C Programming :: Declarations and Initializations

True / False Questions:

1.	A long double can be used if range of a double is not enough to accommodate a real number.
	A. True B. False Answer & Explanation Answer: Option A Explanation: True, we can use long double; if double range is not enough. double = 8 bytes. long double = 10 bytes.

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2.	A float is 4 bytes wide, whereas a double is 8 bytes wide.
	A. True B. False Answer & Explanation Answer: Option A Explanation: True, float = 4 bytes. double = 8 bytes.

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3.	If the definition of the external variable occurs in the source file before its use in a particular function, then there is no need for an extern declaration in the function.
	A. True B. False

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4.	Size of short integer and long integer can be verified using the sizeof() operator.
	A. True B. False Answer & Explanation Answer: Option A Explanation: True, we can find the size of short integer and long integer using the sizeof() operator. Example: #include<stdio.h> int main() { short int i = 10; long int j = 10; printf("short int is %d bytes.,\nlong int is %d bytes.", sizeof(i),sizeof(j)); return 0; } Output: short int is 2 bytes. long int is 4 bytes.

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5.	Range of double is -1.7e-38 to 1.7e+38 (in 16 bit platform - Turbo C under DOS)
	A. True B. False Answer & Explanation Answer: Option B Explanation: False, The range of double is -1.7e+308 to 1.7e+308.

6.	Size of short integer and long integer would vary from one platform to another.
	A. True B. False Answer & Explanation Answer: Option A Explanation: True, Depending on the operating system/compiler/system architecture you are working on, the range of data types can vary.

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7.	Range of float id -2.25e+308 to 2.25e+308
	A. True B. False Answer & Explanation Answer: Option B Explanation: False, The range of float is -3.4e+38 to 3.4e+38.