C language Conditional operator detailed explanation of _c language

If you want to get the largest of the two numbers, you can use the IF statement, for example:

if (a>b) {
  max = A;
} else{
  max = b;
}

However, the C language provides a simpler method, called the conditional operator, with the syntax format:

Expression of 1? Expression 2: Expression 3

The conditional operator is the only three-mesh operator in the C language whose evaluation rule is: If the value of the expression 1 is true, the value of the expression 2 is used as the value of the entire conditional expression, otherwise the value of the expression 3 is the value of the entire conditional expression. A conditional expression is usually used in an assignment statement.

The If Else statement above is equivalent to:

max = (a>b)? A:B;

The semantics of the statement is that, if A>b is true, A is given to Max, or B is given to Max. The reader can assume that the conditional operator is a shorthand if else, and can be replaced entirely with if else.

When you use conditional expressions, you should also note the following points:

1 The precedence of the conditional operator is lower than the relational and arithmetic operators, but is higher than the assignment character. So

max= (a>b)? A:B;

You can remove parentheses and write as

Max=a>b? A:B;

2 The conditional operator? And: is a pair of operators that cannot be used separately.

3 The binding direction of the conditional operator is from right to left. For example:

A>b? A:c>d? C:d;

Should be understood as:

A>b? A: (C>d c:d);

This is the case where the conditional expression is nested, where the expression is a conditional expression.

To reprogram with a conditional expression to output the maximum value of two digits:

#include <stdio.h>
int main () {
  int A, b;
  printf ("Input two numbers:");
  scanf ("%d%d", &a, &b);
  printf ("max=%d\n", a>b?a:b);
  return 0;
}

Run Result:

Input two numbers:23 45
Max=45

The above is the C language conditional operator knowledge of the explanation, the need for friends can refer to.