C++ 学习笔记

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已于 2022-03-16 15:53:55 修改 · 881 阅读

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#c++ #学习 #算法

于 2022-03-16 12:36:55 首次发布

Less-1：

#include <iostream>
using namespace std;
int main()
{
   
   
    cout << "Hello World";
    return 0;
}

Less-2 :

#include<iostream>
#include<limits>

using namespace std;

extern int a, b;
extern int c;
extern float f;

int main(int argc, char **argv){
   
   
    int a, b, c;
    float f;

    a = 10;
    b = 20;
    c = a + b ;
    cout << c << endl;

    f = 70.0/3.0;

    cout << f << endl;

    return 0;
}

Less-3：

#include <iostream>
using namespace std;

int main(int argc, char **argv){
   
   
    unsigned int a = 60; // 60 = 0011 1100
    unsigned int b = 13; // 13 = 0000 1101
    int c = 0;

    c = a << 2;
    cout << "Line 1 - c 的值是" << c << endl;
    c = a >> 2;
    cout << "Line 2 - c 的值是" << c << endl;
    cout << sizeof(c) << endl;
    return 0;
}

Less-4：

#include <iostream>
using namespace std;

int main(int argc, char **argv)
{
   
   
     int a, b, c;
     char ch;
     cin >> a >> ch >> b >> c;
     cout << a << endl
          << ch << endl
          << b << endl
          << c;
     return 0;
}

Less-5：

#include <iostream>
using namespace std;
int main(int argc, char **argv)
{
   
   
    int arr[4] = {
   
   1, 2, 3, 4}, i;
    int *a = arr;
    int