What are reserved words?

C Programming Language > Overview of C Language > Basic Structure of C Programming

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Reserved words are words that are part of the standard C language library. This means that reserved words have special meaning and therefore cannot be used for purposes other than what it is originally intended for. Examples of reserved words are int, void, and return.

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455. Not all reserved words are written in lowercase. TRUE or FALSE?

Answer: FALSE. All reserved words must be written in lowercase; otherwise the C compiler would interpret this as unidentified and invalid

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456. What is the difference between the expression "++a" and "a++"?

Answer: In the first expression, the increment would happen first on variable a, and the resulting value will be the one to be used. This is also known as a prefix increment. In the second expression, the current value of variable a would the one to be used in an operation, before the value of a itself is incremented. This is also known as postfix increment.

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457. What is an endless loop?

Answer: An endless loop can mean two things. One is that it was designed to loop continuously until the condition within the loop is met, after which a break function would cause the program to step out of the loop. Another idea of an endless loop is when an incorrect loop condition was written, causing the loop to run erroneously forever. Endless loops are oftentimes referred to as infinite loops.

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458. What is wrong with this program statement? void = 10;

Answer: The word void is a reserved word in C language. You cannot use reserved words as a user-defined variable.

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459. Is this program statement valid? INT = 10.50;

Answer: Assuming that INT is a variable of type float, this statement is valid. One may think that INT is a reserved word and must not be used for other purposes. However, recall that reserved words are express in lowercase, so the C compiler will not interpret this as a reserved word.

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460. What are actual arguments?

Answer: When you create and use functions that need to perform an action on some given values, you need to pass these given values to that function. The values that are being passed into the called function are referred to as actual arguments.

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461. What are run-time errors?

Answer: These are errors that occur while the program is being executed. One common instance wherein run-time errors can happen is when you are trying to divide a number by zero. When run-time errors occur, program execution will pause, showing which program line caused the error.

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462. What is the difference between functions abs() and fabs()?

Answer: These 2 functions basically perform the same action, which is to get the absolute value of the given value. Abs() is used for integer values, while fabs() is used for floating type numbers. Also, the prototype for abs() is under , while fabs() is under .

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463. What are global variables and how do you declare them?

Answer: Global variables are variables that can be accessed and manipulated anywhere in the program. To make a variable global, place the variable declaration on the upper portion of the program, just after the preprocessor directives section.

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464. What are enumerated types?

Answer: Enumerated types allow the programmer to use more meaningful words as values to a variable. Each item in the enumerated type variable is actually associated with a numeric code. For example, one can create an enumerated type variable named DAYS whose values are Monday, Tuesday

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