Standard Library Functions - C Programming MCQ Questions and Answers

61

What will be the output of the following C code?

char str[20];
str= "123546"; res= atof(str);
printf("String value = %s, Float value = %f\n", str, res);

A) String value = 123546, Float value = 123546.0 B) String value = 123546 , Float value = 123546.000000 C) String value = 123546 , Float value = 0.000000 D) String value = 123546 , Float value = 123546.000

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Answer & Solution

Answer: Option B

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62

The C library function . . . . . . . . function converts the wide character to its multibyte representation.

A) mblen() B) mbtowc() C) wcstombs() D) wctomb()

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Answer & Solution

Answer: Option D

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63

A domain error occurs if x is negative and y is not an integral value for the function pow(double x, double y).

A) true B) false

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Answer: Option A

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64

Which statement is correct work reference to endptr?

double strtod(const char *nptr, char **endptr);

A) A pointer to the starting string is stored in the object pointed to by endptr, provided that endptr is a null pointer B) A pointer to the ?nal string is stored in the object pointed to by endptr, provided that endptr is not a null pointer C) A pointer to the final string is stored in the object pointed to by endptr, provided that endptr is a null pointer D) A pointer to the starting string is stored in the object pointed to by endptr, provided that endptr is not a null pointer

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Answer & Solution

Answer: Option B

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65

Which of the following is the correct syntax of the function strtoul()?

A) unsigned long int strtoul(const char *n, char **ptr, int base) B) unsigned long int strtoul(const char *n, char **ptr) C) unsigned long int strtoul(const char *n) D) int strtoul(const char *n)

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Answer: Option A

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66

A less common use of setjmp.h is to create syntax similar to . . . . . . . .

A) errno B) variable arguments C) coroutines D) retval

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Answer & Solution

Answer: Option C

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67

What will be the output of the following C code?

double x=1.2
printf("%.1lf", ceil(x));

A) 1 B) 2 C) 1.0 D) 2.0

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Answer & Solution

Answer: Option D

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68

Which of the given function differs from the statement'errno is not neccessarily set on conversion error'?

A) atof() B) atoi() C) atol() D) strtod()

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Answer & Solution

Answer: Option D

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69

The macro MB_LEN_MAX is used to find . . . . . . . .

A) Maximum number of bytes in a multi-byte character B) Whether the given function is valid or not C) The maximum time taken for the execution of a particular function D) Maximum number of bits in a multi-byte character

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Answer: Option A

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70

Which function is called by macro assert to terminate the execution?

A) exit() B) atexit() C) abort() D) no function called

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Answer & Solution

Answer: Option C

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