{"id":146574,"date":"2025-08-08T12:06:05","date_gmt":"2025-08-08T06:36:05","guid":{"rendered":"https:\/\/data-flair.training\/blogs\/?p=146574"},"modified":"2025-08-08T12:06:05","modified_gmt":"2025-08-08T06:36:05","slug":"cpp-function-call-by-reference","status":"publish","type":"post","link":"https:\/\/data-flair.training\/blogs\/cpp-function-call-by-reference\/","title":{"rendered":"C++ Function Call by Reference"},"content":{"rendered":"

Program 1<\/h3>\n
\/\/ Function in CPP\r\n#include<iostream>\r\nusing namespace std;\r\nint swap(int *a,int *b);\r\nint main()\r\n{\r\n     system(\"cls\");\r\n     int a,b;\r\n     cout<<\"Enter two number\";\r\n     cin>>a>>b;\r\n     cout<<\"\\nBefore swaping: \"<<a<<\"  \"<<b;\r\n     swap(&a,&b); \/\/local \r\n     cout<<\"\\nAfter swaping: \"<<a<<\"  \"<<b;\r\n     return 0;\r\n}\r\nint swap(int *a,int *b)  \/\/local\r\n{\r\n    *a=*a+*b;\r\n    *b=*a-*b;\r\n    *a=*a-*b;\r\n}\r\n\r\n\r\n\r\n\/\/void display(int *a); \/\/declare\r\n\/\/ int main()\r\n\/\/ {\r\n\/\/      system(\"cls\");\r\n\/\/      int a=50;     \/\/local\r\n\/\/      display(&a);   \/\/adress as an argument  \/\/\/ call by reference \r\n\/\/      cout<<a;  \/\/a=50\r\n\/\/      return 0;\r\n\/\/ }\r\n\/\/ void display(int *a) \/\/  pointer \r\n\/\/ {\r\n\/\/         ++*a;\r\n\/\/ }<\/pre>\n
Program 2<\/h3>\n
\/\/ Function in CPP\r\n#include<iostream>\r\nusing namespace std;\r\n int a=50;   \/\/global\r\n\/\/void first();\r\nvoid display();\r\nint main()\r\n{\r\n    \/\/ int a =10;  \/\/local\r\n     system(\"cls\");\r\n    \/\/ cout<<a;  \/\/10\r\n    \/\/ first();\r\n    \/\/ cout<<endl<<a;  \/\/10\r\n    display();\r\n     return 0;\r\n\r\n}\r\nvoid display()\r\n{\r\n    cout<<\"\\nHello\";\r\n    cout<<\"\\nDataFlair\";\r\n    return;\r\n    cout<<\"\\nIndore\";\r\n}\r\n\/\/ void first()\r\n\/\/ {\r\n\/\/     a=a+10;\r\n\/\/     cout<<\"\\n with in first: \"<<a;\r\n\/\/ }<\/pre>\n","protected":false},"excerpt":{"rendered":"
Program 1 \/\/ Function in CPP #include<iostream> using namespace std; int swap(int *a,int *b); int main() { system(“cls”); int a,b; cout<<“Enter two number”; cin>>a>>b; cout<<“\\nBefore swaping: “<<a<<” “<<b; swap(&a,&b); \/\/local cout<<“\\nAfter swaping: “<<a<<” “<<b;...<\/p>\n","protected":false},"author":581,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[20172],"tags":[29558,28585,2263,35044,29219,29218,31111,29557],"class_list":["post-146574","post","type-post","status-publish","format-standard","hentry","category-cpp","tag-c-call-by-reference","tag-c-tutorial","tag-c","tag-c-function-call-by-reference","tag-c-practical","tag-c-program","tag-call-by-reference","tag-call-by-reference-in-c"],"yoast_head":"\nC++ Function Call by Reference - 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\/cpp-function-call-by-reference\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"C++ Function Call by Reference - DataFlair\" \/>\n<meta property=\"og:description\" content=\"Program 1 \/\/ Function in CPP #include<iostream> using namespace std; int swap(int *a,int *b); int main() { system("cls"); int a,b; cout<<"Enter two number"; cin>>a>>b; cout<<"nBefore swaping: "<<a<<" "<<b; swap(&a,&b); \/\/local cout<<"nAfter swaping: "<<a<<" "<<b;...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/data-flair.training\/blogs\/cpp-function-call-by-reference\/\" \/>\n<meta property=\"og:site_name\" content=\"DataFlair\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/DataFlairWS\/\" \/>\n<meta property=\"article:published_time\" content=\"2025-08-08T06:36:05+00:00\" \/>\n<meta name=\"author\" content=\"DataFlair Team\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@DataFlairWS\" \/>\n<meta name=\"twitter:site\" content=\"@DataFlairWS\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"DataFlair Team\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"C++ Function Call by Reference - DataFlair","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/data-flair.training\/blogs\/cpp-function-call-by-reference\/","og_locale":"en_US","og_type":"article","og_title":"C++ Function Call by Reference - DataFlair","og_description":"Program 1 \/\/ Function in CPP #include<iostream> using namespace std; 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