The difference between % and / in C language

In C language, % is the modulo operator, which returns the remainder of the division of two operands; / is the division operator, which returns the result of the division of two operands. The modulo operation returns the remainder (int type), while the division operation returns the quotient (floating point type); when both operands are integers, / will perform integer division, which may result in loss of precision; when the floating point operands are of floating point type, the division operation The other operand is converted to floating point to avoid loss of precision.

The difference between % and / in C language

In C language, % and / are two Different operators are used for different purposes:

% Modulo operator

% The operator performs a modulo operation and returns the result of dividing the two operands. remainder. For example:

<code class="c">int x = 10;
int y = 3;
int remainder = x % y; // remainder 将等于 1（10 除以 3 的余数）</code>

Division operator

/ The operator performs a division operation and returns the result of dividing the two operands. For example:

<code class="c">int x = 10;
int y = 3;
int quotient = x / y; // quotient 将等于 3（10 除以 3 的商）</code>

Key differences

The main differences are as follows:

• Return type:The modulo operation returns the remainder (int type), while division returns the quotient (usually a floating point type).
• Integer division: When both operands are integers, the / operator also performs integer division, and the result is truncated to an integer. This may result in loss of accuracy.
• Type conversion: If either operand is a floating point type, the division operation will automatically convert the other operand to a floating point type to avoid loss of precision.

Example

The following example demonstrates the difference between the % and / operators:

<code class="c">int x = 10;
int y = 3;

printf("%d\n", x % y); // 输出 1（余数）
printf("%f\n", x / y); // 输出 3.333333（商）</code>

In the first printf statement , the % operator returns 1 because the remainder of 10 divided by 3 is 1. In the second printf statement, the / operator converts x to a float to preserve the precision of the quotient.

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