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      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