Maps in C++ are part of the Standard Template Library (STL). A map is a container that stores data in key-value pairs, where each key is unique.<\/p>\n\n\n\n
A map is a data structure that stores elements in pairs:<\/p>\n\n\n\n
Each key maps to exactly one value.<\/p>\n\n\n\n
Maps are useful because they:<\/p>\n\n\n\n
To use maps in C++, include the You can insert values using the key.<\/p>\n\n\n\n Think of a dictionary:<\/p>\n\n\n\n You search by word to get meaning. This is how a map works.<\/p>\n\n\n\n Maps are used in:<\/p>\n\n\n\n Maps are important because they:<\/p>\n\n\n\n <\/p> <\/div> <\/div>\n\n\n\n Maps in C++ are powerful STL containers that store data in key-value pairs. They provide fast searching, organized storage, and are widely used in real-world applications where efficient data access is required.<\/p>\n\n\n<map><\/code> library.<\/p>\n\n\n\n#include <map><\/code><\/pre>\n\n\n\nDeclaring a Map<\/h1>\n\n\n\n
map<string, int> studentMarks;<\/code><\/pre>\n\n\n\nAdding Elements<\/h1>\n\n\n\n
studentMarks[\"Ali\"] = 85;
studentMarks[\"Ahmed\"] = 90;<\/code><\/pre>\n\n\n\nAccessing Elements<\/h1>\n\n\n\n
cout << studentMarks[\"Ali\"];<\/code><\/pre>\n\n\n\nExample Program of Map<\/h1>\n\n\n\n
#include <iostream>
#include <map>
using namespace std;
int main() {
map<string, int> marks;
marks[\"Ali\"] = 80;
marks[\"Sara\"] = 90;
marks[\"Ahmed\"] = 85;
for (auto it : marks) {
cout << it.first << \" : \" << it.second << endl;
}
return 0;
}<\/code><\/pre>\n\n\n\nOutput<\/h2>\n\n\n\n
Ahmed : 85
Ali : 80
Sara : 90<\/code><\/pre>\n\n\n\nCommon Map Functions<\/h1>\n\n\n\n
Function<\/th> Purpose<\/th><\/tr><\/thead> insert()<\/code><\/td>Add element<\/td><\/tr> erase()<\/code><\/td>Remove element<\/td><\/tr> find()<\/code><\/td>Search key<\/td><\/tr> size()<\/code><\/td>Get number of elements<\/td><\/tr> empty()<\/code><\/td>Check if map is empty<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n Example of insert and find<\/h1>\n\n\n\n
marks.insert({\"Zain\", 75});
if (marks.find(\"Ali\") != marks.end()) {
cout << \"Found\";
}<\/code><\/pre>\n\n\n\nHow Map Works<\/h1>\n\n\n\n
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Types of Maps<\/h1>\n\n\n\n
1. Ordered Map<\/h2>\n\n\n\n
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map<\/code><\/li>\n<\/ul>\n\n\n\n2. Unordered Map<\/h2>\n\n\n\n
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unordered_map<\/code><\/li>\n<\/ul>\n\n\n\nDifference Between Map and Vector<\/h1>\n\n\n\n
Map<\/th> Vector<\/th><\/tr><\/thead> Key-value storage<\/td> Index-based storage<\/td><\/tr> Unique keys<\/td> No key concept<\/td><\/tr> Sorted by key<\/td> Not sorted automatically<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n Important Points About Maps<\/h1>\n\n\n\n
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Advantages of Maps<\/h1>\n\n\n\n
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Common Mistakes with Maps<\/h1>\n\n\n\n
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Real-Life Example<\/h1>\n\n\n\n
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Applications of Maps<\/h1>\n\n\n\n
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Why Maps are Important<\/h1>\n\n\n\n
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Conclusion<\/h2>\n\n\n\n