C中的运算符|集合1(算术运算符)

运算符是任何编程语言的基础。因此，如果不使用运算符，C语言的功能是不完整的。运算符允许我们对操作数执行不同类型的运算。在C中，可以将运算符归类为以下类别：

• 算术运算符s(+，-，*，/，％，后递增，前递增，后递减，前递减)
• 关系运算符(==，！=，>，<，> =＆<=)逻辑运算符(&&，||和！)
• 按位运算符(＆，|，^，〜，>>和<<)
• 赋值运算符s(=，+ =，-=，* =等)
• 其他运算符(条件运算符，逗号，sizeof，地址，重定向)

算术运算符：这些运算符用于对操作数执行算术/数学运算。属于此类别的二进制运算符是：

• 加法： ‘+’运算符将两个操作数相加。例如， x + y 。
• 减法： ‘-‘运算符减去两个操作数。例如， xy 。
• 乘法： ‘*’运算符将两个操作数相乘。例如， x * y 。
• 除法： ‘/’运算符将第一个操作数除以第二个操作数。例如， x / y 。
• 模量：当第一个操作数除以第二个操作数时， ‘％’运算符返回余数。例如， x％y 。

C

// C program to demonstrate
// working of binary arithmetic
// operators
#include 
 
int main()
{
    int a = 10, b = 4, res;
 
    // printing a and b
    printf("a is %d and b is %d\n", a, b);
 
    res = a + b; // addition
    printf("a+b is %d\n", res);
 
    res = a - b; // subtraction
    printf("a-b is %d\n", res);
 
    res = a * b; // multiplication
    printf("a*b is %d\n", res);
 
    res = a / b; // division
    printf("a/b is %d\n", res);
 
    res = a % b; // modulus
    printf("a%%b is %d\n", res);
 
    return 0;
}

C++

#include 
using namespace std;
 
int main() {
    int a = 10, b = 4, res;
 
    // printing a and b
    cout<<"a is "<

---

输出：

a is 10 and b is: 4
a+b is: 14
a-b is: 6
a*b is: 40
a/b is: 2
a%b is: 2

属于一元算术运算运算符类别的是：

• 递增： ‘++’运算符用于递增整数的值。当放置在变量名之前(也称为pre-increment 运算符)，其值立即增加。例如， ++ x 。
  并且当将其放在变量名之后(也称为post-increment 运算符)时，其值将暂时保留，直到执行此语句为止，并且在下一个语句执行之前对其进行更新。例如， x ++ 。
• 减： “ – –”运算符用于减少整数值。当放置在变量名(也称为pre-decrement 运算符)之前时，其值立即减小。例如， – – x 。
  并且当将其放在变量名之后(也称为post-decrement运算符)时，其值将暂时保留，直到执行该语句为止，并且在下一个语句执行之前对其进行更新。例如， x – – 。

C

// C program to demonstrate working
// of Unary arithmetic
// operators
#include 
 
int main()
{
    int a = 10, b = 4, res;
 
    // post-increment example:
    // res is assigned 10 only, a is not updated yet
    res = a++;
    printf("a is %d and res is %d\n", a,
           res); // a becomes 11 now
 
    // post-decrement example:
    // res is assigned 11 only, a is not updated yet
    res = a--;
    printf("a is %d and res is %d\n", a,
           res); // a becomes 10 now
 
    // pre-increment example:
    // res is assigned 11 now since
    // a is updated here itself
    res = ++a;
     
    // a and res have same values = 11
    printf("a is %d and res is %d\n", a, res);
 
    // pre-decrement example:
    // res is assigned 10 only since a is updated here
    // itself
    res = --a;
     
    // a and res have same values = 10
    printf("a is %d and res is %d\n", a, res);
 
    return 0;
}

C++

#include 
using namespace std;
 
int main()
{
    int a = 10, b = 4, res;
 
    // post-increment example:
    // res is assigned 10 only,
    // a is not updated yet
    res = a++;
    // a becomes 11 now
    cout << "a is " << a
         << " and res is "
         << res << "\n";
 
    // post-decrement example:
    // res is assigned 11 only,
    // a is not updated yet
    res = a--;
    // a becomes 10 now
    cout << "a is " << a
         << " and res is "
         << res << "\n";
 
    // pre-increment example:
    // res is assigned 11 now
    // since a is updated here itself
    res = ++a;
     
    // a and res have same values = 11
    cout << "a is " << a
         << " and res is "
         << res << "\n";
 
    // pre-decrement example:
    // res is assigned 10 only
    // since a is updated here
    // itself
    res = --a;
    // a and res have same values = 10
    cout << "a is " << a
         << " and res is "
         << res << "\n";
 
    return 0;
}

输出：

a is 11 and res is 10
a is 10 and res is 11
a is 11 and res is 11
a is 10 and res is 10

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