Tcl-tk-tcl-logical-operators

Tcl-論理演算子

次の表に、Tcl言語でサポートされているすべての論理演算子を示します。 変数 A が1を保持し、変数 B が0を保持すると仮定します-

Operator	Description	Example
&&	Called Logical AND operator. If both the operands are non-zero, then condition becomes true.	(A && B) is false.
Called Logical OR Operator. If any of the two operands is non-zero, then condition becomes true.	(A
B) is true.	!	Called Logical NOT Operator. Use to reverses the logical state of its operand. If a condition is true then Logical NOT operator will make false.

例

Tcl言語で利用可能なすべての論理演算子を理解するために、次の例を試してください-

#!/usr/bin/tclsh

set a  5
set b 20

if { $a && $b } {
   puts "Line 1 - Condition is true\n"
}
if { $a || $b } {
   puts "Line 2 - Condition is true\n"
}
# lets change the value of  a and b
set a  0
set b 10
if { $a && $b } {
   puts "Line 3 - Condition is true\n"
} else {
   puts "Line 3 - Condition is not true\n"
}
if { !($a && $b) } {
   puts "Line 4 - Condition is true\n"
}

上記のプログラムをコンパイルして実行すると、次の結果が生成されます-

Line 1 - Condition is true

Line 2 - Condition is true

Line 3 - Condition is not true

Line 4 - Condition is true