C Programming · all questions

Standard Library Functions
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250

Questions

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Q221

Some types and macros defined under the header file stddef.h may be defined under other header files too.

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Q222

What will be the output of the following C code?

int main(void)
{
    int rc;
    rc = system("time");
    exit(0);
}

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Q223

Which of the following statement is correct?

double x, y, z;
x = 5.123456;
z= modf(x, *y);

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Q224

sqrt(x) function is not faster than the apparent equivalent pow(x,0.5).

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Q225

Initial seed is . . . . . . . . for the function srand(unsigned int seed).

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Q226

The value of tm_isdst is . . . . . . . . when DST( Daylight Savings Time) is in effect, . . . . . . . . when DST is not in effect and . . . . . . . . when the DST status is unknown.

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Q227

The behavior is undefined if more than one call to the exit function is executed by a program.

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Q228

What is the function of the given longjump(jmp_buf buf, i)?

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Q229

Which of the given function is a library function under the header math.h?

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Q230

Which header file is used to define data formats and currency symbols?

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Q231

The three macros defined by stdarg.h is . . . . . . . .

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Q232

. . . . . . . . macro must be called before using . . . . . . . . and . . . . . . . .

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Q233

Point out the error (if any) in the following C code?

#include <stdlib.h>
#include <stdio.h>
int main(void)
{
    int* p = NULL;
    struct S *s = NULL;
    void(*f)(int, double) = NULL;
    char *ptr = malloc(15);
    if (ptr == NULL) printf("Out of memory");
    free(ptr);
}

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Q234

What will be the output of the following C code if the system date is 6/2/2017 (Friday)?

#include<stdio.h>
#include<time.h>
int main()
{
    struct tm *ptr;
    time_t t;
    char str[100];
    t = time(NULL);
    ptr = localtime(&t);
    strftime(str,100,"%A",ptr);
    puts(str);
    return 0;
}

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Q235

Which macro sets everything defined under locale. h?

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Q236

The void longjmp( jmp-buf env, int val) function causes setjmp() macro to return . . . . . . . . value; if val is 0.

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Q237

Which of the following functions is used to convert the date and time into a calendar format?

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Q238

What does raise functions declared in signal.h do?

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Q239

Which function converts the wide-character string to a multibyte string?

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Q240

Select the macro that abnormally terminates the program.

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