這本書的複利效應,不單單指的是用在投資上,是人生的一種態度,總覺得有點像原子習慣這本書的意義
紀錄書中喜歡的片段
一個寫程式的宅宅工程師,自以為發一些程式或雜七雜八的廢文就可以衝流量賺錢
自C ++ 11起,在C ++中添加了基於ange的for循環。它在一定範圍內執行for循環。 用作與傳統for循環等效的可讀性更高的for循環,可在一定範圍的值上運行,例如容器中的所有元素。
// range-based-for.cpp
// compile by using: cl /EHsc /nologo /W4
#include <iostream>
#include <vector>
using namespace std;
int main()
{
// Basic 10-element integer array.
int x[10] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
// Range-based for loop to iterate through the array.
for( int y : x ) { // Access by value using a copy declared as a specific type.
// Not preferred.
cout << y << " ";
}
cout << endl;
// The auto keyword causes type inference to be used. Preferred.
for( auto y : x ) { // Copy of 'x', almost always undesirable
cout << y << " ";
}
cout << endl;
for( auto &y : x ) { // Type inference by reference.
// Observes and/or modifies in-place. Preferred when modify is needed.
cout << y << " ";
}
cout << endl;
for( const auto &y : x ) { // Type inference by const reference.
// Observes in-place. Preferred when no modify is needed.
cout << y << " ";
}
cout << endl;
cout << "end of integer array test" << endl;
cout << endl;
// Create a vector object that contains 10 elements.
vector<double> v;
for (int i = 0; i < 10; ++i) {
v.push_back(i + 0.14159);
}
// Range-based for loop to iterate through the vector, observing in-place.
for( const auto &j : v ) {
cout << j << " ";
}
cout << endl;
cout << "end of vector test" << endl;
}
來源:https://docs.microsoft.com/zh-tw/cpp/cpp/range-based-for-statement-cpp?view=vs-2019