C++ Programming Code Examples
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Locate maximum element in a vector
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/* Locate maximum element in a vector */
#include <iostream>
using std::cout;
using std::endl;
#include <algorithm>
#include <numeric>
#include <vector>
#include <iterator>
int main()
{
std::ostream_iterator< int > output( cout, " " );
int a2[ 10 ] = { 100, 2, 8, 1, 50, 3, 8, 8, 9, 10 };
std::vector< int > v2( a2, a2 + 10 ); // copy of a2
cout << "\n\nVector v2 contains: ";
std::copy( v2.begin(), v2.end(), output );
// locate maximum element in v2
cout << "\nMaximum element in Vector v2 is: "
<< *( std::max_element( v2.begin(), v2.end() ) );
cout << endl;
return 0;
}
/*
Vector v2 contains: 100 2 8 1 50 3 8 8 9 10
Maximum element in Vector v2 is: 100
*/
A program shall contain a global function named main, which is the designated start of the program in hosted environment. main() function is the entry point of any C++ program. It is the point at which execution of program is started. When a C++ program is executed, the execution control goes directly to the main() function. Every C++ program have a main() function.
copy() function is used to copy items from one iterator to another iterator with a specific range. We can define the start and end position of the source and it will copy all items in this rage to a different destination. To use copy() function, we need to include <bits/stdc+.h> or header file. It copies all the elements pointed by first and last. first element is included in the output but last is not. output is the start position of the final result iterator. It returns one iterator to the end of the destination range where elements have been copied. Function returns an iterator to the end of the destination range where elements have been copied.
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Ostream iterators are output iterators that write sequentially to an output stream (such as cout). They are constructed from a basic_ostream object, to which they become associated, so that whenever an assignment operator (=) is used on the ostream_iterator (dereferenced or not) it inserts a new element into the stream. Optionally, a delimiter can be specified on construction. This delimiter is written to the stream after each element is inserted.
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Return largest element in range. Returns an iterator pointing to the element with the largest value in the range [first,last). C++ Algorithm max_element() returns an iterator pointing to the element with the largest value in the range [first, last). If several elements fulfill this condition, the returned iterator points to the first of such elements. The comparisons are performed using either operator< for the first version, or comp for the second; An element is the largest if no other element does not compare less than it. If more than one element fulfills this condition, the iterator returned points to the first of such elements. Function returns an iterator to largest value in the range, or last if the range is empty.
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