github.com/yanyiwu/go@v0.0.0-20150106053140-03d6637dbb7f/test/intcvt.go (about)

     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 implicit and explicit conversions of constants.
     8  
     9  package main
    10  
    11  const (
    12  	ci8  = -1 << 7
    13  	ci16 = -1<<15 + 100
    14  	ci32 = -1<<31 + 100000
    15  	ci64 = -1<<63 + 10000000001
    16  
    17  	cu8  = 1<<8 - 1
    18  	cu16 = 1<<16 - 1234
    19  	cu32 = 1<<32 - 1234567
    20  	cu64 = 1<<64 - 1234567890123
    21  
    22  	cf32 = 1e8 + 0.5
    23  	cf64 = -1e8 + 0.5
    24  )
    25  
    26  var (
    27  	i8  int8  = ci8
    28  	i16 int16 = ci16
    29  	i32 int32 = ci32
    30  	i64 int64 = ci64
    31  
    32  	u8  uint8  = cu8
    33  	u16 uint16 = cu16
    34  	u32 uint32 = cu32
    35  	u64 uint64 = cu64
    36  
    37  	//	f32 float32 = 1e8 + 0.5
    38  	//	f64 float64 = -1e8 + 0.5
    39  )
    40  
    41  func chki8(i, v int8) {
    42  	if i != v {
    43  		println(i, "!=", v)
    44  		panic("fail")
    45  	}
    46  }
    47  func chki16(i, v int16) {
    48  	if i != v {
    49  		println(i, "!=", v)
    50  		panic("fail")
    51  	}
    52  }
    53  func chki32(i, v int32) {
    54  	if i != v {
    55  		println(i, "!=", v)
    56  		panic("fail")
    57  	}
    58  }
    59  func chki64(i, v int64) {
    60  	if i != v {
    61  		println(i, "!=", v)
    62  		panic("fail")
    63  	}
    64  }
    65  func chku8(i, v uint8) {
    66  	if i != v {
    67  		println(i, "!=", v)
    68  		panic("fail")
    69  	}
    70  }
    71  func chku16(i, v uint16) {
    72  	if i != v {
    73  		println(i, "!=", v)
    74  		panic("fail")
    75  	}
    76  }
    77  func chku32(i, v uint32) {
    78  	if i != v {
    79  		println(i, "!=", v)
    80  		panic("fail")
    81  	}
    82  }
    83  func chku64(i, v uint64) {
    84  	if i != v {
    85  		println(i, "!=", v)
    86  		panic("fail")
    87  	}
    88  }
    89  //func chkf32(f, v float32) { if f != v { println(f, "!=", v); panic("fail") } }
    90  //func chkf64(f, v float64) { if f != v { println(f, "!=", v); panic("fail") } }
    91  
    92  func main() {
    93  	chki8(int8(i8), ci8&0xff-1<<8)
    94  	chki8(int8(i16), ci16&0xff)
    95  	chki8(int8(i32), ci32&0xff-1<<8)
    96  	chki8(int8(i64), ci64&0xff)
    97  	chki8(int8(u8), cu8&0xff-1<<8)
    98  	chki8(int8(u16), cu16&0xff)
    99  	chki8(int8(u32), cu32&0xff)
   100  	chki8(int8(u64), cu64&0xff)
   101  	//	chki8(int8(f32), 0)
   102  	//	chki8(int8(f64), 0)
   103  
   104  	chki16(int16(i8), ci8&0xffff-1<<16)
   105  	chki16(int16(i16), ci16&0xffff-1<<16)
   106  	chki16(int16(i32), ci32&0xffff-1<<16)
   107  	chki16(int16(i64), ci64&0xffff-1<<16)
   108  	chki16(int16(u8), cu8&0xffff)
   109  	chki16(int16(u16), cu16&0xffff-1<<16)
   110  	chki16(int16(u32), cu32&0xffff)
   111  	chki16(int16(u64), cu64&0xffff-1<<16)
   112  	//	chki16(int16(f32), 0)
   113  	//	chki16(int16(f64), 0)
   114  
   115  	chki32(int32(i8), ci8&0xffffffff-1<<32)
   116  	chki32(int32(i16), ci16&0xffffffff-1<<32)
   117  	chki32(int32(i32), ci32&0xffffffff-1<<32)
   118  	chki32(int32(i64), ci64&0xffffffff)
   119  	chki32(int32(u8), cu8&0xffffffff)
   120  	chki32(int32(u16), cu16&0xffffffff)
   121  	chki32(int32(u32), cu32&0xffffffff-1<<32)
   122  	chki32(int32(u64), cu64&0xffffffff-1<<32)
   123  	//	chki32(int32(f32), 0)
   124  	//	chki32(int32(f64), 0)
   125  
   126  	chki64(int64(i8), ci8&0xffffffffffffffff-1<<64)
   127  	chki64(int64(i16), ci16&0xffffffffffffffff-1<<64)
   128  	chki64(int64(i32), ci32&0xffffffffffffffff-1<<64)
   129  	chki64(int64(i64), ci64&0xffffffffffffffff-1<<64)
   130  	chki64(int64(u8), cu8&0xffffffffffffffff)
   131  	chki64(int64(u16), cu16&0xffffffffffffffff)
   132  	chki64(int64(u32), cu32&0xffffffffffffffff)
   133  	chki64(int64(u64), cu64&0xffffffffffffffff-1<<64)
   134  	//	chki64(int64(f32), 0)
   135  	//	chki64(int64(f64), 0)
   136  
   137  
   138  	chku8(uint8(i8), ci8&0xff)
   139  	chku8(uint8(i16), ci16&0xff)
   140  	chku8(uint8(i32), ci32&0xff)
   141  	chku8(uint8(i64), ci64&0xff)
   142  	chku8(uint8(u8), cu8&0xff)
   143  	chku8(uint8(u16), cu16&0xff)
   144  	chku8(uint8(u32), cu32&0xff)
   145  	chku8(uint8(u64), cu64&0xff)
   146  	//	chku8(uint8(f32), 0)
   147  	//	chku8(uint8(f64), 0)
   148  
   149  	chku16(uint16(i8), ci8&0xffff)
   150  	chku16(uint16(i16), ci16&0xffff)
   151  	chku16(uint16(i32), ci32&0xffff)
   152  	chku16(uint16(i64), ci64&0xffff)
   153  	chku16(uint16(u8), cu8&0xffff)
   154  	chku16(uint16(u16), cu16&0xffff)
   155  	chku16(uint16(u32), cu32&0xffff)
   156  	chku16(uint16(u64), cu64&0xffff)
   157  	//	chku16(uint16(f32), 0)
   158  	//	chku16(uint16(f64), 0)
   159  
   160  	chku32(uint32(i8), ci8&0xffffffff)
   161  	chku32(uint32(i16), ci16&0xffffffff)
   162  	chku32(uint32(i32), ci32&0xffffffff)
   163  	chku32(uint32(i64), ci64&0xffffffff)
   164  	chku32(uint32(u8), cu8&0xffffffff)
   165  	chku32(uint32(u16), cu16&0xffffffff)
   166  	chku32(uint32(u32), cu32&0xffffffff)
   167  	chku32(uint32(u64), cu64&0xffffffff)
   168  	//	chku32(uint32(f32), 0)
   169  	//	chku32(uint32(f64), 0)
   170  
   171  	chku64(uint64(i8), ci8&0xffffffffffffffff)
   172  	chku64(uint64(i16), ci16&0xffffffffffffffff)
   173  	chku64(uint64(i32), ci32&0xffffffffffffffff)
   174  	chku64(uint64(i64), ci64&0xffffffffffffffff)
   175  	chku64(uint64(u8), cu8&0xffffffffffffffff)
   176  	chku64(uint64(u16), cu16&0xffffffffffffffff)
   177  	chku64(uint64(u32), cu32&0xffffffffffffffff)
   178  	chku64(uint64(u64), cu64&0xffffffffffffffff)
   179  	//	chku64(uint64(f32), 0)
   180  	//	chku64(uint64(f64), 0)
   181  }