运算符
表达式
算术运算符
//// 算术运算符示例//std::cout << A + B << std::endl; // 30//cout << A - B << endl; // -10//cout << A*B << endl; // 200//cout << B / A << endl; // 2//cout << 15 / A << endl; // 1//cout << 15.0 / A << endl; // 1.5//cout << B%A << endl; // 0//cout << ++A << endl; // 11//cout << A << endl; // 11//cout << --A << endl; // 10//cout << A << endl; // 10
关系运算符
//// 关系运算符示例//cout << (A == B) << endl; // 0//cout << (A != B) << endl; // 1//cout << (A > B) << endl; // 0//cout << (A < B) << endl; // 1//cout << (A >= B) << endl; // 0//cout << (A <= B) << endl; // 1
逻辑运算符
//// 逻辑运算符示例//bool bA = false, bB = true;//// to be or not to be//cout << ( bA == true || bA != true ) << endl; // 1//cout << (bB == true || bB != true) << endl; // 1//// 德*摩根率//assert( !(bA || bB) == (!bA && !bB) ); // 1//assert( !(bA && bB) == (!bA || !bB) ); // 1//bA = false, bB = false;//assert( !(bA || bB) == (!bA && !bB) ); // 1//assert( !(bA && bB) == (!bA || !bB) ); // 1//bA = true, bB = true;//assert( !(bA || bB) == (!bA && !bB) ); // 1//assert( !(bA && bB) == (!bA || !bB) ); // 1//bA = true, bB = false;//assert( !(bA || bB) == (!bA && !bB) ); // 1//assert( !(bA && bB) == (!bA || !bB) ); // 1
赋值运算符
//// 赋值运算符//int C = A + B;//cout << C << endl;//C += A;//cout << C << endl;//C -= A;//cout << C << endl;//C *= A;//cout << C << endl;//C /= A;//cout << C << endl;//C %= A;//cout << C << endl;//C <<= A;//cout << C << endl;//C >>= A;//cout << C << endl;//C &= A;//cout << C << endl;//C ^= A;//cout << C << endl;//C |= A;//cout << C << endl;
位运算符
// 位运算//cout << (A&B) << endl; // 01010 & 10100 = 00000 ==> 0//cout << (A | B) << endl; // 01010 | 10100 = 11110 ==> 30//cout << (A^B) << endl; // 01010 ^ 10100 = 11110 ==> 30//cout << (~A) << endl; // ~0000000000001010 = 11111111111110101 ==> 0000000000001011 ==》 -11//cout << (A << 2) << endl; // 00001010 << 2 ==> 00101000 ==> 40//cout << (A >> 2) << endl;// 00001010 >> 2 ==> 00000010 ==> 2
杂项运算符
运算符优先级
// 杂项运算符示例//cout << sizeof(A) << endl; // 4//int C = A > B ? 1 : 0;//cout << C << endl; // 0//int D = A < B ? 1 : 0;//cout << D << endl; // 1//int E = (A, B, C);//cout << E << endl; // 0//float F = float(E);//cout << F << endl; // 0//cout << &F << endl; // 0xFFXXX//float * P = &F;//cout << P << endl; // 0xFFXXX//cout << *P << endl; // 0//typedef struct {// short Sunday = 0;// short Monday = 1;// short Tuesday = 2;// short Wednesday = 3;// short Thursday = 4;// short Friday = 5;// short Saturday = 6;//} Week;//Week w;//cout << w.Friday << endl; // 5//cout << sizeof(w) << endl; // ?
注释
补码
UMax 无符号数
TMin 有符号位最小值
TMax 有符号最大值
字节序
所有代码
# include <assert.h># include <iostream>using namespace std;// 二进制转无符号整型unsigned int B2U(unsigned int num){return (unsigned int)(num);}// 二进制转有符号整型int B2T(int num){return (int)(num);}int main(){int A = 10;int B = 20;//// 算术运算符示例//std::cout << A + B << std::endl; // 30//cout << A - B << endl; // -10//cout << A*B << endl; // 200//cout << B / A << endl; // 2//cout << 15 / A << endl; // 1//cout << 15.0 / A << endl; // 1.5//cout << B%A << endl; // 0//cout << ++A << endl; // 11//cout << A << endl; // 11//cout << --A << endl; // 10//cout << A << endl; // 10//// 关系运算符示例//cout << (A == B) << endl; // 0//cout << (A != B) << endl; // 1//cout << (A > B) << endl; // 0//cout << (A < B) << endl; // 1//cout << (A >= B) << endl; // 0//cout << (A <= B) << endl; // 1//// 逻辑运算符示例//bool bA = false, bB = true;//// to be or not to be//cout << ( bA == true || bA != true ) << endl; // 1//cout << (bB == true || bB != true) << endl; // 1//// 德*摩根率//assert( !(bA || bB) == (!bA && !bB) ); // 1//assert( !(bA && bB) == (!bA || !bB) ); // 1//bA = false, bB = false;//assert( !(bA || bB) == (!bA && !bB) ); // 1//assert( !(bA && bB) == (!bA || !bB) ); // 1//bA = true, bB = true;//assert( !(bA || bB) == (!bA && !bB) ); // 1//assert( !(bA && bB) == (!bA || !bB) ); // 1//bA = true, bB = false;//assert( !(bA || bB) == (!bA && !bB) ); // 1//assert( !(bA && bB) == (!bA || !bB) ); // 1// 位运算//cout << (A&B) << endl; // 01010 & 10100 = 00000 ==> 0//cout << (A | B) << endl; // 01010 | 10100 = 11110 ==> 30//cout << (A^B) << endl; // 01010 ^ 10100 = 11110 ==> 30//cout << (~A) << endl; // ~0000000000001010 = 11111111111110101 ==> 0000000000001011 ==》 -11//cout << (A << 2) << endl; // 00001010 << 2 ==> 00101000 ==> 40//cout << (A >> 2) << endl;// 00001010 >> 2 ==> 00000010 ==> 2//// 赋值运算符//int C = A + B;//cout << C << endl;//C += A;//cout << C << endl;//C -= A;//cout << C << endl;//C *= A;//cout << C << endl;//C /= A;//cout << C << endl;//C %= A;//cout << C << endl;//C <<= A;//cout << C << endl;//C >>= A;//cout << C << endl;//C &= A;//cout << C << endl;//C ^= A;//cout << C << endl;//C |= A;//cout << C << endl;// 杂项运算符示例//cout << sizeof(A) << endl; // 4//int C = A > B ? 1 : 0;//cout << C << endl; // 0//int D = A < B ? 1 : 0;//cout << D << endl; // 1//int E = (A, B, C);//cout << E << endl; // 0//float F = float(E);//cout << F << endl; // 0//cout << &F << endl; // 0xFFXXX//float * P = &F;//cout << P << endl; // 0xFFXXX//cout << *P << endl; // 0//typedef struct {// short Sunday = 0;// short Monday = 1;// short Tuesday = 2;// short Wednesday = 3;// short Thursday = 4;// short Friday = 5;// short Saturday = 6;//} Week;//Week w;//cout << w.Friday << endl; // 5//cout << sizeof(w) << endl; // ?// 补码机器数调整展示//int i1 = 0;//int i2 = -1;//int i3 = -2147483648;//int i4 = 2147483647;//unsigned int u1 = 0;//unsigned int u2 = 4294967295;//unsigned int u3 = 2147483648;//unsigned int u4 = 2147483647;// 补码的真值验证cout << B2T(0x00000000) << endl;cout << B2T(0xFFFFFFFF) << endl;cout << B2T(0x80000000) << endl;cout << B2T(0x7FFFFFFF) << endl;cout << endl;cout << B2U(0x00000000) << endl;cout << B2U(0xFFFFFFFF) << endl;cout << B2U(0x80000000) << endl;cout << B2U(0x7FFFFFFF) << endl;return 0;}
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