Associative array/Creation: Difference between revisions
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In this task, the goal is to create an [[associative array]]. |
In this task, the goal is to create an [[associative array]]. |
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==[[C plus plus|C++]]== |
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'''Compiler:''' g++ 4.0.2 |
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#include <map> |
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#include <string> |
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#include <iostream> |
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#include <ostream> |
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int main() |
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{ |
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// This is an associative array which maps strings to ints |
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typedef std::map<std::string, int> colormap_t; |
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colormap_t colormap; |
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// First, populate it with some values |
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colormap["red"] = 0xff0000; |
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colormap["green"] = 0x00ff00; |
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colormap["blue"] = 0x0000ff; |
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colormap["my favourite color"] = 0x00ffff; |
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// then, get some values out |
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int color = colormap["green"]; // color gets 0x00ff00 |
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color = colormap["black"]; // accessing unassigned values assigns them to 0 |
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// get some value out without accidentally inserting new ones |
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colormap_t::iterator i = colormap.find("green"); |
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if (i == colormap.end()) |
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{ |
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std::cerr << "color not found!\n"; |
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} |
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else |
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{ |
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color = i->second; |
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} |
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// Now I changed my mind about my favourite color, so change it |
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colormap["my favourite color"] = 0x337733; |
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// print out all defined colors |
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for (colormap_t::iterator i = colormap.begin(); i != colormap.end(); ++i) |
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std::cerr << "colormap[\"" << i->first << "\"] = 0x" << std::hex << i->second << "\n"; |
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} |
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==[[Perl]]== |
==[[Perl]]== |