Which compiler switch to be used for compiling the programs using math library with gcc compiler?

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418. How do you construct an increment statement or decrement statement in C?

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419. What is the difference between Call by Value and Call by Reference?

Answer: When using Call by Value, you are sending the value of a variable as parameter to a function, whereas Call by Reference sends the address of the variable. Also, under Call by Value, the value in the parameter is not affected by whatever operation that takes place, while in the case of Call by Reference, values can be affected by the process within the function.

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420. What is a sequential access file?

Answer: When writing programs that will store and retrieve data in a file, it is possible to designate that file into different forms. A sequential access file is such that data are saved in sequential order: one data is placed into the file after another. To access a particular data within the sequential access file, data has to be read one data at a time, until the right one is reached.

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421. What is variable initialization and why is it important?

Answer: This refers to the process wherein a variable is assigned an initial value before it is used in the program. Without initialization, a variable would have an unknown value, which can lead to unpredictable outputs when used in computations or other operations.

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422. Differentiate Source Codes from Object Codes

Answer: Source codes are codes that were written by the programmer. It is made up of the commands and other English-like keywords that are supposed to instruct the computer what to do. However, computers would not be able to understand source codes. Therefore, source codes are compiled using a compiler. The resulting outputs are object codes, which are in a format that can be understood by the computer processor. In C programming, source codes are saved with the file extension .C, while object codes are saved with the file extension .OBJ

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423. What is the use of a ? character?

Answer: It is referred to as a terminating null character, and is used primarily to show the end of a string value.

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424. What is the difference between the = symbol and == symbol?

Answer:

The = symbol is often used in mathematical operations. It is used to assign a value to a given variable. On the other hand, the == symbol, also known as "equal to" or "equivalent to", is a relational operator that is used to compare two values.

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425. What is the modulus operator?

Answer: The modulus operator outputs the remainder of a division. It makes use of the percentage (%) symbol. For example: 10 % 3 = 1, meaning when you divide 10 by 3, the remainder is 1.

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426. What is a nested loop?

Answer:

A nested loop is a loop that runs within another loop. Put it in another sense, you have an inner loop that is inside an outer loop. In this scenario, the inner loop is performed a number of times as specified by the outer loop. For each turn on the outer loop, the inner loop is first performed.

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427. Which of the following operators is incorrect and why? ( >=, <=, <>, ==)

Answer: <> is incorrect. While this operator is correctly interpreted as "not equal to" in writing conditional statements, it is not the proper operator to be used in C programming. Instead, the operator != must be used to indicate "not equal to" condition.

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