What does %.01f mean in C language?

%.01f is the format specifier of the C language printf format string. It is used to print floating point numbers, retaining 1 decimal place after the decimal point, filling it with 0, and the minimum field width is 1. For example, 3.141592 will be formatted as 3.1.

The meaning of %.01f in c language

%.01f is c language A format specifier in the printf format string that specifies how to print a floating point number.

The format specifier consists of:

%: Indicates that this is a format specifier.
.: Specifies the position of the decimal point, followed by a number indicating the number of decimal places left after the decimal point.
0: padding characters, fill with 0 when there are insufficient numbers.
1: Field width, specifies the minimum width of the output field.
f: Indicates that the data type to be printed is a floating point number.

Therefore, %.01f means:

• Print a floating point number.
• Retain one decimal place after the decimal point (e.g. 3.14 will be formatted as 3.1).
• When there are insufficient numbers, fill them with 0.
• Field width is at least 1.

Example:

#include <stdio.h>

int main() {
  float num = 3.141592;
  printf("%.01f\n", num);  // 输出 3.1

  return 0;
}

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