How to retain 1 decimal place in C language

In C language, the methods of retaining one decimal place are: 1. Use a fixed decimal point to format "%.1f"; 2. Use the round() function to round to one decimal place; 3. Use customization Format specifications to one decimal place.

How to retain one decimal place in C language

In C language, retaining one decimal place can be used The following methods:

1. Use fixed decimal point formatting:

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

int main() {
  float number = 123.456;

  // 使用 "%.1f" 格式化指定保留一位小数
  printf("%.1f\n", number);  // 输出：123.5
  return 0;
}</code>

2. Use the round() function:

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

int main() {
  float number = 123.456;

  // 使用 round() 函数四舍五入到一位小数
  number = roundf(number * 10) / 10;
  printf("%.1f\n", number);  // 输出：123.5
  return 0;
}</code>

3. Use customized formatting:

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

int main() {
  float number = 123.456;

  char format[] = "%.1f";
  printf(format, number);  // 输出：123.5
  return 0;
}</code>

Among the above methods, using fixed decimal point formatting is the simplest method because it does not require additional library functions or customized formatting operate.

Note:

• For floating point numbers, decimal operations that retain a specified number of digits may result in loss of precision.
• For situations where strict precision requirements are required, it is recommended to use a decimal arithmetic library (such as GMP or Boost.Multiprecision).

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