📜  C / C++中的模运算符(%)及其示例

📅  最后修改于: 2021-05-04 23:29:45             🧑  作者: Mango

表示的模运算符是算术运算运算符。
模除法运算符产生整数除法的数。

语法:如果x和y是整数,则表达式:

x % y

当x除以y时,产生余数。

返回值:

  • 如果y将x完全除,则表达式的结果为0。
  • 如果x不能被y整除,则结果将是[1,x-1]范围内的余数。
  • 如果x为0,则被零除是编译时错误。

例如:考虑以下代码:

C
// Program to illustrate the
// working of modulo operator
 
#include 
 
int main(void)
{
 
    // To store two integer values
    int x, y;
 
    // To store the result of
    // the modulo expression
    int result;
 
    x = 3;
    y = 4;
    result = x % y;
    printf("%d", result);
 
    result = y % x;
    printf("\n%d", result);
 
    x = 4;
    y = 2;
    result = x % y;
    printf("\n%d", result);
 
    return 0;
}


C++
// Program to illustrate the
// working of modulo operator
#include 
using namespace std;
 
int main(void)
{
 
    // To store two integer values
    int x, y;
 
    // To store the result of
    // the modulo expression
    int result;
 
    x = 3;
    y = 4;
    result = x % y;
    cout << result << endl;
 
    result = y % x;
    cout << result << endl;
 
    x = 4;
    y = 2;
    result = x % y;
    cout<


C
// Program to illustrate the
// working of modulo operator
 
#include 
 
int main(void)
{
 
    // To store two integer values
    float x, y;
 
    // To store the result of
    // the modulo expression
    float result;
 
    x = 2.3;
    y = 1.5;
    result = x % y;
    printf("%f", result);
 
    return 0;
}


C
// Program to illustrate the
// working of the modulo operator
 
#include 
 
int main(void)
{
 
    // To store two integer values
    int x, y;
 
    // To store the result of
    // the modulo expression
    int result;
 
    x = -3;
    y = 4;
    result = x % y;
    printf("%d", result);
 
    x = 4;
    y = -2;
    result = x % y;
    printf("\n%d", result);
 
    x = -3;
    y = -4;
    result = x % y;
    printf("\n%d", result);
 
    return 0;
}


输出
3
1
0

模运算符的限制:
模运算符有很多限制。

  1. %运算符不能应用于浮点数,即浮点数或双精度数。如果您尝试将模运算符与浮点常量或变量一起使用,则编译器将产生错误:

C

// Program to illustrate the
// working of modulo operator
 
#include 
 
int main(void)
{
 
    // To store two integer values
    float x, y;
 
    // To store the result of
    // the modulo expression
    float result;
 
    x = 2.3;
    y = 1.5;
    result = x % y;
    printf("%f", result);
 
    return 0;
}

编译错误:

Compilation Error in C code :- prog.c: In function 'main':
prog.c:19:16: error:
 invalid operands to binary % (have 'float' and 'float')
     result = x % y;
                ^           

取模运算符的结果符号与机器有关的负操作数有关,因为该操作是下溢或上溢的结果。

C

// Program to illustrate the
// working of the modulo operator
 
#include 
 
int main(void)
{
 
    // To store two integer values
    int x, y;
 
    // To store the result of
    // the modulo expression
    int result;
 
    x = -3;
    y = 4;
    result = x % y;
    printf("%d", result);
 
    x = 4;
    y = -2;
    result = x % y;
    printf("\n%d", result);
 
    x = -3;
    y = -4;
    result = x % y;
    printf("\n%d", result);
 
    return 0;
}
输出
-3
0
-3

注意:一些编译器可能会将表达式的结果显示为1,而另一些可能会显示-1。这取决于编译器。