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What is difference between multi character constant and string literals?
In C, you can assign integers multiple characters such that they fit in their size. For e.g.: int - 4 bytes char - 1 byte So an assignment like this is valid: int a = 'ABCD'; The first byte in a will be assigned the value of 'A', the second - 'B' and so on. A string literal is a character array constant. It is enclosed in double quotes and assignment can only be made to a char pointer. There is no limit on the size of the literal and it is terminated with a null character. e.g.: char str[] = "This is a trial";
What are literals in java?
In Java, a literal is the source code representation of a fixed value and are represented without requiring computation. The various types are Integer, Floating-Point, Character and String literals.
What is string class?
Strings are probably one of the most commonly used java data-types. They can hold almost anything that are enclosed within a pair of double quotes and hence are very versatile and powerful. This chapter covers the String class.Strings Are Immutable ObjectsHandling "strings" of characters is a fundamental aspect of most programming languages. In Java, each character in a string is a 16-bit Unicode character. Because Unicode characters are 16 bits, a rich, international set of characters is easily represented in Unicode.In Java, strings are objects. Just like other objects, you can create an instance of a String with the new keyword, as follows:String s = new String();This line of code creates a new object of class String, and assigns it to the reference variable s. So far, String objects seem just like other objects. Now, let's give the String a value:s = "abc";As you might expect, the String class has about a zillion constructors, so you can use a more efficient shortcut:String s = new String("abc");And just because you'll use strings all the time, you can even say this:String s = "abc";There are some subtle differences between these options that we'll discuss later, but what they have in common is that they all create a new String object, with a value of "abc", and assign it to a reference variable s. Now let's say that you want a second reference to the String object referred to by s:String s2 = s; //refer s2 to the same String as sString objects seem to be behaving just like other objects, so how is it that they are Immutable? Once you have assigned a String a value, that value can never change-it's immutable, frozen solid, won't change. The good news is that while the String object is immutable, its reference variable is not, so to continue with our previous example:s = s.concat(" efg");// the concat() method 'appends' a literal to the endDidn't I just say that Strings are immutable? Yes, I perfectly did. But, here the stuff within the double quotes that is passed as argument to the concat method gets appended to the end of the String s. How did this happen?The VM took the value of String s (which was "abc"), and added or rather appended " efg" onto the end, giving us the value "abc efg". Since Strings are immutable, the VM couldn't stuff this new value into the old String referenced by s, so it created a new String object, gave it the value "abc efg", and made s refer to it. At this point in our example, we have two String objects: the first one we created, with the value "abc", and the second one with the value "abc efg". Technically there are now three String objects, because the literal argument to concat, " efg", is itself a new String object. But we have references only to "abc" (referenced by s2) and "abc efg" (referenced by s).Note, however, that the original "abc" String didn't change; only the reference variable s was changed, so that it would refer to a different String.To wrap up, the original variable 's' in which we had "abc" as value would be abandoned and a new value "abc efg" would get assigned to it as soon as the s.concat(" efg") line of code is executed.
What are the examples of string constant?
In Java, a string constant is a text within double quotation marks. Example:String playerName = "Player 1"; // Assign a default name initiallyHere, the string constant was assigned to variable playerName. If you don't want the value to change later, declare it as final:final String greeting = "Hello!"
What is the puporse of using Val function in Visual basic 6.0?
Val() function is used in Visual Basic 6.0 to convert a string to a numeric value (such as integer, double etc.) or to extract a numeric value out of a string, as illustrated below.Val function as used to convert a string to a numeric valuefor example, let str be a string,Dim str as stringDim int as integerstr="09090"int=val(str)gives int = 9090also, used to extract the numeric part out of a following string,ie. a=val("98ASR_tyui") would give a=98however,b=val("The89")would give b=0 as there is no numeric value preceding the string.
