vector<int>::iterator result = find( L.begin( ), L.end( ), 3 ); //查找3 if ( result == L.end( ) ) //没找到 cout << "No" << endl; else //找到 cout << "Yes" << endl; } 记着要包含algorithm这一头文件,其定义了find这一函数。 资料参考:https://www.coonote.com/cplusplus-note/vector-find.html
vector<int>vec; vec.push_back(123); vec.push_back(456); vector<int>::iterator findit=find(vec.begin(),vec.end(),123); //vector<int>::iterator findit = find(vec.begin(),vec.end(),111); if(findit==vec.end()) { printf("no find\n"); } else { printf("find[%d]\n",*fi...
h:257 0x0804a8d9 in std::string::find (this=0xbfb54a10, __s=0x804b8f2 "2", __pos=4294967295) at /usr/include/c++/4.1.2/bits/basic_string.h:1579 1579 return this->find(__s, __pos, traits_type::length(__s)); Value returned is $1 = 1 (gdb) s std::string::find (...
There’s no universal way of calculating the size of C-style arrays without worrying about many edge cases, and that’s why thestd::vectorclass exists. Usearray.size()Function to Calculate Array Length in C++ In C++, thearray.size()functionallows us to determine the size of an array at...
This is a modal window. No compatible source was found for this media. usingnamespacestd;intmain(){string x=" Tutorialspoint Company ";cout<<"String = "<<x<<endl;cout<<"position = "<<x.find('C');return0;} Output Following is the output of the above code. ...
Breakpoint 4, readFunctionList (functionLists=std::vector of length 0, capacity 0) at foo.cpp:7 7 size_t readFunctionList(vector<string> &functionLists){ (gdb) n 9 size_t noOfFunc = 0; (gdb) 10 ifstream listOfFunctions("FunctionList.txt"); (gdb) 11 if(listOfFunctions){ (gdb) ...
STL_string.vector中find到的iterator的序号 ZC:注意,printf("0x%08X\n",vtr.end()); 打印出来 应该就是 0x00000000,∵ 它就是 指向最后一个元素的后面,应该是理解成 无意义 值是0 很合理。 1、测试代码(以及 我的疑问) /*ZC: 网上查到,使用vector时,只要将 find到的iterator(itX)减去vector::begin()...
// [[Rcpp::export(rng = false)]] Eigen::SparseMatrix<double> ComputeSNN(Eigen::MatrixXd nn_ranked, double prune) { std::vector<T> tripletList; //声明一个向量 int k = nn_ranked.cols(); //总列数 tripletList.reserve(nn_ranked.rows() * nn_ranked.cols()); //定义行列,初始化全0...
cvPOSIT( positObject, &srcImagePoints[0], FOCAL_LENGTH, criteria, rotation_matrix, translation_vector ); 1. 2. 3. 4. 5. 6. 7. 迭代完成之后,cvPOSIT将结果存储在rotation_matrix和translation_vector.下面的截图展示了带有白色圆圈的scrImgePoints,以及一个坐标轴来表明旋转和平移的结果。
// Break the loop as soon as a digit is found in the string}}}returnresult;// Return the vector containing strings with digits}// Main functionintmain(){vector<string>colors={"red","green23","1black","white"};// Initializing a vector of stringscout<<"Original Vector elements:\n";...