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44 lines
1.2 KiB
C++
44 lines
1.2 KiB
C++
/****************************************************************
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****
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**** This file belongs with the course
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**** Introduction to Scientific Programming in C++/Fortran2003
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**** copyright 2016-2021 Victor Eijkhout eijkhout@tacc.utexas.edu
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****
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**** arraystd.cxx : use of std::vector
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****
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****************************************************************/
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#include <iostream>
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using std::cin, std::cout;
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#include <vector>
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using std::vector;
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int main() {
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int array_length;
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cout << "How many elements? ";
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cin >> array_length;
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//examplesnippet stdvector
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vector<double> my_array(array_length);
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//examplesnippet end
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// vector<double> my_array; my_array.reserve(array_length);
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for (int i=0; i<array_length; i++) {
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double user_number;
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cout << "number " << i << "=";
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cin >> user_number;
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//examplesnippet stdvector
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my_array[i] = user_number;
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//examplesnippet end
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}
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#if 0
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//examplesnippet stdvector
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my_array[array_length] = 0.123; // wrong but probably works
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my_array.at(array_length) = 0.123; // runtime error
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cout << "the array has " << my_array.size() << " elements" << '\n';
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//examplesnippet end
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#endif
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return 0;
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}
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