When is a switch statement better than multiple if statements?
Dec 9th
A switch statement is generally best to use when you have more than two conditional expressions based on a single variable of numeric type.
When should a type cast not be used?
Dec 9th
A type cast should not be used to override a const or volatile declaration. Overriding these type modifiers can cause the program to fail to run correctly. A type cast should not be used to turn a pointer to one type of structure or data type into another. In the rare events in which this action is beneficial, using a union to hold the values makes the programmer’s intentions clearer.
What are advantages and disadvantages of external storage class?
Dec 9th
Advantages of external storage class 1)Persistent storage of a variable retains the latest value 2)The value is globally available Disadvantages of external storage class 1)The storage for an external variable exists even when the variable is not needed 2)The side effect may produce surprising output 3)Modification of the program is difficult 4)Generality of a program is affected
How many levels deep can include files be nested?
Dec 9th
Even though there is no limit to the number of levels of nested include files you can have, your compiler might run out of stack space while trying to include an inordinately high number of files. This number varies according to your hardware configuration and possibly your compiler.
What is an argument? Differentiate between formal arguments and actual arguments?
Dec 9th
An argument is an entity used to pass the data from calling function to the called function. Formal arguments are the arguments available in the function definition. They are preceded by their own data types. Actual arguments are available in the function call.
What is the difference between a string and an array?
Dec 9th
An array is an array of anything. A string is a specific kind of an array with a well-known convention to determine its length. There are two kinds of programming languages: those in which a string is just an array of characters, and those in which it’s a special type. In C, a string is just an array of characters (type char), with one wrinkle: a C string always ends with a NUL character.
The “value” of an array is the same as the address of (or a pointer to) the first element; so, frequently, a C string and a More >
Differentiate between an internal static and external static variable?
Dec 9th
An internal static variable is declared inside a block with static storage class whereas an external static variable is declared outside all the blocks in a file.An internal static variable has persistent storage,block scope and no linkage.An external static variable has permanent storage,file scope and internal linkage.
What is an lvalue?
Dec 9th
An lvalue is an expression to which a value can be assigned. The lvalue expression is located on the left side of an assignment statement, whereas an rvalue is located on the right side of an assignment statement. Each assignment statement must have an lvalue and an rvalue. The lvalue expression must reference a storable variable in memory. It cannot be a constant.
What is the difference between declaring a variable and defining a variable?
Dec 9th
Declaring a variable means describing its type to the compiler but not allocating any space for it. Defining a variable means declaring it and also allocating space to hold the variable. You can also initialize a variable at the time it is defined.
What is modular programming?
Dec 9th
If a program is large, it is subdivided into a number of smaller programs that are called modules or subprograms. If a complex problem is solved using more modules, this approach is known as modular programming.
