.NET C C++ CSS DBA General HTML Java JavaScript JSP JUnit MySQL Networking Oracle Perl Perl PHP PL/SQL RSS Software QA SQL Server Struts Unix Windows XHTML XML

<< < 1 2 3 4 5 6 7 8 9 10 11 … > >>   Sort: Date

What Is Posting
What Is Posting? Posting is an event that writes Inserts, Updates and Deletes in the forms to the database but not committing these transactions to the database. 2007-04-15, 6564👍, 0💬

Order of Exception Catch Clauses
Does it matter in what order catch statements for FileNotFoundException and IOExceptipon are written? Yes, it does. The FileNoFoundException is inherited from the IOException. Exception's subclasses have to be caught first. 2007-03-03, 6561👍, 0💬

"volatile" Modifier
when should the volatile modifier be used? The volatile modifier is a directive to the compiler's optimizer that operations involving this variable should not be optimized in certain ways. There are two special cases in which use of the volatile modifier is desirable. The first case involves memory-... 2007-02-26, 6554👍, 0💬

What is page thrashing
What is page thrashing? Some operating systems (such as UNIX or Windows in enhanced mode) use virtual memory. Virtual memory is a technique for making a machine behave as if it had more memory than it really has, by using disk space to simulate RAM (random-access memory). In the 80386 and higher Int... 2007-02-26, 6550👍, 0💬

Function Calls
What will be printed as the resultof the operation below: int x; int modifyvalue() { return(x+=10); } int changevalue(int x) { return(x+=1); } void main() { int x=10; x++; changevalue(x); x++; modifyvalue(); printf("First output:%d\n",x); x++; changevalue(x); printf("Second output:%d\n",x); modifyva... 2007-02-26, 6546👍, 0💬

How to make elements invisible?
How to make elements invisible? Change the "visibility" attribute of the style object associated with your element. Remember that a hidden element still takes up space, use "display" to make the space disappear as well. if ( x == y) { myElement.style.visibility = 'visible'; } else { myElement.style.... 2009-02-03, 6543👍, 0💬

Function Calls
What will be printed as the result of the operation below: #define swap(a,b) a=a+b;b=a-b;a=a-b; void main() { int x=5, y=10; swap (x,y); printf("%d %d\n",x,y); swap2(x,y); printf("%d %d\n",x,y); } int swap2(int a, int b) { int temp; temp=a; b=a; a=temp; return 0; } The correct answer is 10, 5 5, 10 2007-02-26, 6538👍, 0💬

urlencode() and urldecode() Functions?
What are urlencode() and urldecode() functions in PHP? string urlencode(str) - Returns the URL encoded version of the input string. String values to be used in URL query string need to be URL encoded. In the URL encoded version: Alphanumeric characters are maintained as is. Space characters are conv... 2007-02-27, 6533👍, 0💬

Example of using Regular Expressions for syntax checking in JavaScript
Example of using Regular Expressions for syntax checking in JavaScript ... var re = new RegExp("^(&[A-Za-z_0-9]{1, }=[A-Za-z_0-9]{1,})*$");var text = myWidget.value; var OK = re.test(text); if( ! OK ) { alert("The extra parameters need some work.\r\n Should be something like: \"&a=1&c=4\... 2008-05-13, 6532👍, 0💬

What Is the Quickest Sorting Method?
What is the quickest sorting method to use? The answer depends on what you mean by quickest. For most sorting problems, it just doesn't matter how quick the sort is because it is done infrequently or other operations take significantly more time anyway. Even in cases in which sorting speed is of the... 2007-02-26, 6526👍, 0💬

wait(), notify() and notifyAll() Methods
What is the purpose of the wait(), notify(), and notifyAll() methods? The wait(),notify(), and notifyAll() methods are used to provide an efficient way for threads to communicate each other. 2007-03-03, 6515👍, 0💬

Conditional Statements
What will be printed as the result of the operation below: main() { int a=0; if (a==0) printf("Cisco Systems\n"); printf("Cisco Systems\n"); } Answer: Two lines with "Cisco Systems" will be printed. 2007-02-26, 6511👍, 0💬

Strings vs. Character Arrays
What is the difference between strings and character arrays? A major difference is: string will have static storage duration, whereas as a character array will not, unless it is explicity specified by using the static keyword. Actually, a string is a character array with following properties: * the ... 2007-02-26, 6509👍, 0💬

Using Pointers
What print out will the folloging code produce? main() { char *p1=“name”; char *p2; p2=(char*)malloc(20); memset (p2, 0, 20); while(*p2++ = *p1++); printf(“%s\n”,p2);> } The pointer p2 value is also increasing with p1 . *p2++ = *p1++ means copy value of *p1 to *p2 , then increment both addresses (p... 2007-02-26, 6496👍, 0💬

Runable Interface and Thread
What is more advisable to create a thread, by implementing a Runnable interface or by extending Thread class? Strategically speaking, threads created by implementing Runnable interface are more advisable. If you create a thread by extending a thread class, you cannot extend any other class. If you c... 2007-03-03, 6493👍, 0💬

Invoking run() Method of a Thread
What invokes a thread's run() method? After a thread is started, via its start() method of the Thread class, the JVM invokes the thread's run() method when the thread is initially executed. 2007-03-03, 6491👍, 0💬

equals() - String Comparison
What would you use to compare two String variables - the operator == or the method equals()? You can use operator == and method equals() for different types of comparisons: Using operator == to compare two string variables to see if they point the same String object. Using equals() to compare two st... 2007-03-03, 6482👍, 0💬

Variables in Double Quoted Strings
Would I use print "$a dollars" or "{$a} dollars" to print out the amount of dollars in this example? In this example, "$a dollars" or "{$a} dollars" will print the same result. But in other cases, you need to use curly braces to protect variable names. For example, for following PHP script will prin... 2007-02-27, 6474👍, 0💬

Pointer to Constants
What is the difference between const char* p and char const* p? In const char* p, the character pointed by "p" is constant, so you can not change the value of character pointed by p but u can make "p" refer to some other location. In char const* p, the pointer "p" is constant not the character refer... 2007-02-26, 6473👍, 0💬

What is the difference between System exceptions and Application exceptions?
.NET INTERVIEW QUESTIONS - What is the difference between System exceptions and Application exceptions? All exception derives from Exception Base class. Exceptions can be generated programmatically or can be generated by system. Application Exception serves as the base class for all applicationspeci... 2010-04-27, 6468👍, 0💬

Infinite Loops
How can you write a loop indefinitely? Two examples are listed in the following code: for(;;) { ... } while(true) { ... } 2007-03-03, 6462👍, 0💬

Overriding Defined Macros
How do you override a defined macro? You can use the #undef preprocessor directive to undefine (override) a previously defined macro. 2007-02-26, 6444👍, 0💬

Vector and ArrayList Classes
What is the main difference between a Vector and an ArrayList? Java Vector class is internally synchronized and ArrayList is not. 2007-03-03, 6441👍, 0💬

Number of Days between Two Dates
How can we know the number of days between two given dates in PHP? Simple arithmetic: &lt;?php $date1 = date('Y-m-d'); $date2 = '2006-07-01'; $days = (strtotime($date1) - strtotime($date2)) / (60 * 60 * 24); $days = (int) $days; echo "Number of days since '2006-07-01': $days"; ?&gt; 2007-02-27, 6432👍, 0💬

<< < 1 2 3 4 5 6 7 8 9 10 11 … > >>   Sort: Date

.NET C C++ CSS DBA General HTML Java JavaScript JSP JUnit MySQL Networking Oracle Perl Perl PHP PL/SQL RSS Software QA SQL Server Struts Unix Windows XHTML XML