What does %.1 mean in C language?

In the printf() function of C language, %.1 represents the floating-point variable output format, specifying one digit after the decimal point.

The meaning of %.1 in C language

%.1 is in the printf() function in C language Commonly used format specifiers. It is used to specify the output format of floating point variables.

Detailed description:

• % means to output a variable.
• . is used to separate the numbers before the decimal point and the numbers after the decimal point.
• 1 means outputting one digit after the decimal point.

Example:

<code class="c">#include <stdio.h>

int main() {
  float num = 3.141592;
  printf("小数点后一位：%.1f\n", num);
  return 0;
}</code>

Output:

<code>小数点后一位：3.1</code>

In the above example, the printf() function uses the %.1f format specification The symbol outputs the floating-point variable num to one decimal place. Therefore, the output is 3.1.

Note:

• %.1 is only applicable to floating-point variables. For integer variables, you can use the %d format specifier.
• If there are no digits after the decimal point, the output is 0.
• If there is more than one digit after the decimal point, the extra digits will be truncated.

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