pdifff.c (1204B)
1 /** 2 * @license Apache-2.0 3 * 4 * Copyright (c) 2020 The Stdlib Authors. 5 * 6 * Licensed under the Apache License, Version 2.0 (the "License"); 7 * you may not use this file except in compliance with the License. 8 * You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 */ 18 19 #include "stdlib/math/base/special/pdifff.h" 20 #include "stdlib/math/base/assert/is_nanf.h" 21 22 /** 23 * Returns the positive difference between `x` and `y`. 24 * 25 * @param x first number 26 * @param y second number 27 * @return positive difference 28 * 29 * @example 30 * float v = pdiff( 6.0f, 3.0f ); 31 * // returns 3.0f 32 * 33 * @example 34 * float v = pdiff( 3.0f, 4.0f ); 35 * // returns 0.0f 36 */ 37 float stdlib_base_pdifff( const float x, const float y ) { 38 if ( stdlib_base_is_nanf( x ) || stdlib_base_is_nanf( y ) ) { 39 return 0.0f / 0.0f; // NaN 40 } 41 if ( x > y ) { 42 return x - y; 43 } 44 return 0.0f; 45 }