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Diffstat (limited to 'src/math/example_test.go')
| -rw-r--r-- | src/math/example_test.go | 240 |
1 files changed, 240 insertions, 0 deletions
diff --git a/src/math/example_test.go b/src/math/example_test.go new file mode 100644 index 0000000..9fc1967 --- /dev/null +++ b/src/math/example_test.go @@ -0,0 +1,240 @@ +// Copyright 2017 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package math_test + +import ( + "fmt" + "math" +) + +func ExampleAcos() { + fmt.Printf("%.2f", math.Acos(1)) + // Output: 0.00 +} + +func ExampleAcosh() { + fmt.Printf("%.2f", math.Acosh(1)) + // Output: 0.00 +} + +func ExampleAsin() { + fmt.Printf("%.2f", math.Asin(0)) + // Output: 0.00 +} + +func ExampleAsinh() { + fmt.Printf("%.2f", math.Asinh(0)) + // Output: 0.00 +} + +func ExampleAtan() { + fmt.Printf("%.2f", math.Atan(0)) + // Output: 0.00 +} + +func ExampleAtan2() { + fmt.Printf("%.2f", math.Atan2(0, 0)) + // Output: 0.00 +} + +func ExampleAtanh() { + fmt.Printf("%.2f", math.Atanh(0)) + // Output: 0.00 +} + +func ExampleCopysign() { + fmt.Printf("%.2f", math.Copysign(3.2, -1)) + // Output: -3.20 +} + +func ExampleCos() { + fmt.Printf("%.2f", math.Cos(math.Pi/2)) + // Output: 0.00 +} + +func ExampleCosh() { + fmt.Printf("%.2f", math.Cosh(0)) + // Output: 1.00 +} + +func ExampleSin() { + fmt.Printf("%.2f", math.Sin(math.Pi)) + // Output: 0.00 +} + +func ExampleSincos() { + sin, cos := math.Sincos(0) + fmt.Printf("%.2f, %.2f", sin, cos) + // Output: 0.00, 1.00 +} + +func ExampleSinh() { + fmt.Printf("%.2f", math.Sinh(0)) + // Output: 0.00 +} + +func ExampleTan() { + fmt.Printf("%.2f", math.Tan(0)) + // Output: 0.00 +} + +func ExampleTanh() { + fmt.Printf("%.2f", math.Tanh(0)) + // Output: 0.00 +} + +func ExampleSqrt() { + const ( + a = 3 + b = 4 + ) + c := math.Sqrt(a*a + b*b) + fmt.Printf("%.1f", c) + // Output: 5.0 +} + +func ExampleCeil() { + c := math.Ceil(1.49) + fmt.Printf("%.1f", c) + // Output: 2.0 +} + +func ExampleFloor() { + c := math.Floor(1.51) + fmt.Printf("%.1f", c) + // Output: 1.0 +} + +func ExamplePow() { + c := math.Pow(2, 3) + fmt.Printf("%.1f", c) + // Output: 8.0 +} + +func ExamplePow10() { + c := math.Pow10(2) + fmt.Printf("%.1f", c) + // Output: 100.0 +} + +func ExampleRound() { + p := math.Round(10.5) + fmt.Printf("%.1f\n", p) + + n := math.Round(-10.5) + fmt.Printf("%.1f\n", n) + // Output: + // 11.0 + // -11.0 +} + +func ExampleRoundToEven() { + u := math.RoundToEven(11.5) + fmt.Printf("%.1f\n", u) + + d := math.RoundToEven(12.5) + fmt.Printf("%.1f\n", d) + // Output: + // 12.0 + // 12.0 +} + +func ExampleLog() { + x := math.Log(1) + fmt.Printf("%.1f\n", x) + + y := math.Log(2.7183) + fmt.Printf("%.1f\n", y) + // Output: + // 0.0 + // 1.0 +} + +func ExampleLog2() { + fmt.Printf("%.1f", math.Log2(256)) + // Output: 8.0 +} + +func ExampleLog10() { + fmt.Printf("%.1f", math.Log10(100)) + // Output: 2.0 +} + +func ExampleMod() { + c := math.Mod(7, 4) + fmt.Printf("%.1f", c) + // Output: 3.0 +} + +func ExampleAbs() { + x := math.Abs(-2) + fmt.Printf("%.1f\n", x) + + y := math.Abs(2) + fmt.Printf("%.1f\n", y) + // Output: + // 2.0 + // 2.0 +} +func ExampleDim() { + fmt.Printf("%.2f\n", math.Dim(4, -2)) + fmt.Printf("%.2f\n", math.Dim(-4, 2)) + // Output: + // 6.00 + // 0.00 +} + +func ExampleExp() { + fmt.Printf("%.2f\n", math.Exp(1)) + fmt.Printf("%.2f\n", math.Exp(2)) + fmt.Printf("%.2f\n", math.Exp(-1)) + // Output: + // 2.72 + // 7.39 + // 0.37 +} + +func ExampleExp2() { + fmt.Printf("%.2f\n", math.Exp2(1)) + fmt.Printf("%.2f\n", math.Exp2(-3)) + // Output: + // 2.00 + // 0.12 +} + +func ExampleExpm1() { + fmt.Printf("%.6f\n", math.Expm1(0.01)) + fmt.Printf("%.6f\n", math.Expm1(-1)) + // Output: + // 0.010050 + // -0.632121 +} + +func ExampleTrunc() { + fmt.Printf("%.2f\n", math.Trunc(math.Pi)) + fmt.Printf("%.2f\n", math.Trunc(-1.2345)) + // Output: + // 3.00 + // -1.00 +} + +func ExampleCbrt() { + fmt.Printf("%.2f\n", math.Cbrt(8)) + fmt.Printf("%.2f\n", math.Cbrt(27)) + // Output: + // 2.00 + // 3.00 +} + +func ExampleModf() { + int, frac := math.Modf(3.14) + fmt.Printf("%.2f, %.2f\n", int, frac) + + int, frac = math.Modf(-2.71) + fmt.Printf("%.2f, %.2f\n", int, frac) + // Output: + // 3.00, 0.14 + // -2.00, -0.71 +} |