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Source file test/float_lit.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  // Test floating-point literal syntax.
     8  
     9  package main
    10  
    11  var bad bool
    12  
    13  func pow10(pow int) float64 {
    14  	if pow < 0 {
    15  		return 1 / pow10(-pow)
    16  	}
    17  	if pow > 0 {
    18  		return pow10(pow-1) * 10
    19  	}
    20  	return 1
    21  }
    22  
    23  func close(da float64, ia, ib int64, pow int) bool {
    24  	db := float64(ia) / float64(ib)
    25  	db *= pow10(pow)
    26  
    27  	if da == 0 || db == 0 {
    28  		if da == 0 && db == 0 {
    29  			return true
    30  		}
    31  		return false
    32  	}
    33  
    34  	de := (da - db) / da
    35  	if de < 0 {
    36  		de = -de
    37  	}
    38  
    39  	if de < 1e-14 {
    40  		return true
    41  	}
    42  	if !bad {
    43  		println("BUG")
    44  		bad = true
    45  	}
    46  	return false
    47  }
    48  
    49  func main() {
    50  	if !close(0., 0, 1, 0) {
    51  		print("0. is ", 0., "\n")
    52  	}
    53  	if !close(+10., 10, 1, 0) {
    54  		print("+10. is ", +10., "\n")
    55  	}
    56  	if !close(-210., -210, 1, 0) {
    57  		print("-210. is ", -210., "\n")
    58  	}
    59  
    60  	if !close(.0, 0, 1, 0) {
    61  		print(".0 is ", .0, "\n")
    62  	}
    63  	if !close(+.01, 1, 100, 0) {
    64  		print("+.01 is ", +.01, "\n")
    65  	}
    66  	if !close(-.012, -12, 1000, 0) {
    67  		print("-.012 is ", -.012, "\n")
    68  	}
    69  
    70  	if !close(0.0, 0, 1, 0) {
    71  		print("0.0 is ", 0.0, "\n")
    72  	}
    73  	if !close(+10.01, 1001, 100, 0) {
    74  		print("+10.01 is ", +10.01, "\n")
    75  	}
    76  	if !close(-210.012, -210012, 1000, 0) {
    77  		print("-210.012 is ", -210.012, "\n")
    78  	}
    79  
    80  	if !close(0E+1, 0, 1, 0) {
    81  		print("0E+1 is ", 0E+1, "\n")
    82  	}
    83  	if !close(+10e2, 10, 1, 2) {
    84  		print("+10e2 is ", +10e2, "\n")
    85  	}
    86  	if !close(-210e3, -210, 1, 3) {
    87  		print("-210e3 is ", -210e3, "\n")
    88  	}
    89  
    90  	if !close(0E-1, 0, 1, 0) {
    91  		print("0E-1 is ", 0E-1, "\n")
    92  	}
    93  	if !close(+0e23, 0, 1, 1) {
    94  		print("+0e23 is ", +0e23, "\n")
    95  	}
    96  	if !close(-0e345, 0, 1, 1) {
    97  		print("-0e345 is ", -0e345, "\n")
    98  	}
    99  
   100  	if !close(0E1, 0, 1, 1) {
   101  		print("0E1 is ", 0E1, "\n")
   102  	}
   103  	if !close(+10e23, 10, 1, 23) {
   104  		print("+10e23 is ", +10e23, "\n")
   105  	}
   106  	if !close(-210e34, -210, 1, 34) {
   107  		print("-210e34 is ", -210e34, "\n")
   108  	}
   109  
   110  	if !close(0.E1, 0, 1, 1) {
   111  		print("0.E1 is ", 0.E1, "\n")
   112  	}
   113  	if !close(+10.e+2, 10, 1, 2) {
   114  		print("+10.e+2 is ", +10.e+2, "\n")
   115  	}
   116  	if !close(-210.e-3, -210, 1, -3) {
   117  		print("-210.e-3 is ", -210.e-3, "\n")
   118  	}
   119  
   120  	if !close(.0E1, 0, 1, 1) {
   121  		print(".0E1 is ", .0E1, "\n")
   122  	}
   123  	if !close(+.01e2, 1, 100, 2) {
   124  		print("+.01e2 is ", +.01e2, "\n")
   125  	}
   126  	if !close(-.012e3, -12, 1000, 3) {
   127  		print("-.012e3 is ", -.012e3, "\n")
   128  	}
   129  
   130  	if !close(0.0E1, 0, 1, 0) {
   131  		print("0.0E1 is ", 0.0E1, "\n")
   132  	}
   133  	if !close(+10.01e2, 1001, 100, 2) {
   134  		print("+10.01e2 is ", +10.01e2, "\n")
   135  	}
   136  	if !close(-210.012e3, -210012, 1000, 3) {
   137  		print("-210.012e3 is ", -210.012e3, "\n")
   138  	}
   139  
   140  	if !close(0.E+12, 0, 1, 0) {
   141  		print("0.E+12 is ", 0.E+12, "\n")
   142  	}
   143  	if !close(+10.e23, 10, 1, 23) {
   144  		print("+10.e23 is ", +10.e23, "\n")
   145  	}
   146  	if !close(-210.e33, -210, 1, 33) {
   147  		print("-210.e33 is ", -210.e33, "\n")
   148  	}
   149  
   150  	if !close(.0E-12, 0, 1, 0) {
   151  		print(".0E-12 is ", .0E-12, "\n")
   152  	}
   153  	if !close(+.01e23, 1, 100, 23) {
   154  		print("+.01e23 is ", +.01e23, "\n")
   155  	}
   156  	if !close(-.012e34, -12, 1000, 34) {
   157  		print("-.012e34 is ", -.012e34, "\n")
   158  	}
   159  
   160  	if !close(0.0E12, 0, 1, 12) {
   161  		print("0.0E12 is ", 0.0E12, "\n")
   162  	}
   163  	if !close(+10.01e23, 1001, 100, 23) {
   164  		print("+10.01e23 is ", +10.01e23, "\n")
   165  	}
   166  	if !close(-210.012e33, -210012, 1000, 33) {
   167  		print("-210.012e33 is ", -210.012e33, "\n")
   168  	}
   169  
   170  	if !close(0.E123, 0, 1, 123) {
   171  		print("0.E123 is ", 0.E123, "\n")
   172  	}
   173  	if !close(+10.e+23, 10, 1, 23) {
   174  		print("+10.e+234 is ", +10.e+234, "\n")
   175  	}
   176  	if !close(-210.e-35, -210, 1, -35) {
   177  		print("-210.e-35 is ", -210.e-35, "\n")
   178  	}
   179  
   180  	if !close(.0E123, 0, 1, 123) {
   181  		print(".0E123 is ", .0E123, "\n")
   182  	}
   183  	if !close(+.01e29, 1, 100, 29) {
   184  		print("+.01e29 is ", +.01e29, "\n")
   185  	}
   186  	if !close(-.012e29, -12, 1000, 29) {
   187  		print("-.012e29 is ", -.012e29, "\n")
   188  	}
   189  
   190  	if !close(0.0E123, 0, 1, 123) {
   191  		print("0.0E123 is ", 0.0E123, "\n")
   192  	}
   193  	if !close(+10.01e31, 1001, 100, 31) {
   194  		print("+10.01e31 is ", +10.01e31, "\n")
   195  	}
   196  	if !close(-210.012e19, -210012, 1000, 19) {
   197  		print("-210.012e19 is ", -210.012e19, "\n")
   198  	}
   199  
   200  	if bad {
   201  		panic("float_lit")
   202  	}
   203  }
   204  

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