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Visual Studio 2008
Visual Studio
Visual C++
Building a C/C++ Program
C/C++ Building Reference
C/C++ Build Errors
Compiler Warnings C4200 Through C4584
Compiler Warning (levels 2 and 4) C4200
Compiler Warning (level 4) C4201
Compiler Warning (level 4) C4202
Compiler Warning (level 4) C4203
Compiler Warning (level 4) C4204
Compiler Warning (level 4) C4205
Compiler Warning (level 4) C4206
Compiler Warning (level 4) C4207
Compiler Warning (level 4) C4208
Compiler Warning (level 4) C4210
Compiler Warning (level 4) C4211
Compiler Warning (level 4) C4212
Compiler Warning (level 4) C4213
Compiler Warning (level 4) C4214
Compiler Warning (level 1) C4215
Compiler Warning (level 1) C4216
Compiler Warning (level 1) C4218
Compiler Warning (level 4) C4220
Compiler Warning (level 4) C4221
Compiler Warning (levels 1 and 4) C4223
Compiler Warning (level 1) C4224
Compiler Warning (level 1) C4226
Compiler Warning (level 1) C4227
Compiler Warning (level 1) C4228
Compiler Warning (level 1) C4229
Compiler Warning (level 1) C4230
Compiler Warning (level 3) C4231
Compiler Warning (level 4) C4232
Compiler Warning (level 4) C4233
Compiler Warning (level 4) C4234
Compiler Warning (level 4) C4235
Compiler Warning (level 1) C4237
Compiler Warning (level 4) C4238
Compiler Warning (level 4) C4239
Compiler Warning (level 3) C4240
Compiler Warning (level 4) C4242
Compiler Warning (level 3) C4243
Compiler Warning (level 2) C4244
Compiler Warning (levels 3 and 4) C4244
Compiler Warning (level 4) C4245
Compiler Warning (level 2) C4250
Compiler Warning (level 1) C4251
Compiler Warning (level 4) C4254
Compiler Warning (level 4) C4255
Compiler Warning (level 4) C4256
Compiler Warning (level 1) C4258
Compiler Warning (level 4) C4263
Compiler Warning (level 1) C4264
Compiler Warning (level 3) C4265
Compiler Warning (level 4) C4266
Compiler Warning (level 3) C4267
Compiler Warning (level 4) C4268
Compiler Warning (level 1) C4269
Compiler Warning (level 1) C4272
Compiler Warning (level 1) C4273
Compiler Warning (level 1) C4274
Compiler Warning (level 2) C4275
Compiler Warning (level 1) C4276
Compiler Warning (level 3) C4278
Compiler Warning (level 3) C4280
Compiler Warning (level 3) C4281
Compiler Warning (level 3) C4282
Compiler Warning (level 3) C4283
Compiler Warning (level 2) C4285
Compiler Warning (level 1) C4286
Compiler Warning (level 3) C4287
Compiler Warning (level 1) C4288
Compiler Warning (level 4) C4289
Compiler Warning (level 3) C4290
Compiler Warning (level 1) C4291
Compiler Warning (level 1) C4293
Compiler Warning (level 4) C4295
Compiler Warning (level 4) C4296
Compiler Warning (level 1) C4297
Compiler Warning (level 2) C4302
Compiler Warning (level 1) C4303
Compiler Warning (level 1) C4305
Compiler Warning (level 3) C4306
Compiler Warning (level 2) C4307
Compiler Warning (level 2) C4308
Compiler Warning (level 2) C4309
Compiler Warning (level 3) C4310
Compiler Warning (level 1) C4311
Compiler Warning (level 1) C4312
Compiler Warning (level 1) C4313
Compiler Warning (level 1) C4318
Compiler Warning (level 1) C4319
Compiler Warning (level 4) C4324
Compiler Warning (level 1) C4325
Compiler Warning (level 1) C4326
Compiler Warning (level 4) C4328
Compiler Warning (level 1) C4329
Compiler Warning (level 1) C4333
Compiler Warning (level 3) C4334
Compiler Warning C4335
Compiler Warning (level 4) C4336
Compiler Warning (level 4) C4337
Compiler Warning (level 4) C4339
Compiler Warning (level 1) C4340
Compiler Warning (level 3) C4341
Compiler Warning (level 1) C4342
Compiler Warning (level 4) C4343
Compiler Warning (level 1) C4344
Compiler Warning (level 2) C4345
Compiler Warning (level 1) C4346
Compiler Warning (level 4) C4347
Compiler Warning (level 1) C4348
Compiler Warning (level 1) C4350
Compiler Warning (level 1) C4351
Compiler Warning (level 1) C4353
Compiler Warning (levels 1 and 4) C4355
Compiler Warning (level 2) C4356
Compiler Warning (level 3) C4357
Compiler Warning (level 1) C4358
Compiler Warning (level 3) C4359
Compiler Warning (level 1) C4364
Compiler Warning (level 4) C4365
Compiler Warning (level 4) C4366
Compiler Warning C4368
Compiler Warning (level 1) C4369
Compiler Warning (level 3) C4373
Compiler Warning (level 1) C4374
Compiler Warning (level 1) C4375
Compiler Warning (level 1) C4376
Compiler Warning (level 1) C4377
Compiler Warning (level 1) C4378
Compiler Warning (level 1) C4379
Compiler Warning (level 1) C4381
Compiler Warning (level 1) C4382
Compiler Warning (level 1) C4383
Compiler Warning (level 1) C4384
Compiler Warning (level 4) C4389
Compiler Warning (level 3) C4390
Compiler Warning (level 1) C4391
Compiler Warning (level 1) C4392
Compiler Warning (level 1) C4393
Compiler Warning C4394
Compiler Warning (level 1) C4395
Compiler Warning (level 2) C4396
Compiler Warning (level 1) C4397
Compiler Warning (level 3) C4398
Compiler Warning (level 1) C4399
Compiler Warning (level 4) C4400
Compiler Warning (level 1) C4401
Compiler Warning (level 1) C4402
Compiler Warning (level 1) C4403
Compiler Warning (level 3) C4404
Compiler Warning (level 1) C4405
Compiler Warning (level 1) C4406
Compiler Warning (level 1) C4407
Compiler Warning (level 4) C4408
Compiler Warning (level 1) C4409
Compiler Warning (level 1) C4410
Compiler Warning (level 1) C4411
Compiler Warning (level 2) C4412
Compiler Warning (level 3) C4414
Compiler Warning (level 1) C4420
Compiler Warning (level 4) C4428
Compiler Warning (level 4) C4429
Compiler Warning C4430
Compiler Warning (level 4) C4431
Compiler Warning (level 4) C4432
Compiler Warning (level 4) C4433
Compiler Warning (level 4) C4434
Compiler Warning C4439
Compiler Warning (level 1) C4440
Compiler Warning (level 1) C4441
Compiler Warning (level 1) C4445
Compiler Warning (level 4) C4460
Compiler Warning (level 1) C4461
Compiler Warning (level 1) C4470
Compiler Warning (level 4) C4480
Compiler Warning (level 4) C4481
Compiler Warning (level 1) C4482
Compiler Warning C4484
Compiler Warning C4485
Compiler Warning (level 1) C4486
Compiler Warning (level 4) C4487
Compiler Warning (level 1) C4488
Compiler Warning (level 1) C4489
Compiler Warning (level 1) C4490
Compiler Warning (level 1) C4502
Compiler Warning (level 1) C4503
Compiler Warning (level 4) C4505
Compiler Warning (level 1) C4506
Compiler Warning (level 1) C4508
Compiler Warning (level 3) C4509
Compiler Warning (level 4) C4510
Compiler Warning (level 3) C4511
Compiler Warning (level 4) C4512
Compiler Warning (level 4) C4513
Compiler Warning (level 4) C4514
Compiler Warning (level 4) C4515
Compiler Warning (level 4) C4516
Compiler Warning (level 4) C4517
Compiler Warning (level 1) C4518
Compiler Warning (level 1) C4519
Compiler Warning (level 3) C4520
Compiler Warning (level 3) C4521
Compiler Warning (level 3) C4522
Compiler Warning (level 3) C4523
Compiler Warning (level 1) C4526
Compiler Warning (level 1) C4530
Compiler Warning (level 1) C4532
Compiler Warning (level 1) C4533
Compiler Warning (level 3) C4534
Compiler Warning (level 3) C4535
Compiler Warning (level 4) C4536
Compiler Warning (level 1) C4537
Compiler Warning (level 3) C4538
Compiler Warning (level 1) C4539
Compiler Warning (level 1) C4540
Compiler Warning (level 1) C4541
Compiler Warning (level 3) C4543
Compiler Warning (level 1) C4544
Compiler Warning (level 1) C4545
Compiler Warning (level 1) C4546
Compiler Warning (level 1) C4547
Compiler Warning (level 1) C4548
Compiler Warning (level 1) C4549
Compiler Warning (level 1) C4550
Compiler Warning (level 1) C4551
Compiler Warning (level 1) C4552
Compiler Warning (level 1) C4553
Compiler Warning (level 3) C4554
Compiler Warning (level 1) C4555
Compiler Warning (level 1) C4556
Compiler Warning (level 3) C4557
Compiler Warning (level 1) C4558
Compiler Warning (level 4) C4559
Compiler Warning (level 1) C4561
Compiler Warning (level 4) C4564
Compiler Warning (level 4) C4565
Compiler Warning (level 1) C4566
Compiler Warning (level 3) C4570
Compiler Warning (level 4) C4571
Compiler Warning (level 1) C4572
Compiler Warning (level 3) C4580
Compiler Warning (level 1) C4581
Compiler Warning (level 1) C4584
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Compiler Warning (level 3) C4287

Visual Studio 2008
'operator' : unsigned/negative constant mismatch

An unsigned variable was used in an operation with a negative number.

This warning is off by default. See Compiler Warnings That Are Off by Default for more information.

The following sample generates C4287:

Copy 
// C4287.cpp
// compile with: /W3
#pragma warning(default : 4287)
#include <stdio.h>

int main()
{
    unsigned int u = 1;
    if (u < -1)   // C4287
        printf_s("u LT -1");
    else
        printf_s("u !LT -1");
    return 0;
}
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