The mbstowcs() function is used to return the number of array elements modified, not including a terminating zero code, if any.
Answer: A
Correct answer: true
mbstowcs() converts a multibyte string to a wide-character string and returns the number of wide characters written, not counting the terminating null - or (size_t)-1 if it meets an invalid multibyte sequence.
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Input/output function prototypes and macros are defined in which header file?
Answer: C
stdio.h, which stands for "standard input/output header", is the header in the C standard library that contains macro definitions, constants, and declarations of functions and types used for various standard input and output operations.
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Which function is used to recombine the fraction and exponent parts of a floating-point value after you have worked on them separately?
Answer: D
Correct answer: ldexp()
ldexp(x, n) computes \(x \times 2^{n}\) - it puts a fraction and an exponent back together. It is the inverse of frexp, which splits a value into those two parts. modf splits into integral and fractional parts, a different decomposition.
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The macro MB_LEN_MAX is used to find _________
Answer: A
Correct answer: Maximum number of bytes in a multi-byte character
MB_LEN_MAX, in <limits.h>, is the largest number of bytes any multibyte character can occupy in any supported locale - so a buffer of that size is always big enough. Its companion MB_CUR_MAX, in <stdlib.h>, gives the maximum for the locale currently in force.
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Which macro is used in the setlocale() function?
Answer: C
Correct answer: LC_MESSAGES
The category macros passed to setlocale are LC_ALL, LC_COLLATE, LC_CTYPE, LC_MONETARY, LC_NUMERIC, LC_TIME and, in POSIX, LC_MESSAGES. Each names one aspect of the locale, so that a program can, say, take its number formatting from one locale and its messages from another.
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Choose the right declaration of longjmp() function.
Answer: A
Correct answer: void longjmp(jmp_buf environment, int value)
longjmp takes the jmp_buf saved by setjmp and an int, and restores the saved environment - whereupon setjmp appears to return that value. A value of 0 is silently changed to 1, so that the caller can always distinguish a longjmp arrival from the original call.
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Which of the given option is declared under the header file stdlib.h?
Answer: D
Correct answer: EXIT_SUCCESS
EXIT_SUCCESS and EXIT_FAILURE are defined in <stdlib.h>, alongside NULL, RAND_MAX and MB_CUR_MAX. SEEK_CUR and SEEK_END belong to <stdio.h> and CLOCKS_PER_SEC to <time.h>.
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The library function clock() returns the number of _________ elapsed since the start of the program.
Answer: B
Correct answer: clock ticks
clock() returns processor time in implementation-defined units, clock ticks. To get seconds, divide by CLOCKS_PER_SEC. Note that it measures processor time used, not elapsed wall-clock time, so a program that spends its time waiting shows very little.
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What will be the output of the program?
#include <stdio.h>
#include <stdlib.h>
int main()
{
char *i = "55.555";
int result1 = 10;
float result2 = 11.111;
result1 = result1+atoi(i);
result2 = result2+atof(i);
printf("%d, %f", result1, result2);
return 0;
}
Answer: C
Function atoi() converts the string to integer.
Function atof() converts the string to float.
result1 = result1+atoi(i);
Here result1 = 10 + atoi(55.555);
result1 = 10 + 55;
result1 = 65;
result2 = result2+atof(i);
Here result2 = 11.111 + atof(55.555);
result2 = 11.111 + 55.555000;
result2 = 66.666000;
So the output is "65, 66.666000" .
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The _______ macro shall be invoked before any access to the unnamed arguments.
Answer: D
Correct answer: va_start
va_start must be called first: it initialises the va_list, using the last named parameter to work out where the unnamed ones begin. Only then may va_arg fetch them, and va_end must be called before the function returns.
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