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Source file test/235.go

Documentation: test

     1  // run
     2  
     3  // Copyright 2009 The Go Authors. All rights reserved.
     4  // Use of this source code is governed by a BSD-style
     5  // license that can be found in the LICENSE file.
     6  
     7  // Solve the 2,3,5 problem (print all numbers with 2, 3, or 5 as factor) using channels.
     8  // Test the solution, silently.
     9  
    10  package main
    11  
    12  type T chan uint64
    13  
    14  func M(f uint64) (in, out T) {
    15  	in = make(T, 100)
    16  	out = make(T, 100)
    17  	go func(in, out T, f uint64) {
    18  		for {
    19  			out <- f*<-in
    20  		}
    21  	}(in, out, f)
    22  	return in, out
    23  }
    24  
    25  
    26  func min(xs []uint64) uint64 {
    27  	m := xs[0]
    28  	for i := 1; i < len(xs); i++ {
    29  		if xs[i] < m {
    30  			m = xs[i]
    31  		}
    32  	}
    33  	return m
    34  }
    35  
    36  
    37  func main() {
    38  	F := []uint64{2, 3, 5}
    39  	var n = len(F)
    40  	OUT := []uint64{
    41  		2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 16, 18, 20, 24, 25, 27, 30, 32, 36,
    42  		40, 45, 48, 50, 54, 60, 64, 72, 75, 80, 81, 90, 96, 100, 108, 120, 125,
    43  		128, 135, 144, 150, 160, 162, 180, 192, 200, 216, 225, 240, 243, 250,
    44  		256, 270, 288, 300, 320, 324, 360, 375, 384, 400, 405, 432, 450, 480,
    45  		486, 500, 512, 540, 576, 600, 625, 640, 648, 675, 720, 729, 750, 768,
    46  		800, 810, 864, 900, 960, 972, 1000, 1024, 1080, 1125, 1152, 1200, 1215,
    47  		1250, 1280, 1296, 1350, 1440, 1458, 1500, 1536, 1600}
    48  
    49  	x := uint64(1)
    50  	ins := make([]T, n)
    51  	outs := make([]T, n)
    52  	xs := make([]uint64, n)
    53  	for i := 0; i < n; i++ {
    54  		ins[i], outs[i] = M(F[i])
    55  		xs[i] = x
    56  	}
    57  
    58  	for i := 0; i < len(OUT); i++ {
    59  		for i := 0; i < n; i++ {
    60  			ins[i] <- x
    61  		}
    62  
    63  		for i := 0; i < n; i++ {
    64  			if xs[i] == x {
    65  				xs[i] = <-outs[i]
    66  			}
    67  		}
    68  
    69  		x = min(xs)
    70  		if x != OUT[i] {
    71  			println("bad: ", x, " should be ", OUT[i])
    72  			panic("235")
    73  		}
    74  	}
    75  }
    76  

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