C Quiz #04: Datatypes and Variable

Please go though C Programming #04: Datatypes and Variable before taking this quiz.

Question 1: What are the basic data types that C supports ?
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Character, Integer, Float, Double.

 Question 2: Is string a native data type in C ?
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NO

Question 3: what is following statement called in "int a; "? 
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Variable Declaration.

Question 4: Where are variables stored ?
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RAM.

Question 5: Is it valid name "int 007_Agent;"
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NO, Variables should not start with number. Here is the complete list of rules that has to be followed for valid Variable name in C.

Question 6: What are the three things associated with variable ?
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Hence associated with each variable there is following associated.

1. Name 
2. Data type
3. Memory address

Question 7: Why variables having a name ?
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Since data are stored in memory. Each data have memory address in RAM. we could have used this memory address directly. if we had done like this program would have become unreadable, with all address in them. It would be very hard to track which address has which data. Hence computer engineers have this address a name and called it variable. Hence, A variable is the name for a place in the computer's memory where you store some data.

Question 8: Why variables have data type ?
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For example to represent char we use ASCII, ASCII chart has 128 characters. Hence we can represent in 7 bits (2^7 = 128). While a integer number 3421 in decimal, (D5D in hex ) can be represented in 12 bits. Hence each data takes different amount of memory, Hence type tells us how much amount of memory is required. NOTE: size of char variable in not 7 bit in C and size of integer is not 12 bit in C.

Question 9: What is size of integer in 32 bit Computer ?
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4 byte.

Question 10: what is use of sizeof operator ?
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It is used to find the sizeof any variable/constant.