InterviewUp – Job Interview Questions and Answers – What is the difference between NULL and NUL in C ?

December 02, 2008

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What is the difference between NULL and NUL in C ?

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Asked By: Anonymous

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NULL is a macro defined in for the null pointer.
NUL is the name of the first character in the ASCII character set. It corresponds to a zero value. There's no standard macro NUL in C, but some people like to define it.
NULL is defined as ( void *)0

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value, null, zero, C, macro, NUL, null pointer, ASCII

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How do you execute a UNIX command in the background?

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Asked By: thunderd |

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To run the count program, which will display the process identification number of the job, enter: count &

To check the status of your job, enter: ps

To bring a background process to the foreground, enter: fg

If you have more than one job suspended in the background, enter: fg %#

Replace # with the job number, as shown in the first column of the output of the jobs command.

You can kill a background process by entering: kill PID

Replace PID with the process ID of the job. If that fails, enter the following:

kill -KILL PID

To determine a job's PID, enter: jobs -l

If you are using sh, ksh, bash, or zsh, you may prevent background processes from sending error messages to the terminal. Redirect the output to /dev/null using the following syntax: count 2> /dev/null &

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Sunday, May 11, 2008

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Bluetooth

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Network Administrator

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134

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when do you use a function pointer as opposed to function call ?

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Asked By: Anonymous |

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you use function ptr when you want to call multiple functions using the ptr in a loop.
like have an array of funtion ptrs, loop through the array and execute the functions.

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Monday, January 21, 2008

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108

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How is structure passing and returning implemented?

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Asked By: tarun |

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structures can be passed by reference.

they can be returned as pointers.

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Saturday, March 15, 2008

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structure, C, passing, returning

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What is pseudo code ?

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Asked By: tarun |

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pseudo code is the code written when converting the algorithm/ flow chart to actual code.
So it is in between the compiled code and flow chart. It is something that is not compiled but can be on
a notepad.

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Saturday, March 15, 2008

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C, pseudo

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what is the difference between method and function ?

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Asked By: anujtripathi |

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Methods are for objects functions are regular routines

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Thursday, October 16, 2008

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C, include, C++

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write a program to show no is prime or not

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Asked By: anujtripathi |

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Test s for prime or not?

#include<stdio.h>
void main(void)
{
           int no,rem,cnt;
        Printf("enter No");
        scanf("%d",&no);
        cnt=2;
        while(cnt<=no)
       {

              rem=no % cnt;
              if (rem==0)
              {
              printf("No is not prime");
              exit(0);
              }
              cnt++;
        }
          printf("No is Prime");
}

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Thursday, October 16, 2008

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prime or not, c

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