Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 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 | 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 5007x 5007x 5007x 5007x 5007x 5007x 5007x 5007x 5007x 5007x 1x 1x 1x 1x 1x | /** * @license Apache-2.0 * * Copyright (c) 2018 The Stdlib Authors. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ 'use strict'; // MODULES // var getWord = require( '@stdlib/number/float32/base/to-word' ); var BIAS = require( '@stdlib/constants/float32/exponent-bias' ); // VARIABLES // // Exponent mask: 0 11111111 00000000000000000000000 var EXP_MASK = 0x7f800000; // TODO: consider making an external constant // MAIN // /** * Returns an integer corresponding to the unbiased exponent of a single-precision floating-point number. * * @param {number} x - single-precision floating-point number * @returns {integer8} unbiased exponent * * @example * var toFloat32 = require( '@stdlib/number/float64/base/to-float32' ); * var exp = exponentf( toFloat32( 3.14e34 ) ); // => 2**114 ~ 2.08e34 * // returns 114 * * @example * var toFloat32 = require( '@stdlib/number/float64/base/to-float32' ); * var exp = exponentf( toFloat32( 3.14e-34 ) ); // => 2**-112 ~ 1.93e-34 * // returns -112 * * @example * var toFloat32 = require( '@stdlib/number/float64/base/to-float32' ); * var exp = exponentf( toFloat32( -3.14 ) ); * // returns 1 * * @example * var exp = exponentf( 0.0 ); * // returns -127 * * @example * var exp = exponentf( NaN ); * // returns 128 */ function exponentf( x ) { // Convert `x` to an unsigned 32-bit integer corresponding to the IEEE 754 binary representation: var w = getWord( x ); // Apply a mask to isolate only the exponent bits and then shift off all bits which are part of the fraction: w = ( w & EXP_MASK ) >>> 23; // Remove the bias and return: return w - BIAS; } // EXPORTS // module.exports = exponentf; |