{"id":146080,"date":"2025-07-23T12:19:49","date_gmt":"2025-07-23T06:49:49","guid":{"rendered":"https:\/\/data-flair.training\/blogs\/?p=146080"},"modified":"2025-07-23T12:19:49","modified_gmt":"2025-07-23T06:49:49","slug":"social-media-friend-recommendation-system-in-dsa-cpp","status":"publish","type":"post","link":"https:\/\/data-flair.training\/blogs\/social-media-friend-recommendation-system-in-dsa-cpp\/","title":{"rendered":"DSA C++ Project &#8211; Social Media Friend Recommendation System"},"content":{"rendered":"<h3>Program 1<\/h3>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">\/\/Friend Recommendation System in Social Media using graphs \r\n\r\n\/\/System that recommends new friends to users in a social network by analyzing their mutual friends \r\n\/* Features\r\n  1. Add user \r\n  2. Create Friendship \r\n  3. Display Friendship on Social Network\r\n   4. Friend Recommendation\r\n*\/\r\n\r\n\r\n#include &lt;iostream&gt;\r\n#include &lt;cstring&gt;\r\nusing namespace std;\r\n\r\nconst int MAX_USERS = 30;   \/\/ Max user size\r\n\r\nclass SocialGraph \r\n{\r\n    string users[MAX_USERS];\r\n    int adjMatrix[MAX_USERS][MAX_USERS]; \r\n    int userCount;\r\n\r\npublic:\r\n    SocialGraph()  \/\/constructor \r\n    {\r\n        userCount = 0;\r\n        for (int i = 0; i &lt; MAX_USERS; i++)\r\n            for (int j = 0; j &lt; MAX_USERS; j++)\r\n                adjMatrix[i][j] = 0;\r\n    }\r\n\r\n    int findUserIndex(string name) \r\n  {\r\n        for (int i = 0; i &lt; userCount; i++) \r\n        {\r\n            if (users[i] == name)\r\n                return i;\r\n        }\r\n        return -1;\r\n   }\r\n\r\n    void addUser(string name)    \r\n     {\r\n        if (userCount &gt;= MAX_USERS) \r\n        {\r\n            cout &lt;&lt; \" Maximum users reached!\" &lt;&lt; endl;\r\n            return;\r\n        }\r\n        if (findUserIndex(name) != -1) \r\n        {\r\n            cout &lt;&lt; \" User already exists!\" &lt;&lt; endl;\r\n            return;\r\n        }\r\n        users[userCount] = name;\r\n        userCount++;\r\n        cout &lt;&lt; \" User added: \" &lt;&lt; name &lt;&lt; endl;\r\n    }\r\n\r\n    void addFriendship(string u1, string u2)   \/\/ dipesh rajesh\r\n    {\r\n        int idx1 = findUserIndex(u1);   \/\/dipesh    1     \r\n        int idx2 = findUserIndex(u2);  \/\/ rajesh     2 \r\n\r\n        if (idx1 == -1 || idx2 == -1) \r\n        {\r\n            cout &lt;&lt; \" One or both users not found!\" &lt;&lt; endl;\r\n            return;\r\n        }\r\n\r\n        adjMatrix[idx1][idx2] = 1;\r\n        adjMatrix[idx2][idx1] = 1;\r\n        cout &lt;&lt; \" Friendship created between \" &lt;&lt; u1 &lt;&lt; \" and \" &lt;&lt; u2 &lt;&lt; endl;\r\n    }\r\n\r\n    void displayNetwork()\r\n    {\r\n        cout &lt;&lt; \"\\n Social Network:\" &lt;&lt; endl;\r\n        for (int i = 0; i &lt; userCount; i++)    \/\/row\r\n         {\r\n            cout &lt;&lt; users[i] &lt;&lt; \" --&gt; \";\r\n            for (int j = 0; j &lt; userCount; j++)   \/\/column\r\n            {\r\n                if (adjMatrix[i][j]==1)\r\n                    cout &lt;&lt; users[j] &lt;&lt; \" \";\r\n            }\r\n            cout &lt;&lt; endl;\r\n        }\r\n    }\r\n\r\n    void recommendFriends(string name)    \/\/ vivek \r\n    {\r\n        int index = findUserIndex(name);  \/\/ vivek 0\r\n        if (index == -1) \r\n        {\r\n            cout &lt;&lt; \" User not found!\" &lt;&lt; endl;\r\n            return;\r\n        }\r\n\r\n        int recommended[MAX_USERS] = {0};    \r\n\r\n        for (int i = 0; i &lt; userCount; i++)    \/\/ i=1\r\n        {\r\n            if (adjMatrix[index][i]==1)   \/\/[0][1]\r\n            { \r\n                for (int j = 0; j &lt; userCount; j++) \/\/ j=2\r\n                {\r\n                    if (adjMatrix[i][j]==1 &amp;&amp; j != index &amp;&amp; adjMatrix[index][j] == 0) \r\n                    {\r\n                        recommended[j]++;\r\n                    }\r\n                }\r\n            }\r\n        }\r\n\r\n        cout &lt;&lt; \"\\nFriend Recommendations for \" &lt;&lt; name &lt;&lt; \":\" &lt;&lt; endl;\r\n        bool found = false;\r\n        for (int i = 0; i &lt; userCount; i++) \r\n        {\r\n            if (recommended[i] &gt; 0) \r\n            {\r\n                cout &lt;&lt; \"- \" &lt;&lt; users[i] &lt;&lt; \" (Mutual friends: \" &lt;&lt; recommended[i] &lt;&lt; \")\" &lt;&lt; endl;\r\n                found = true;\r\n            }\r\n        }\r\n\r\n        if (found==false)\r\n            cout &lt;&lt; \"No recommendations available.\" &lt;&lt; endl;\r\n    }\r\n};\r\n\r\n\/\/ --------------MAIN FUNCTION---------------\r\nint main() \r\n{\r\n    SocialGraph sg;\r\n    int choice;\r\n    string u1, u2;\r\n\r\n    do \r\n    {\r\n        cout &lt;&lt; \"\\n------------Friend Recommendation System ------------\" &lt;&lt; endl;\r\n        cout &lt;&lt; \"1. Add User\\n2. Add Friendship\\n3. Show Network\\n4. Recommend Friends\\n5. Exit\" &lt;&lt; endl;\r\n        cout&lt;&lt;\"\\n----------------------------------------------------\";\r\n        cout &lt;&lt; \"\\nEnter your choice: \";\r\n        cin &gt;&gt; choice;\r\n        cin.ignore(); \r\n\r\n        switch (choice) \r\n        {\r\n            case 1:\r\n                cout &lt;&lt; \"Enter user name: \";\r\n                getline(cin, u1);\r\n                sg.addUser(u1);   \r\n                break;\r\n            case 2:\r\n                cout &lt;&lt; \"Enter first user name: \";\r\n                getline(cin, u1);\r\n                cout &lt;&lt; \"Enter second user name: \";\r\n                getline(cin, u2);\r\n                sg.addFriendship(u1, u2); \r\n                break;\r\n            case 3:\r\n                sg.displayNetwork();\r\n                break;\r\n            case 4:\r\n                cout &lt;&lt; \"Enter user name to get recommendations: \";\r\n                getline(cin, u1);\r\n                sg.recommendFriends(u1);\r\n                break;\r\n            case 5:\r\n                cout &lt;&lt; \" Exiting. Thank you!\" &lt;&lt; endl;\r\n                break;\r\n            default:\r\n                cout &lt;&lt; \" Invalid choice. Try again.\" &lt;&lt; endl;\r\n        }\r\n    } while (choice != 5);\r\n\r\n    return 0;\r\n}<\/pre>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Program 1 \/\/Friend Recommendation System in Social Media using graphs \/\/System that recommends new friends to users in a social network by analyzing their mutual friends \/* Features 1. Add user 2. Create Friendship&#46;&#46;&#46;<\/p>\n","protected":false},"author":581,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[31449],"tags":[32874,32869,32870,34887,34960,34958,34959,34961],"class_list":["post-146080","post","type-post","status-publish","format-standard","hentry","category-dsa-cpp-tutorials","tag-dsa-c","tag-dsa-c-practical","tag-dsa-c-program","tag-dsa-c-project","tag-dsa-c-social-media-friend-recommendation-system-project","tag-social-media-friend-recommendation-system","tag-social-media-friend-recommendation-system-in-dsa-c","tag-social-media-friend-recommendation-system-project"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>DSA C++ Project - Social Media Friend Recommendation System - DataFlair<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/data-flair.training\/blogs\/social-media-friend-recommendation-system-in-dsa-cpp\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"DSA C++ Project - Social Media Friend Recommendation System - DataFlair\" \/>\n<meta property=\"og:description\" content=\"Program 1 \/\/Friend Recommendation System in Social Media using graphs \/\/System that recommends new friends to users in a social network by analyzing their mutual friends \/* Features 1. 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