Which of the following is the correct code?
Answer: A
Correct answer: tanh(double x)
A function call or declaration needs the argument in parentheses: tanh(double x). tanh is the hyperbolic tangent, declared in <math.h> as double tanh(double).
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The prototypes of all standard library string functions are declared in the file string.h.
Answer: A
string.h is the header in the C standard library for the C programming language which contains macro definitions, constants, and declarations of functions and types used not only for string handling but also various memory handling functions.
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The macros defined under the header file limits.h are not defined under any other header file.
Answer: B
Correct answer: True
The statement as phrased - that the limits.h macros appear nowhere else - is true: CHAR_BIT, INT_MAX and their relatives are defined only in <limits.h>, and the floating-point limits only in <float.h>. Names such as NULL and size_t are the ones that appear in several headers.
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Initial seed is ________ for the function srand(unsigned int seed).
Answer: A
Correct answer: 1
If srand is never called, rand behaves as though srand(1) had been - the initial seed is 1. That is why an unseeded program produces the same sequence every time it runs.
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Which of the given options is an array type used for holding information?
Answer: C
Correct answer: jmp_buf
jmp_buf is an array type declared in <setjmp.h>, holding the calling environment - registers, stack pointer, program counter - saved by setjmp. Being an array is what lets it be passed to longjmp without an explicit &.
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What will the function randomize() do in Turbo C under DOS?
Answer: C
Correct answer: returns a random number generator with a random value based on time
randomize() seeds the random number generator from the system clock, so that a program produces a different sequence on each run. Without it, rand() starts from the same seed every time and repeats the same numbers - which is convenient for debugging and useless for a game.
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Which library function converts a string to a double-precision floating point value ?
Answer: C
Correct answer: atof()
atof() parses a string into a double, atoi() into an int and atol() into a long. strtok() is unrelated, splitting a string into tokens on a set of delimiters.
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ftell() returns the current position of the pointer in a file stream.
Answer: A
Correct answer: True
ftell(fp) returns the current position as a long - the byte offset from the start for a binary file. Its usual companion is fseek: save a position with ftell, read on, and return to it later.
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Which of the following macros is not defined?
Answer: A
Correct answer: ULONG_MIN
There is no ULONG_MIN, and there could be no use for one: the minimum of an unsigned type is always 0, so the standard defines only the maxima for unsigned types. Signed types get both, hence LONG_MIN and LONG_MAX.
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What will be the output of the program?
#include <stdio.h>
int main()
{
int i;
char c;
for(i=1; i<=5; i++)
{
scanf("%c", &c); /* given input is 'b' */
ungetc(c, stdout);
printf("%c", c);
ungetc(c, stdin);
}
return 0;
}
Answer: C
The ungetc() function pushes the character c back onto the named input stream, which must be open for reading.
This character will be returned on the next call to getc or fread for that stream.
One character can be pushed back in all situations.
A second call to ungetc without a call to getc will force the previous character to be forgotten.
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