#include<vector> using std::vector; //Vector is a container. //It has a collection of same type objects. //****************************************************** //Defining and Initializing vectors vector<int> ivec; //Initially empty //give iv…

In order to use string type, we need to include the following code #include<string> using std::string; 1. Defining and initializing strings string s1; //Default initialization; s1 is the empty string string s2(s1); //s2 is a copy of s1. string s2 =…

vector的定义 vector是C++标准库里最常用的容器,它之所以被称为容器,是因为它可以存放多个对象,所有在用一个容器中的对象都应该具有相同的类型. vector也是一个类模板,这也是它能存放多种类型元素的原因.关于类模板的知识,请参考我的另一篇文章:http://blog.csdn.net/larry233/article/details/50985945 初始化vector vectorv1; // vector that holds objects of type T.Default…

The string type supports variable-length character strings.The library takes cares of managing memory associated with storing the characters and provides various useful operations.The library string type is intended to be efficient enough for general…

1.02-07 15:19:09.277: E/linker(16043): load_library(linker.cpp:759): library "libmaliinstr.so" not found…

关于string的定义,请参阅博文http://blog.csdn.net/larry233/article/details/51483827 string的操作 s.empty() //Returns true if s is empty,otherwise returns false s.size() //Returns numbers of characters of s s[n] //Returns the character at position n in s,positions s…

for (declaration : expression) statement; /* This statement will iterate through the elements in the given expression. expression: an object of a type that represents a sequence declaration: defines the variable that we'll use to access the underlyin…

If we want to use cin in the standard library, we need to std::cin To simplify this work, we can do like this using namespace::name; * Headers should not include using Declarations Why? The reason is that the contents of a header are copied into the…

运行时报错如上图所示,原因是你使用的opencv库是64位的,qt里面使用的编译器MSVC是32位的,解决方法如下: 将构建套件修改位64bit:…

3.1 Namespace using Declarations 1.因为C++里有名字空间的定义,例如我们使用cin的时候必须写成std::cin,如果就用一次还是可以接受的,但是如果一直都这样,那就很麻烦了.所以C++使用了一个姓的关键字using. (1)第一种用法: 例如:using namespace std; 这样子的话就可以使用std名字空间下面所有的方法而不用加std::. (2)第二种用法: 例如:using std::cin; 这样子的就只能cin前面不加std::,而其他的…