespace std;

int main()
{
double dhotel, dmeal, dpark, dbridge, dmiles, dtemp = 0.0; 
	string scar; // Car name
	int iyear; // Car year
	string scolor; // Car color
	string smake; // Car make
	int i = 0;
	int iSize = 0;
	int iCounter = 0;

/* = = = = = = = = = = = = = = = = = = = = = = = = = = = =	*/	
	cout << "Enter number of hotels you visited: ";
	cin >> iSize;

	for ( i = 0; i < iSize; i++ )
	{
		iCounter++;
		cout << "\nEnter total cost of hotel "
				 << iCounter
				 << ": $ ";
		cin >> dtemp;
		dhotel += dtemp;
	}
/* = = = = = = = = = = = = = = = = = = = = = = = = = = = =	*/
cout << "\nTotal cost of hotel: $ "
			<< dhotel;

	return 0;
}
Output
--------
Enter number of hotels you visited: 2

Enter total cost of hotel 1: $ 1.00

Enter total cost of hotel 2: $ 1.00

Total cost of hotel: $ 0.00162506 What's going on here?
zero2 is offline  
Old 09-21-2007, 02:51 AM   #2 (permalink)
Psycho
 
connyosis's Avatar
 
Location: Sweden - Land of the sodomite damned
Everything looks fine to me, and when compiling and running the program on my Linux box I get the expected answer.
Something funky must be going on on your side...
__________________
If atheism is a religion, then not collecting stamps is a hobby.
connyosis is offline  
Old 09-21-2007, 04:51 AM   #3 (permalink)
Muffled
 
Kadath's Avatar
 
Location: Camazotz
I assume this isn't all the code; is it possible you reuse the variables elsewhere in the code and the numbers are getting overwritten?
__________________
it's quiet in here
Kadath is offline  
Old 09-21-2007, 05:21 AM   #4 (permalink)
Lover - Protector - Teacher
 
Jinn's Avatar
 
Location: Seattle, WA
What compiler are you using?

My only guess is you're using one that (oddly) doesn't support multiple variable initialization on the same line. If dHotel isn't getting initialized to 0, then you could see this problem.

Try putting double dHotel = 0.0; on its own line.

Additionally, is there a reason for using doubles, rather than floats? Save yourself a little bit of memory.
__________________
"I'm typing on a computer of science, which is being sent by science wires to a little science server where you can access it. I'm not typing on a computer of philosophy or religion or whatever other thing you think can be used to understand the universe because they're a poor substitute in the role of understanding the universe which exists independent from ourselves." - Willravel
Jinn is offline  
Old 09-21-2007, 04:15 PM   #5 (permalink)
Junkie
 
zero2's Avatar
 
It now works after Jinnkai's suggestion of each variable having it's own line. That's really weird because normally it works, maybe the compiler didn't like it this time, since I had so many variables on one line.
zero2 is offline  
Old 10-04-2007, 12:30 PM   #6 (permalink)
Tilted
 
Variable initialization

Quote:
Originally Posted by zero2
It now works after Jinnkai's suggestion of each variable having it's own line. That's really weird because normally it works, maybe the compiler didn't like it this time, since I had so many variables on one line.

A lot of compilers will sometimes (in debug mode) initialize variables to reasonable values.. what you did at the top:

double var1, var2, var3 = 0;

is initializing ONLY var3. Sometimes you can get lucky and var1 and var2 will be 0. the correct line would be:

double var1=0, var2 = 0, var3 = 0;
__________________
"You're only given a little spark of madness. You mustn't lose it."
- Robin Williams
ergdork is offline  
 

Tags
forloop, problem


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -8. The time now is 11:49 PM.

Tilted Forum Project

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
© 2002-2012 Tilted Forum Project

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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360