What does fi mean in C language?

The fi macro in C language represents infinity. It is a floating-point macro used to represent positive or negative infinity. Its uses include: 1. Representing mathematical infinity; 2. As a comparison Operand, used to determine whether other floating point numbers are infinity; 3. Prevent arithmetic overflow.

The meaning of fi in C language

fi is a macro that represents infinity in C language. It is defined as a float type, representing an infinite floating point number, usually used to represent positive or negative infinity values.

Uses

fi is usually used for the following purposes:

• represents infinity: fi can be used to represent mathematics Infinity on, for example, represents an asymptote in a mathematical function.
• As a comparison operand: fi can be used to compare with other floating point numbers to determine whether they are negative infinity or positive infinity.
• Prevent arithmetic overflow: When floating point operation may cause overflow, fi can be used to limit the result to prevent the program from crashing.

Syntax

The fi macro can be used directly as a floating point number or compared with other floating point numbers. For example:

#include <float.h>

int main() {
  float x = FLT_MAX; // 最大正浮点数

  if (x < FLT_MAX) {
    printf("x is not infinity.\n");
  } else if (x == FLT_MAX) {
    printf("x is positive infinity.\n");
  } else if (x == -FLT_MAX) {
    printf("x is negative infinity.\n");
  }

  return 0;
}

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