go/test/ken/string.go

// $G $D/$F.go && $L $F.$A && ./$A.out

// 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.


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 {
		panic "len ", len(c);
	}

	/* index strings */
	for i:=0; i<len(c); i=i+1 {
		if c[i] != (a+b)[i] {
			panic "index ", i, " ", c[i], " ", (a+b)[i];
		}
	}

	/* slice strings */
	print c[0:3], c[3:6];

	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 z [3]byte;
	z[0] = 'a';
	z[1] = 'b';
	z[2] = 'c';
	c = string(z);
	if c != "abc" {
		panic "create array ", c;
	}

	/* create string with byte array pointer */
	z := new([3]byte);
	z[0] = 'a';
	z[1] = 'b';
	z[2] = 'c';
	c = string(z);
	if c != "abc" {
		panic "create array pointer ", c;
	}
}