Lua语法--07运算符

黄振国

#算术运算符
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#!/usr/local/bin/lua

a = 21
b = 10
c = a + b
print("Line 1 - c 的值为 ", c )
c = a - b
print("Line 2 - c 的值为 ", c )
c = a * b
print("Line 3 - c 的值为 ", c )
c = a / b
print("Line 4 - c 的值为 ", c )
c = a % b
print("Line 5 - c 的值为 ", c )
c = a^2
print("Line 6 - c 的值为 ", c )
c = -a
print("Line 7 - c 的值为 ", c )
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黄振国

#关系运算符
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#!/usr/local/bin/lua

a = 21
b = 10

if( a == b )
then
   print("Line 1 - a 等于 b" )
else
   print("Line 1 - a 不等于 b" )
end

if( a ~= b )
then
   print("Line 2 - a 不等于 b" )
else
   print("Line 2 - a 等于 b" )
end

if ( a < b )
then
   print("Line 3 - a 小于 b" )
else
   print("Line 3 - a 大于等于 b" )
end

if ( a > b )
then
   print("Line 4 - a 大于 b" )
else
   print("Line 5 - a 小于等于 b" )
end

-- 修改 a 和 b 的值
a = 5
b = 20
if ( a <= b )
then
   print("Line 5 - a 小于等于  b" )
end

if ( b >= a )
then
   print("Line 6 - b 大于等于 a" )
end
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黄振国

#逻辑运算符
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#!/usr/local/bin/lua

a = true
b = true

if ( a and b )
then
   print("a and b - 条件为 true" )
end

if ( a or b )
then
   print("a or b - 条件为 true" )
end

print("---------分割线---------" )

-- 修改 a 和 b 的值
a = false
b = true

if ( a and b )
then
   print("a and b - 条件为 true" )
else
   print("a and b - 条件为 false" )
end

if ( not( a and b) )
then
   print("not( a and b) - 条件为 true" )
else
   print("not( a and b) - 条件为 false" )
end
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黄振国

#其他运算符
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#!/usr/local/bin/lua

a = "Hello "
b = "World"

print("连接字符串 a 和 b ", a..b )

print("b 字符串长度 ",#b )

print("字符串 Test 长度 ",#"Test" )

print("菜鸟教程网址长度 ",#"www.runoob.com" )
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