Show 例子 2
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2023-12-01
下表显示了D语言支持的所有关系运算符。 假设变量A保持10,变量B保持20,则 -
操作者 | 描述 | 例 |
---|---|---|
== | 检查两个操作数的值是否相等,如果是,则条件变为真。 | (A == B)不是真的。 |
!= | 检查两个操作数的值是否相等,如果值不相等则条件变为真。 | (A!= B)是真的。 |
> | 检查左操作数的值是否大于右操作数的值,如果是,则条件变为真。 | (A> B)不是真的。 |
< | 检查左操作数的值是否小于右操作数的值,如果是,则条件变为真。 | (A < B) 为真 |
>= | 检查左操作数的值是否大于或等于右操作数的值,如果是,则条件变为真。 | (A> = B)不是真的。 |
<= | 检查左操作数的值是否小于或等于右操作数的值,如果是,则条件变为真。 | (A <= B)是真的。 |
例子 (Example)
请尝试以下示例以了解D编程语言中可用的所有关系运算符 -
import std.stdio;
int main(string[] args) {
int a = 21;
int b = 10;
int c ;
if( a == b ) {
writefln("Line 1 - a is equal to b\n" );
} else {
writefln("Line 1 - a is not equal to b\n" );
}
if ( a < b ) {
writefln("Line 2 - a is less than b\n" );
} else {
writefln("Line 2 - a is not less than b\n" );
}
if ( a > b ) {
writefln("Line 3 - a is greater than b\n" );
} else {
writefln("Line 3 - a is not greater than b\n" );
}
/* Lets change value of a and b */
a = 5;
b = 20;
if ( a <= b ) {
writefln("Line 4 - a is either less than or equal to b\n" );
}
if ( b >= a ) {
writefln("Line 5 - b is either greater than or equal to b\n" );
}
return 0;
}
编译并执行上述程序时,会产生以下结果 -
Line 1 - a is not equal to b
Line 2 - a is not less than b
Line 3 - a is greater than b
Line 4 - a is either less than or equal to b
Line 5 - b is either greater than or equal to b