C/c++中的模运算符(%)，示例
原文:https://www . geeksforgeeks . org/模-运算符-in-c-cpp-with-examples/
由 % 表示的模运算符是一个算术运算符。 模除法运算符产生整数除法的余数。
语法:如果 x 和 y 是整数，那么表达式:
x % y
当 x 除以 y 时产生余数。
返回值:
例如:考虑以下代码:
C++
// Program to illustrate the
// working of modulo operator
#include <iostream>
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<<result;
return 0;
}
// This code is contributed by Mayank Tyagi
C
// Program to illustrate the
// working of modulo operator
#include <stdio.h>
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;
}
Output
3
1
0
模运算符的限制: 模运算符有相当多的限制。
- %运算符不能应用于浮点数，即浮点数或双精度浮点数。如果试图对浮点常量或变量使用模运算符，编译器将产生一个错误:
C++
// Program to illustrate the
// working of modulo operator
#include <iostream>
using namespace std;
int main()
{
// 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;
cout << result;
return 0;
}
// This code is contributed by Harshit Srivastava
C
// Program to illustrate the
// working of modulo operator
#include <stdio.h>
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;
^
对于负操作数，模运算符结果的符号依赖于机器，因为操作是下溢或上溢的结果。
C++
// Program to illustrate the
// working of the modulo operator
#include <iostream>
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;
x = 4;
y = -2;
result = x % y;
cout << result << endl;
x = -3;
y = -4;
result = x % y;
cout << result;
return 0;
}
// This code is contributed by Harshit Srivastava
C
// Program to illustrate the
// working of the modulo operator
#include <stdio.h>
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;
}
Output
-3
0
-3
注意:有些编译器可能会将表达式的结果显示为 1，有些可能会显示-1。这取决于编译器。
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