SUMMARY: AddressSanitizer: SEGV /home/qiang/CppTest/vector_test.cpp:7 in func() ==2026418==ABORTING 4. 结论 当对效率要求较高时,使用[]访问元素,但是需要自己做越界检查。 当对效率要求不高时,使用at()访问元素,会做越界检查,如果越界会抛出out_of_range异常。 5. 启示
basically we sort the 1D array in//descending order(the last row)sort(two_D_vector[2].begin(), two_D_vector[2].end(), greater<int>());//print the 2D vectorcout<<"printing the 2D vector after sorting\n";
1. Get element at index = 5 in string vector In the following C++ program, we define a vector of integers, and get the reference to the element at index=5. main.cpp </> Copy #include<iostream>#include<vector>usingnamespacestd;intmain(){vector<int>nums{1,2,4,8,16,32,64};int&x...
SUMMARY: AddressSanitizer: SEGV /home/qiang/CppTest/vector_test.cpp:7 in func() ==2026418==ABORTING 4. 结论 当对效率要求较高时,使用[]访问元素,但是需要自己做越界检查。 当对效率要求不高时,使用at()访问元素,会做越界检查,如果越界会抛出out_of_range异常。 5. 启示 当发生奇怪的coredump时,可以...
// CPP program to illustrate// Application ofat() function#include<iostream>#include<vector>usingnamespacestd;intmain(){vector<int> myvector; myvector.push_back(1); myvector.push_back(2); myvector.push_back(3); myvector.push_back(4); ...
[] 运算符重载 函数二、 vector 容器首尾元素访问...1、vector 容器首尾元素访问函数 2、代码示例 - vector 容器首尾元素访问一、 vector 容器元素访问 1、vector 容器访问指定索引的元素 - at 函数 vector 容器访问指定索引的元素...容器访问指定索引的元素 - [] 运算符重载 函数 vector 容器可以使用 [] ...
());// Sort the elements of the vector in ascending orderintlast=nums.at(0)-1;// Initialize a variable to store the last value, set to one less than the first elementfor(intnumber:nums){if((number-last)!=1)// Check if the current number is not one greater than the last one...
Reference operator [g] : g1[2] = 30 at : g1.at(4) = 50 front() : g1.front() = 10 back() : g1.back() = 100 The first element is 10 修饰符Modifiers: C / C++program to illustrate the // Modifiers in vector #include <bits/stdc++.h> #include <vector> using namespace st...
It can add only one element and only at the end of the vector. So for initializing multiple elements we have to call the push_back method many times. #include #include using namespace std; int main() { vector <int> v; v.push_back(1); v.push_back(2); v.push_back(3); v....
// vector_at.cpp // compile with: /EHsc #include <vector> #include <iostream> int main( ) { using namespace std; vector <int> v1; v1.push_back( 10 ); v1.push_back( 20 ); const int &i = v1.at( 0 ); int &j = v1.at( 1 ); cout << "The first element is " <<...