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157 lines
3.3 KiB
C++
157 lines
3.3 KiB
C++
//
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// FILE: float16_test0.ino
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// AUTHOR: Rob Tillaart
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// VERSION: 0.1.0
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// PURPOSE: test float16
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// DATE: 2015-03-11
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// URL: https://github.com/RobTillaart/float16
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//
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/*
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SIGN EXP MANTISSA
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0 01111 0000000000 = 1
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0 01111 0000000001 = 1 + 2−10 = 1.0009765625 (next smallest float after 1)
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1 10000 0000000000 = −2
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0 11110 1111111111 = 65504 (max half precision)
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0 00001 0000000000 = 2−14 ≈ 6.10352 × 10−5 (minimum positive normal)
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0 00000 1111111111 = 2−14 - 2−24 ≈ 6.09756 × 10−5 (maximum subnormal)
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0 00000 0000000001 = 2−24 ≈ 5.96046 × 10−8 (minimum positive subnormal)
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0 00000 0000000000 = 0
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1 00000 0000000000 = −0
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0 11111 0000000000 = infinity
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1 11111 0000000000 = −infinity
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0 01101 0101010101 = 0.333251953125 ≈ 1/3
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*/
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#include "float16.h"
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void setup()
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{
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while(!Serial);
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Serial.begin(115200);
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Serial.println(__FILE__);
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Serial.print("FLOAT16_LIB_VERSION: ");
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Serial.println(FLOAT16_LIB_VERSION);
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Serial.println("\nStart ");
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Serial.println();
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test_constructors();
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test_numbers();
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test_binary();
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test_toDouble();
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Serial.println("\ndone...");
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}
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void loop()
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{
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}
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void test_constructors()
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{
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Serial.println("\ntest_constructors:");
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float16 a;
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Serial.println(a.toDouble(), 9);
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Serial.println(a.getBinary(), HEX);
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float16 b = 6;
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Serial.println(b.toDouble(), 9);
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Serial.println(b.getBinary(), HEX);
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float16 e(EULER);
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Serial.println(e.toDouble(), 9);
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Serial.println(e.getBinary(), HEX);
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float16 f(e);
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Serial.println(f.toDouble(), 9);
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Serial.println(f.getBinary(), HEX);
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f = 1.61803398875; // golden ratio
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Serial.println(f.toDouble(), 9);
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Serial.println(f.getBinary(), HEX);
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Serial.println();
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}
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void test_toDouble()
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{
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Serial.println("\ntest_toDouble:");
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float16 f(3.1415);
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Serial.println(f.toDouble(), 9); // 3.14
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f.setBinary(0x0000);
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Serial.println(f.toDouble(), 9); // 0
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f.setBinary(0xFC00);
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Serial.println(f.toDouble(), 9); //-inf
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f.setBinary(0x7C00);
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Serial.println(f.toDouble(), 9); // inf
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f.setBinary(0x3C00);
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Serial.println(f.toDouble(), 9); // 1
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f.setBinary(0x3C01);
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Serial.println(f.toDouble(), 9); // 1.0009765625
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f.setBinary(0x3555);
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Serial.println(f.toDouble(), 9); // 0.333333
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Serial.println();
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}
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void test_binary()
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{
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Serial.println("\ntest_binary:");
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float16 e(3.1415);
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float16 f(0);
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Serial.println(e.toDouble(), 9);
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f.setBinary(e.getBinary());
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Serial.println(f.toDouble(), 9);
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Serial.println();
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}
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void test_numbers()
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{
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Serial.println("\ntest_numbers:");
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Serial.println("** ZERO **");
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float16 a(0);
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Serial.println(a.toDouble(), 9);
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Serial.println("** SUBNORMAL **");
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float16 b(1 / 1000.0);
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Serial.println(b.toDouble(), 9);
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Serial.println("** NORMAL **");
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float16 c(1 / 2000.0);
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Serial.println(c.toDouble(), 9);
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c = 1/3.0;
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Serial.println(c.toDouble(), 9);
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float16 d(1);
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Serial.println(d.toDouble(), 9);
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float16 e(PI);
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Serial.println(e.toDouble(), 9);
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Serial.println("** OVERFLOW **");
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float16 f(1000000.0);
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Serial.println(f.toDouble(), 9);
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Serial.println("** UNDERFLOW **");
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float16 g(1 / 1000000.0);
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Serial.println(g.toDouble(), 9);
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Serial.println();
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}
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// -- END OF FILE --
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