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- Question
Input/output function prototypes and macros are defined in which header file?
Options- A. conio.h
- B. stdlib.h
- C. stdio.h
- D. dos.h
- Correct Answer
- stdio.h
Explanationstdio.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. - 1. Which standard library function will you use to find the last occurance of a character in a string in C?
Options- A. strnchar()
- B. strchar()
- C. strrchar()
- D. strrchr() Discuss
- 2. What will the function rewind() do?
Options- A. Reposition the file pointer to a character reverse.
- B. Reposition the file pointer stream to end of file.
- C. Reposition the file pointer to begining of that line.
- D. Reposition the file pointer to begining of file. Discuss
- 3. What will be the output of the program?
#include<stdio.h> int main() { const c = -11; const int d = 34; printf("%d, %d\n", c, d); return 0; }
Options- A. Error
- B. -11, 34
- C. 11, 34
- D. None of these Discuss
- 4. What will be the output of the program?
#include<stdio.h> int main() { const int x=5; const int *ptrx; ptrx = &x; *ptrx = 10; printf("%d\n", x); return 0; }
Options- A. 5
- B. 10
- C. Error
- D. Garbage value Discuss
- 5. What will be the output of the program?
#include<stdio.h> #include<stdlib.h> union employee { char name[15]; int age; float salary; }; const union employee e1; int main() { strcpy(e1.name, "K"); printf("%s %d %f", e1.name, e1.age, e1.salary); return 0; }
Options- A. Error: RValue required
- B. Error: cannot convert from 'const int *' to 'int *const'
- C. Error: LValue required in strcpy
- D. No error Discuss
- 6. Can you use the fprintf() to display the output on the screen?
Options- A. Yes
- B. No Discuss
- 7. What is stderr?
Options- A. standard error
- B. standard error types
- C. standard error streams
- D. standard error definitions Discuss
- 8. What is the purpose of fflush() function.
Options- A. flushes all streams and specified streams.
- B. flushes only specified stream.
- C. flushes input/output buffer.
- D. flushes file buffer. Discuss
- 9. What will the function randomize() do in Turbo C under DOS?
Options- A. returns a random number.
- B. returns a random number generator in the specified range.
- C. returns a random number generator with a random value based on time.
- D. return a random number with a given seed value. Discuss
- 10. Does there any function exist to convert the int or float to a string?
Options- A. Yes
- B. No Discuss
Library Functions problems
Search Results
Correct Answer: strrchr()
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.
Correct Answer: Reposition the file pointer to begining of file.
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);
Example: rewind(FilePointer);
Correct Answer: -11, 34
Explanation:
Step 1: const c = -11; The constant variable 'c' is declared and initialized to value "-11".
Step 2: const int d = 34; The constant variable 'd' is declared as an integer and initialized to value '34'.
Step 3: printf("%d, %d\n", c, d); The value of the variable 'c' and 'd' are printed.
Hence the output of the program is -11, 34
Correct Answer: Error
Explanation:
Step 1: const int x=5; The constant variable x is declared as an integer data type and initialized with value '5'.
Step 2: const int *ptrx; The constant variable ptrx is declared as an integer pointer.
Step 3: ptrx = &x; The address of the constant variable x is assigned to integer pointer variable ptrx.
Step 4: *ptrx = 10; Here we are indirectly trying to change the value of the constant vaiable x. This will result in an error.
To change the value of const variable x we have to use *(int *)&x = 10;
Correct Answer: No error
Explanation:
The output will be (in 16-bit platform DOS):
K 75 0.000000Correct Answer: Yes
Explanation:
Do like this
fprintf(stdout, "%s %d %f", str, i, a);
Correct Answer: standard error streams
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).
Correct Answer: flushes all streams and specified streams.
Explanation:
"fflush()" flush any buffered output associated with filename, which is either a file opened for writing or a shell command for redirecting output to a pipe or coprocess.
Example:
fflush(FilePointer);
fflush(NULL); flushes all streams.
Example:
fflush(FilePointer);
fflush(NULL); flushes all streams.
Correct Answer: returns a random number generator with a random value based on time.
Explanation:
The randomize() function initializes the random number generator with a random value based on time. You can try the sample program given below in Turbo-C, it may not work as expected in other compilers.
/* Prints a random number in the range 0 to 99 */
#include <stdlib.h>
#include <stdio.h>
#include <time.h>
int main(void)
{
randomize();
printf("Random number in the 0-99 range: %d\n", random (100));
return 0;
}
Correct Answer: Yes
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.
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
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