{"id":4938,"date":"2022-10-06T10:21:12","date_gmt":"2022-10-06T10:21:12","guid":{"rendered":"https:\/\/www.wikitechy.com\/interview-questions\/?p=4938"},"modified":"2022-10-06T10:21:12","modified_gmt":"2022-10-06T10:21:12","slug":"what-are-called-and-calling-functions","status":"publish","type":"post","link":"https:\/\/www.wikitechy.com\/interview-questions\/c\/what-are-called-and-calling-functions\/","title":{"rendered":"What are called and calling functions ?"},"content":{"rendered":"<ul>\n<li style=\"text-align: justify;\">A function call is very important in programming.<\/li>\n<li style=\"text-align: justify;\">When we need to call a function, it is called inside a program.<\/li>\n<li style=\"text-align: justify;\">A function which is being called by the parent functions is known as called functions<\/li>\n<li style=\"text-align: justify;\">Function which is being called is known as calling function.<\/li>\n<li style=\"text-align: justify;\">A function is called by the program whenever it is needed.<\/li>\n<li style=\"text-align: justify;\">Functions are called by its name in the main program.<\/li>\n<li style=\"text-align: justify;\">We can pass parameters to the functions that are being called in the main function.<\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone size-full wp-image-4942 aligncenter\" src=\"https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/10\/what-are-called-and-calling-function.jpg\" alt=\"\" width=\"796\" height=\"402\" srcset=\"https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/10\/what-are-called-and-calling-function.jpg 796w, https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/10\/what-are-called-and-calling-function-300x152.jpg 300w, https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/10\/what-are-called-and-calling-function-768x388.jpg 768w, https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/10\/what-are-called-and-calling-function-390x197.jpg 390w\" sizes=\"(max-width: 796px) 100vw, 796px\" \/><\/p>\n<h2 id=\"syntax\" style=\"text-align: justify;\"><strong>Syntax<\/strong><\/h2>\n<div class=\"code-embed-wrapper\"> <div class=\"code-embed-infos\"> <\/div> <pre class=\"language-c code-embed-pre line-numbers\"  data-start=\"1\" data-line-offset=\"0\"><code class=\"language-c code-embed-code\">Add(a, b) \/\/ a and b are the parameters <\/code><\/pre> <\/div>\n<h3 id=\"calling-a-function-in-c-program\" style=\"text-align: justify;\">Calling a function in C program<\/h3>\n<h3 id=\"add-c\" style=\"text-align: justify;\"><strong>Add.c<\/strong><\/h3>\n<div class=\"code-embed-wrapper\"> <div class=\"code-embed-infos\"> <\/div> <pre class=\"language-c code-embed-pre line-numbers\"  data-start=\"1\" data-line-offset=\"0\"><code class=\"language-c code-embed-code\">#include <stdio.h>  <br\/>int add(int a, int b);   <br\/>void main()  <br\/>{  <br\/>  <br\/>int sum;  <br\/>int a, b;  <br\/>printf(&quot; Enter the first and second number \\n&quot;);  <br\/>scanf(&quot;%d %d&quot;, &a, &b);  <br\/>sum = add(a, b); \/\/ call add() function  <br\/>printf( &quot;The sum of the two number is %d&quot;, sum);  <br\/>}  <br\/>int add(int n1, int n2) \/\/ pass n1 and n2 parameter  <br\/>{  <br\/>int c;  <br\/>c = n1 + n2;  <br\/>return c;  <br\/>}  <\/code><\/pre> <\/div>\n<h3 id=\"output\" style=\"text-align: justify;\">Output<\/h3>\n<p style=\"text-align: justify;\"><img decoding=\"async\" class=\"alignnone size-full wp-image-4939 aligncenter\" src=\"https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/10\/calling-function-c.jpg\" alt=\"\" width=\"299\" height=\"141\" \/><\/p>\n<h2 id=\"call-by-value\" style=\"text-align: justify;\"><strong>Call by value<\/strong><\/h2>\n<ul style=\"text-align: justify;\">\n<li>When an single or multiple values of an argument are copied into formal parameters of a function, this type of functions is known as Call By Value.<\/li>\n<li>It does not change the value of the function`s actual parameter.<\/li>\n<\/ul>\n<h3 id=\"call-by-value-in-c-programming\" style=\"text-align: justify;\">Call by Value in C programming<\/h3>\n<h3 id=\"call_value-c\" style=\"text-align: justify;\"><strong>Call_Value.c<\/strong><\/h3>\n<div class=\"code-embed-wrapper\"> <div class=\"code-embed-infos\"> <\/div> <pre class=\"language-c code-embed-pre line-numbers\"  data-start=\"1\" data-line-offset=\"0\"><code class=\"language-c code-embed-code\">#include <stdio.h>  <br\/>int main()  <br\/>{  <br\/>int x = 10, y = 20;  <br\/>printf (&quot; x = %d, y = %d from main before calling the function&quot;, x, y);  <br\/>CallValue(x, y);  <br\/>printf( &quot;\\n x = %d, y = %d from main after calling the function&quot;, x, y);  <br\/>}  <br\/>int CallValue( int x, int y)  <br\/>{  <br\/>x = x + 5;  <br\/>y = y + 5;  <br\/>printf (&quot; \\nx = %d, y = %d from modular function&quot;, x, y);  <br\/>}   <\/code><\/pre> <\/div>\n<h3 id=\"output-2\" style=\"text-align: justify;\">Output<\/h3>\n<p style=\"text-align: justify;\"><img decoding=\"async\" class=\"alignnone size-full wp-image-4940 aligncenter\" src=\"https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/10\/call-by-value-in-c-programming.jpg\" alt=\"\" width=\"476\" height=\"119\" srcset=\"https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/10\/call-by-value-in-c-programming.jpg 476w, https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/10\/call-by-value-in-c-programming-300x75.jpg 300w, https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/10\/call-by-value-in-c-programming-390x98.jpg 390w\" sizes=\"(max-width: 476px) 100vw, 476px\" \/><\/p>\n<h2 id=\"call-by-reference\" style=\"text-align: justify;\"><strong>Call By Reference<\/strong><\/h2>\n<ul style=\"text-align: justify;\">\n<li>As name suggests call by reference is a method, where the address of the actual argument is copied into the function call\u2019s formal parameter.<\/li>\n<li>This type of method is known as\u00a0Call by Reference.<\/li>\n<li>If we make some changes in the formal parameters, it shows the effect in the value of the actual parameter.<\/li>\n<\/ul>\n<h3 id=\"call-by-reference-in-c-programming\" style=\"text-align: justify;\">Call by Reference in C programming<\/h3>\n<h3 id=\"call_ref-c\" style=\"text-align: justify;\"><strong>Call_Ref.c<\/strong><\/h3>\n<div class=\"code-embed-wrapper\"> <div class=\"code-embed-infos\"> <\/div> <pre class=\"language-c code-embed-pre line-numbers\"  data-start=\"1\" data-line-offset=\"0\"><code class=\"language-c code-embed-code\">#include <stdio.h>  <br\/>int main()  <br\/>{  <br\/>int x = 10, y = 20;  <br\/>printf (&quot; x = %d, y = %d from main before calling the function&quot;, x, y);  <br\/>CallValue (&x, &y);  <br\/>printf( &quot;\\n x = %d, y = %d from main after calling the function&quot;, x, y);  <br\/>}  <br\/>int CallRef( int *a, int *b)  <br\/>{  <br\/>*a = *a + 5;  <br\/>*b = *b + 5;  <br\/>printf (&quot; \\nx = %d, y = %d from modular function&quot;, *a, *b);  <br\/>}  <\/code><\/pre> <\/div>\n<h3 id=\"output-3\" style=\"text-align: justify;\">Output<\/h3>\n<p style=\"text-align: justify;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-4941 aligncenter\" src=\"https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/10\/call-by-reference-in-c.jpg\" alt=\"\" width=\"474\" height=\"116\" srcset=\"https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/10\/call-by-reference-in-c.jpg 474w, https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/10\/call-by-reference-in-c-300x73.jpg 300w, https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/10\/call-by-reference-in-c-390x95.jpg 390w\" sizes=\"(max-width: 474px) 100vw, 474px\" \/><\/p>\n<p style=\"text-align: justify;\">\n","protected":false},"excerpt":{"rendered":"<p>A function call is very important in programming. When we need to call a function, it is called inside a program. A function which is being called by the parent functions is known as called functions Function which is being called is known as calling function. A function is called by the program whenever it [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1716],"tags":[18716,18818,18822,18815,2076,18817,2062,18813,18821,18823,18819,18816,18820,18814],"class_list":["post-4938","post","type-post","status-publish","format-standard","hentry","category-c","tag-c-functions","tag-c-user-defined-functions","tag-called-function-and-calling-function","tag-calling-a-functio-in-c-programming","tag-function-in-c-programming-examples","tag-types-of-function-calls-in-c","tag-types-of-functions-in-c","tag-what-is-a-called-function-and-calling-function-in-c","tag-what-is-called-function","tag-what-is-called-function-and-calling-function-in-c","tag-what-is-calling-function-in-c","tag-what-is-function-call-in-c","tag-what-is-function-in-c","tag-what-is-the-function-call-in-c"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What are called and calling functions ? - What is Function Call in C<\/title>\n<meta name=\"description\" content=\"What are called and calling functions ? - A function call is very important in programming. 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