What does "and:" mean in c++?

Conditional expression operators in C: The ? operator returns one of two values ​​based on a condition. The : operator converts a Boolean expression to an integer value, which is 1 for true and 0 for false.

The ? and:

#C in ? and: operators are used in conditional expressions, Similar to if-else statements in other programming languages.

? Operator

? operator is a ternary operator that returns one of two values ​​based on a conditional Boolean expression. The syntax is:

<code class="cpp">condition ? value_if_true : value_if_false;</code>

where:

• condition is a Boolean expression.
• value_if_true is the value returned if condition is true.
• value_if_false is the value returned if condition is false.

Example:

<code class="cpp">int x = 10;
int result = (x > 5) ? 1 : 0; // result 将为 1，因为 x > 5 为真</code>

: Operator

: The operator is a unary operator, which Convert a Boolean expression to an integer value. The syntax is:

<code class="cpp">!expression;</code>

where:

• expression is a Boolean expression.

The : operator returns 1 if expression is true and 0 if expression is false.

Example:

<code class="cpp">bool flag = true;
int result = :flag; // result 将为 1，因为 flag 为真</code>

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