go cplx4 源码
golang cplx4 代码
文件路径：/test/ken/cplx4.go
// run
// Copyright 2010 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.
// Test complex numbers,including fmt support.
// Used to crash.
package main
import "fmt"
const (
R = 5
I = 6i
C1 = R + I // ADD(5,6)
)
func want(s, w string) {
if s != w {
panic(s + " != " + w)
}
}
func doprint(c complex128, w string) {
s := fmt.Sprintf("%f", c)
want(s, w)
}
func main() {
// constants
s := fmt.Sprintf("%f", -C1)
want(s, "(-5.000000-6.000000i)")
doprint(C1, "(5.000000+6.000000i)")
// variables
c1 := C1
s = fmt.Sprintf("%f", c1)
want(s, "(5.000000+6.000000i)")
doprint(c1, "(5.000000+6.000000i)")
// 128
c2 := complex128(C1)
s = fmt.Sprintf("%G", c2)
want(s, "(5+6i)")
// real, imag, complex
c3 := complex(real(c2)+3, imag(c2)-5) + c2
s = fmt.Sprintf("%G", c3)
want(s, "(13+7i)")
// compiler used to crash on nested divide
c4 := complex(real(c3/2), imag(c3/2))
if c4 != c3/2 {
fmt.Printf("BUG: c3 = %G != c4 = %G\n", c3, c4)
panic(0)
}
}
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