IndiaBIX

C Programming - Library Functions

Why should I learn to solve C Programming questions and answers section on "Library Functions"?

Learn and practise solving C Programming questions and answers section on "Library Functions" to enhance your skills so that you can clear interviews, competitive examinations, and various entrance tests (CAT, GATE, GRE, MAT, bank exams, railway exams, etc.) with full confidence.

Where can I get the C Programming questions and answers section on "Library Functions"?

IndiaBIX provides you with numerous C Programming questions and answers based on "Library Functions" along with fully solved examples and detailed explanations that will be easy to understand.

Where can I get the C Programming section on "Library Functions" MCQ-type interview questions and answers (objective type, multiple choice)?

Here you can find multiple-choice C Programming questions and answers based on "Library Functions" for your placement interviews and competitive exams. Objective-type and true-or-false-type questions are given too.

How do I download the C Programming questions and answers section on "Library Functions" in PDF format?

You can download the C Programming quiz questions and answers section on "Library Functions" as PDF files or eBooks.

How do I solve C Programming quiz problems based on "Library Functions"?

You can easily solve C Programming quiz problems based on "Library Functions" by practising the given exercises, including shortcuts and tricks.

Exercise : Library Functions - General Questions
1.
What will the function rewind() do?
Reposition the file pointer to a character reverse.
Reposition the file pointer stream to end of file.
Reposition the file pointer to begining of that line.
Reposition the file pointer to begining of file.
Answer: Option
Explanation:
rewind() takes the file pointer to the beginning of the file. so that the next I/O operation will take place at the beginning of the file.
Example: rewind(FilePointer);
2.
Input/output function prototypes and macros are defined in which header file?
conio.h
stdlib.h
stdio.h
dos.h
Answer: Option
Explanation:
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.
3.
Which standard library function will you use to find the last occurance of a character in a string in C?
strnchar()
strchar()
strrchar()
strrchr()
Answer: Option
Explanation:

strrchr() returns a pointer to the last occurrence of character in a string.

Example:


#include <stdio.h>
#include <string.h>

int main()
{
    char str[30] = "12345678910111213";
    printf("The last position of '2' is %d.\n",
            strrchr(str, '2') - str);
    return 0;
}

Output: The last position of '2' is 14.

4.
What is stderr ?
standard error
standard error types
standard error streams
standard error definitions
Answer: Option
Explanation:
The standard error(stderr) stream is the default destination for error messages and other diagnostic warnings. Like stdout, it is usually also directed to the output device of the standard console (generally, the screen).
5.
Does there any function exist to convert the int or float to a string?
Yes
No
Answer: Option
Explanation:

1. itoa() converts an integer to a string.
2. ltoa() converts a long to a string.
3. ultoa() converts an unsigned long to a string.
4. sprintf() sends formatted output to a string, so it can be used to convert any type of values to string type.

#include<stdio.h>
#include<stdlib.h>

int main(void)
{
   int   num1 = 12345;
   float num2 = 5.12;
   char str1[20];
   char str2[20];

   itoa(num1, str1, 10); /* 10 radix value */
   printf("integer = %d string = %s \n", num1, str1);

   sprintf(str2, "%f", num2);
   printf("float = %f string = %s", num2, str2);

   return 0;
}

// Output:
// integer = 12345 string = 12345
// float = 5.120000 string = 5.120000

Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers