Simple analysis of C # operation Fu Zhi ternary operator _c# Tutorial

C # operation Fu Zhi ternary operator "?:" What is it?

C # Operations Fu Zhi The ternary operator "?:" is sometimes called a conditional operator.

For conditional expression b?x:y, the condition B is evaluated first and then judged.

If the value of B is true, the value of x is computed and the result of the operation is the value of x, otherwise, y is computed with a value of Y.

A conditional expression never computes X, and also calculates Y. The conditional operator is associated to the right, that is, the grouping is computed from left to right.

C # operations Fu Zhi ternary operator "?:" Action instance:

The expression a?b:c?d:e will be executed in the form of A?b: (c?d:e).

?: The second and third operands control the type of the conditional expression. Set X and Y to be the type of the second and third operands, respectively, then:

If x and Y are the same type, then the type is the type of the conditional expression.

Otherwise, if there is an implicit conversion from X to Y, but there is no conversion of Y to X, then Y is the type of the conditional expression.

Otherwise, if there is an implicit conversion from Y to X, but there is no conversion of x to Y, then X is the type of the conditional expression.

Otherwise, no expression type is defined, and a compile-time error occurs

C # operation Fu Zhi ternary operator "?:" the basic content to introduce you here, hope to you understand and learn C # operation Fu Zhi ternary operator "?:" is helpful.

The ternary operator also becomes a conditional operator, and he appears to be more special because there are three operands, but he does belong to an operator.
Its form as
Boolean-exp?value0:value1
If the BOOLEAN-EXP expression evaluates to True, the VALUE0 is computed and the result is the resulting value of the operator. If the BOOLEAN-EXP expression evaluates to False, the value1 is computed, and likewise his result becomes the final value of the operator.
Of course it can also be replaced by If-else, but the ternary operator and If-else are completely different, operators will produce a value.

Copy Code code as follows:

public class ternaryifelse{
static int ternary (int i) {
Return i<10?i*100:i*10;
}
static int standardifelse (int i) {
if (i<10)
return i*100;
Else
return i*10;
}
public static void Main (String [] args) {
System.out.println (Ternary (9));
System.out.println (Ternary (10));
System.out.println Standardifelse ((9));
System.out.println Standardifelse ((10));
}
}

Output
900
100
900
100
In contrast, ternary operators are much more compact and if-else easier to understand.