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- Question
Does there any function exist to convert the int or float to a string?
Options- A. Yes
- B. No
- Correct Answer
- Yes
Explanation1. 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
Library Functions problems
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- 1. 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
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; }- 2. 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
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.- 3. What is stderr?
Options- A. standard error
- B. standard error types
- C. standard error streams
- D. standard error definitions Discuss
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).- 4. Can you use the fprintf() to display the output on the screen?
Options- A. Yes
- B. No Discuss
Correct Answer: Yes
Explanation:
Do like this fprintf(stdout, "%s %d %f", str, i, a);- 5. 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 Discuss
Correct Answer: stdio.h
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.- 6. If the binary eauivalent of 5.375 in normalised form is 0100 0000 1010 1100 0000 0000 0000 0000, what will be the output of the program (on intel machine)?
#include<stdio.h> #include<math.h> int main() { float a=5.375; char *p; int i; p = (char*)&a; for(i=0; i<=3; i++) printf("%02x\n", (unsigned char)p[i]); return 0; }
Options- A. 40 AC 00 00
- B. 04 CA 00 00
- C. 00 00 AC 40
- D. 00 00 CA 04 Discuss
Correct Answer: 00 00 AC 40
- 7. What will you do to treat the constant 3.14 as a long double?
Options- A. use 3.14LD
- B. use 3.14L
- C. use 3.14DL
- D. use 3.14LF Discuss
Correct Answer: use 3.14L
Explanation:
Given 3.14 is a double constant.To specify 3.14 as long double, we have to add L to the 3.14. (i.e 3.14L)
- 8. What will you do to treat the constant 3.14 as a float?
Options- A. use float(3.14f)
- B. use 3.14f
- C. use f(3.14)
- D. use (f)(3.14) Discuss
Correct Answer: use 3.14f
Explanation:
Given 3.14 is a double constant.
To specify 3.14 as float, we have to add f to the 3.14. (i.e 3.14f)
- 9. The binary equivalent of 5.375 is
Options- A. 101.101110111
- B. 101.011
- C. 101011
- D. None of above Discuss
Correct Answer: 101.011
- 10. We want to round off x, a float, to an int value, The correct way to do is
Options- A. y = (int)(x + 0.5)
- B. y = int(x + 0.5)
- C. y = (int)x + 0.5
- D. y = (int)((int)x + 0.5) Discuss
Correct Answer: y = (int)(x + 0.5)
Explanation:
Rounding off a value means replacing it by a nearest value that is approximately equal or smaller or greater to the given number.y = (int)(x + 0.5); here x is any float value. To roundoff, we have to typecast the value of x by using (int)
Example:
#include <stdio.h> int main () { float x = 3.6; int y = (int)(x + 0.5); printf ("Result = %d\n", y ); return 0; }Output:
Result = 4.
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