c++ vector的用法(整理)（The use of c++ vector (finishing)）.docVIP

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c++ vector的用法(整理)（The use of c++ vector (finishing)）.doc

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cvector的用法(整理)（Theuseofcvector(finishing)）

c++ vector的用法(整理)（The use of c++ vector (finishing)） Vector is a vector type, it can accommodate many types of data, such as the number of integers, so called container. Vector is an important member of the C++ STL, use it when the need to include the header file: #includevector; First, the initialization of vector: there are five ways, for example as follows: (1) vectorint a (10); / / define a vector of 10 integer elements (brackets for the element type, it can be any valid data types), but did not give the initial value, the value is uncertain. (2) vectorint a (10,1); / / define a vector of 10 integer elements, and each element of the initial value is 1 (3) vectorint a (b); / / b vector to create a vector, the overall copy assignment (4) vectorint a (b.begin), b.begin+3 (a); / / define the value of B in zeroth to second (total 3 elements) (5) int b[7]={1,2,3,4,5,9,8}; Vectorint a (B, b+7); / / get the initial value from the array Two, several important vector objects, for example as follows: (1) a.assign (b.begin) (b.begin), (+3); //b vector, vector Fu B 0~2 elements to a (2) a.assign (4,2); / / a contains only 4 elements, and each element is 2 (3) (a.back); / / the last element return a (4) (a.front); / / the first element of the returned a A[i] (5); / / return a the first I elements (6) (a.clear); / / a empty elements (7) (a.empty); / / A to determine whether it is empty, empty returns ture, not empty returns false (8) (a.pop_back); / / delete the last element of the a vector (9) a.erase (a.begin) (+1, a.begin) (+3); / / delete a first (from zeroth to date) second elements, is to remove elements from the a.begin (+1) date (including it) to a.begin (+3) (excluding it) (10) a.push_back (5); / / insert an element at the end of a vector a, its value is 5 (11) a.insert (a.begin) (+1,5); / / in the first elements of a (from zeroth on) the location of the insertion value of 5, such as a 1,2,3,4, 1,5,2,3,4 after inserting elements (12) a.insert (a.begin) (+1,3,5); / / i