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- Question
Out of fgets() and gets() which function is safe to use?
Options- A. gets()
- B. fgets()
- Correct Answer
- fgets()
ExplanationBecause, In fgets() we can specify the size of the buffer into which the string supplied will be stored. - 1. To scan a and b given below, which of the following scanf() statement will you use?
#include<stdio.h> float a; double b;
Options- A. scanf("%f %f", &a, &b);
- B. scanf("%Lf %Lf", &a, &b);
- C. scanf("%f %Lf", &a, &b);
- D. scanf("%f %lf", &a, &b); Discuss
- 2. Which of the following function is more appropriate for reading in a multi-word string?
Options- A. printf();
- B. scanf();
- C. gets();
- D. puts(); Discuss
- 3. Which of the following function is correct that finds the length of a string?
Options- A.
int xstrlen(char *s) { int length=0; while(*s!='\0') { length++; s++; } return (length); } - B.
int xstrlen(char s) { int length=0; while(*s!='\0') length++; s++; return (length); } - C.
int xstrlen(char *s) { int length=0; while(*s!='\0') length++; return (length); } - D.
int xstrlen(char *s) { int length=0; while(*s!='\0') s++; return (length); }
Discuss
- 4. If the two strings are identical, then strcmp() function returns
Options- A. -1
- B. 1
- C. 0
- D. Yes Discuss
- 5. Which of the following function sets first n characters of a string to a given character?
Options- A. strinit()
- B. strnset()
- C. strset()
- D. strcset() Discuss
- 6. To print out a and b given below, which of the following printf() statement will you use?
#include<stdio.h> float a=3.14; double b=3.14;
Options- A. printf("%f %lf", a, b);
- B. printf("%Lf %f", a, b);
- C. printf("%Lf %Lf", a, b);
- D. printf("%f %Lf", a, b); Discuss
- 7. In a file contains the line "I am a boy\r\n" then on reading this line into the array str using fgets(). What will str contain?
Options- A. "I am a boy\r\n\0"
- B. "I am a boy\r\0"
- C. "I am a boy\n\0"
- D. "I am a boy" Discuss
- 8. Which files will get closed through the fclose() in the following program?
#include<stdio.h> int main() { FILE *fs, *ft, *fp; fp = fopen("A.C", "r"); fs = fopen("B.C", "r"); ft = fopen("C.C", "r"); fclose(fp, fs, ft); return 0; }
Options- A. "A.C" "B.C" "C.C"
- B. "B.C" "C.C"
- C. "A.C"
- D. Error in fclose() Discuss
- 9. What is the purpose of "rb" in fopen() function used below in the code?
FILE *fp; fp = fopen("source.txt", "rb");
Options- A. open "source.txt" in binary mode for reading
- B. open "source.txt" in binary mode for reading and writing
- C. Create a new file "source.txt" for reading and writing
- D. None of above Discuss
- 10. Consider the following program and what will be content of t?
#include<stdio.h> int main() { FILE *fp; int t; fp = fopen("DUMMY.C", "w"); t = fileno(fp); printf("%d\n", t); return 0; }
Options- A. size of "DUMMY.C" file
- B. The handle associated with "DUMMY.C" file
- C. Garbage value
- D. Error in fileno() Discuss
Input / Output problems
Search Results
Correct Answer: scanf("%f %lf", &a, &b);
Explanation:
To scan a float value, %f is used as format specifier.
To scan a double value, %lf is used as format specifier.
Therefore, the answer is scanf("%f %lf", &a, &b);
Correct Answer: gets();
Explanation:
gets(); collects a string of characters terminated by a new line from the standard input stream stdin
#include <stdio.h>
int main(void)
{
char string[80];
printf("Enter a string:");
gets(string);
printf("The string input was: %s\n", string);
return 0;
}
Output:
Enter a string: CuriousTab
The string input was: CuriousTab
Correct Answer:
int xstrlen(char *s)
{
int length=0;
while(*s!='\0')
{ length++; s++; }
return (length);
}
Explanation:
Option A is the correct function to find the length of given string.
Example:
#include<stdio.h>
int xstrlen(char *s)
{
int length=0;
while(*s!='\0')
{ length++; s++; }
return (length);
}
int main()
{
char d[] = "CuriousTab";
printf("Length = %d\n", xstrlen(d));
return 0;
}
Output: Length = 8
Correct Answer: 0
Explanation:
Declaration: strcmp(const char *s1, const char*s2);
The strcmp return an int value that is
if s1 < s2 returns a value < 0
if s1 == s2 returns 0
if s1 > s2 returns a value > 0
Correct Answer: strnset()
Explanation:
Declaration:
char *strnset(char *s, int ch, size_t n); Sets the first n characters of s to ch
#include <stdio.h>
#include <string.h>
int main(void)
{
char *string = "abcdefghijklmnopqrstuvwxyz";
char letter = 'x';
printf("string before strnset: %s\n", string);
strnset(string, letter, 13);
printf("string after strnset: %s\n", string);
return 0;
}
Output:
string before strnset: abcdefghijklmnopqrstuvwxyz
string after strnset: xxxxxxxxxxxxxnopqrstuvwxyz
Correct Answer: printf("%f %lf", a, b);
Explanation:
To print a float value, %f is used as format specifier.
To print a double value, %lf is used as format specifier.
Therefore, the answer is printf("%f %lf", a, b);
Correct Answer: "I am a boy\n\0"
Explanation:
Declaration: char *fgets(char *s, int n, FILE *stream);
fgets reads characters from stream into the string s. It stops when it reads either n - 1 characters or a newline character, whichever comes first.
Therefore, the string str contain "I am a boy\n\0"
Correct Answer: Error in fclose()
Explanation:
Extra parameter in call to fclose().
Correct Answer: open "source.txt" in binary mode for reading
Explanation:
The file source.txt will be opened in the binary mode.
Correct Answer: The handle associated with "DUMMY.C" file
Explanation:
fp = fopen("DUMMY.C", "w"); A file DUMMY.C is opened in write mode and returns the file pointer to fp
t = fileno(fp); returns the handle for the fp stream and it stored in the variable t
printf("%d\n", t); It prints the handle number.
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