GATE2013 q42 - Revision history

Arjun Suresh at 12:02, 15 July 2014

2014-07-15T12:02:17Z

Arjun Suresh at 07:17, 15 April 2014

2014-04-15T07:17:35Z

Arjun Suresh at 07:16, 15 April 2014

2014-04-15T07:16:26Z

Arjun Suresh at 19:07, 5 February 2014

2014-02-05T19:07:07Z

Arjun Suresh at 19:06, 5 February 2014

2014-02-05T19:06:16Z

Arjun Suresh at 19:05, 5 February 2014

2014-02-05T19:05:17Z

Arjun Suresh at 19:05, 5 February 2014

2014-02-05T19:05:05Z

Arjun Suresh at 19:04, 5 February 2014

2014-02-05T19:04:45Z

Arjun Suresh: Created page with "Q.42 What is the return value of f(p,p), if the value of p is initialized to 5 before the call? Note that the first parameter is passed by reference, whereas the second param..."

2014-02-05T18:58:09Z

Created page with "Q.42 What is the return value of f(p,p), if the value of p is initialized to 5 before the call? Note that the first parameter is passed by reference, whereas the second param..."

New page

Q.42 What is the return value of f(p,p), if the value of p is initialized to 5 before the call? Note that
the first parameter is passed by reference, whereas the second parameter is passed by value.

int f (int &x, int c) {
c = c - 1;
if (c==0) return 1;
x = x + 1;
return f(x,c) * x;
}

(A) 3024

'''(B) 6561'''

(C) 55440

(D) 161051

===Solution===

@@ Line 31: / Line 31: @@
 [[Category: GATE2013]]
-[[Category: Programming Languages questions]]
+[[Category: Programming Languages questions from GATE]]
 [[Category:Coding Questions]]

@@ Line 31: / Line 31: @@
 [[Category: GATE2013]]
-[[Category: C questions]]
+[[Category: Programming Languages questions]]
 [[Category:Coding Questions]]

@@ Line 31: / Line 31: @@
 [[Category: GATE2013]]
-[[Category: Previous year GATE questions]]
+[[Category: C questions]]
 [[Category:Coding Questions]]

@@ Line 19: / Line 19: @@
 ===Solution===
-In GATE 2013 marks were given to all as the same code in C/C++ produces undefined behavior. This is because * is not a sequence point. The correct code must replace
+In GATE 2013 marks were given to all as the same code in C/C++ produces undefined behavior. This is because * is not a sequence point in C/C++. The correct code must replace
   return f(x,c) * x;
 with

@@ Line 25: / Line 25: @@
   return res * x;
-In this code, there will be 4 recursive calls with parameters (6,4), (7,3), (8,2) and (9,1). The last call returns 1. But, because of pass by reference, in all the previous functions, x is now 9. Hence, the value returned by f(p,p) will be 9 * 9 * 9 * 9 * 1 = 6561.
+In this code, there will be 4 recursive calls with parameters (6,4), (7,3), (8,2) and (9,1). The last call returns 1. But due to pass by reference, x in all the previous functions is now 9. Hence, the value returned by f(p,p) will be 9 * 9 * 9 * 9 * 1 = 6561.
 {{Template:FBD}}

@@ Line 9: / Line 9: @@
+}
 </syntaxhighlight >
 (A) 3024

@@ Line 1: / Line 1: @@
-Q.42 What is the return value of f(p,p), if the value of p is initialized to 5 before the call? Note that
+What is the return value of f(p,p), if the value of p is initialized to 5 before the call? Note that the first parameter is passed by reference, whereas the second parameter is passed by value.
 the first parameter is passed by reference, whereas the second parameter is passed by value.
   <syntaxhighlight lang="c">
 int f (int &x, int c) {