What does if mean in C language?

The if statement in C language is a conditional statement that executes or does not execute a block of code based on specified conditions. The if statement contains a condition that executes the block of code if true, otherwise skips it. A condition can be any expression that returns a Boolean value, such as integer comparisons, floating point comparisons, string comparisons, and logical operations.

The if statement in C language

The if statement is a conditional statement that is used to specify conditions Execute or not execute the code block.

Syntax

if (condition) {
  // condition 为真时执行的代码
}

Usage

The syntax of an if statement contains a condition, which is a Boolean expression. If the condition is true (non-zero), the code block in the if statement is executed. If the condition is false (zero), the code block in the if statement is skipped.

The condition can be any expression that returns a Boolean value. Here are some common conditions:

• Integer comparison: x == 10
• Floating point comparison: y < 2.5
• String comparison: strcmp("hello", "world") == 0
• Logical operation: x > 0 && y < 5

Example

int num = 10;

if (num % 2 == 0) {
  printf("%d 是偶数\n", num);
} else {
  printf("%d 是奇数\n", num);
}

In the above example, the if statement checks whether num is an even number . If so, print a message stating that num is an even number. Otherwise, it will print a message stating that num is an odd number.

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