functions




1).
The keyword used to transfer control from a function back to the calling function is
A   switch   
B   goto   
C   go back   
D   return   
ANS: D - return

The keyword return is used to transfer control from a function back to the calling function. Example:


#include<stdio.h>
int add(int, int); /* Function prototype */

int main()
{
    int a = 4, b = 3, c;
    c = add(a, b);
    printf("c = %d\n", c);
    return 0;
}
int add(int a, int b)
{
/* returns the value and control back to main() function */
   return (a+b);
}
Output:
c = 7

2).
What is the notation for following functions?
1.  int f(int a, float b)
    {
        /* Some code */
    }

2.  int f(a, b)
    int a; float b;
    {
        /* Some code */
    }
A   1. KR Notation
2. ANSI Notation
  
B   1. Pre ANSI C Notation
2. KR Notation
  
C   1. ANSI Notation
2. KR Notation
  
D   1. ANSI Notation
2. Pre ANSI Notation
  
ANS: C - 1. ANSI Notation
2. KR Notation

KR Notation means Kernighan and Ritche Notation.

3).
How many times the program will print "IndiaBIX" ?
#include<stdio.h>

int main()
{
    printf("aptitudecrack.com");
    main();
    return 0;
}
A   Infinite times   
B   32767 times   
C   65535 times   
D   Till stack overflows   
ANS: D - Till stack overflows

call stack or function stack is used for several related purposes, but the main reason for having one is to keep track of the point to which each active subroutine should return control when it finishes executing. A stack overflow occurs when too much memory is used on the call stack. Here function main() is called repeatedly and its return address is stored in the stack. After stack memory is full. It shows stack overflow error.