Int rounding rules in c language

The int rounding rules in C language include: truncation and rounding: the decimal part of the division result is discarded. Rounding: Round the decimal part to the nearest whole number. Round up: Round the decimal part up to the smallest integer. Round down: Round the decimal part down to the largest integer.

Int rounding rules in C language

In C language, the int data type is used to store integers. type value. When performing arithmetic operations on int type data, specific rounding rules are applied to ensure the precision and accuracy of the results.

1. Truncation and rounding

This is the default rounding rule. When two integer values ​​are divided, the decimal part is truncated, leaving only the integer part. For example:

<code class="c">int a = 10;
int b = 3;
int result = a / b; // result 为 3</code>

2. Rounding

If you need more precise rounding, you can use rounding rules. Rounding rules round fractional parts to the nearest whole number. For example:

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

int a = 10;
int b = 3;
int result = round(a / b); // result 为 4</code>

3. Round up

The rounding up rule always rounds the decimal part up to the smallest integer. For example:

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

int a = 10;
int b = 3;
int result = ceil(a / b); // result 为 4</code>

4. Rounding down

The rounding down rule always rounds the decimal part down to the largest integer. For example:

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

int a = 10;
int b = 3;
int result = floor(a / b); // result 为 3</code>

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