go string 源码
golang string 代码
文件路径：/test/ken/string.go
// run
// Copyright 2009 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 string operations including printing.
package main
func main() {
var c string
a := `abc`
b := `xyz`
/* print a literal */
print(`abc`)
/* print a variable */
print(b, "-")
/* catenate literals */
print(`abc`+`xyz`, "-")
/* catenate variables */
print(a+b, "-")
/* compare literals */
if `abc` == `xyz` || `abc` != "abc" || `abc` > `xyz` {
panic("compare literals")
}
/* compare variables */
if a == b || a != a || a > b {
panic("compare variables")
}
/* cat */
c = a + b
print(c, "-")
/* catequal */
c = a
c += b
print(c, "-")
/* clumsy evaluation */
c = b
c = a + c
print(c, "-")
/* len */
if len(c) != 6 {
print("len ", len(c))
panic("fail")
}
/* index strings */
for i := 0; i < len(c); i = i + 1 {
if c[i] != (a + b)[i] {
print("index ", i, " ", c[i], " ", (a + b)[i])
panic("fail")
}
}
/* slice strings */
print(c[0:3], c[3:])
print("\n")
/* create string with integer constant */
c = string('x')
if c != "x" {
panic("create int " + c)
}
/* create string with integer variable */
v := 'x'
c = string(v)
if c != "x" {
panic("create int " + c)
}
/* create string with byte array */
var z1 [3]byte
z1[0] = 'a'
z1[1] = 'b'
z1[2] = 'c'
c = string(z1[0:])
if c != "abc" {
panic("create byte array " + c)
}
/* create string with int array */
var z2 [3]rune
z2[0] = 'a'
z2[1] = '\u1234'
z2[2] = 'c'
c = string(z2[0:])
if c != "a\u1234c" {
panic("create int array " + c)
}
/* create string with byte array pointer */
z3 := new([3]byte)
z3[0] = 'a'
z3[1] = 'b'
z3[2] = 'c'
c = string(z3[0:])
if c != "abc" {
panic("create array pointer " + c)
}
}
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