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path: root/src/pal/tests/palsuite/c_runtime/_finite/test1/test1.c
blob: c815055b38b6ef11495ecd927cb5bef3b1182008 (plain)
 ```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 ``` ``````// Licensed to the .NET Foundation under one or more agreements. // The .NET Foundation licenses this file to you under the MIT license. // See the LICENSE file in the project root for more information. /*============================================================================ ** ** Source: test1.c ** ** Purpose: Checks that _finite correctly classifies all types ** of floating point numbers (NaN, -Infinity, Infinity, ** finite nonzero, unnormalized, 0, and -0) ** **==========================================================================*/ #include /* The IEEE double precision floating point standard looks like this: S EEEEEEEEEEE FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF 0 1 11 12 63 S is the sign bit. The E bits are the exponent, and the 52 F bits are the fraction. These represent a value, V. If E=2047 and F is nonzero, then V=NaN ("Not a number") If E=2047 and F is zero and S is 1, then V=-Infinity If E=2047 and F is zero and S is 0, then V=Infinity If 0