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- Question
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
- Correct Answer
- Error
ExplanationStep 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;
More questions
- 1. What does fp point to in the program?
#include<stdio.h> int main() { FILE *fp; fp=fopen("trial", "r"); return 0; }
Options- A. The first character in the file
- B. A structure which contains a char pointer which points to the first character of a file.
- C. The name of the file.
- D. The last character in the file. Discuss
Correct Answer: A structure which contains a char pointer which points to the first character of a file.
Explanation:
The fp is a structure which contains a char pointer which points to the first character of a file.- 2. 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).- 3. Which of the following statement obtains the remainder on dividing 5.5 by 1.3?
Options- A. rem = (5.5 % 1.3)
- B. rem = modf(5.5, 1.3)
- C. rem = fmod(5.5, 1.3)
- D. Error: we can't divide Discuss
Correct Answer: rem = fmod(5.5, 1.3)
Explanation:
fmod(x,y) - Calculates x modulo y, the remainder of x/y.
This function is the same as the modulus operator. But fmod() performs floating point divisions.Example:
#include <stdio.h> #include <math.h> int main () { printf ("fmod of 5.5 by 1.3 is %lf\n", fmod (5.5, 1.3) ); return 0; }Output:
fmod of 5.5 by 1.3 is 0.300000- 4. Which of the following range is a valid long double (Turbo C in 16 bit DOS OS)?
Options- A. 3.4E-4932 to 1.1E+4932
- B. 3.4E-4932 to 3.4E+4932
- C. 1.1E-4932 to 1.1E+4932
- D. 1.7E-4932 to 1.7E+4932 Discuss
Correct Answer: 3.4E-4932 to 1.1E+4932
Explanation:
The range of long double is 3.4E-4932 to 1.1E+4932- 5. Bitwise | can be used to set a bit in number.
Options- A. Yes
- B. No Discuss
Correct Answer: Yes
- 6. Can we have an array of bit fields?
Options- A. Yes
- B. No Discuss
Correct Answer: No
- 7. By default structure variable will be of auto storage class
Options- A. Yes
- B. No Discuss
Correct Answer: Yes
- 8. Bitwise can be used to reverse a sign of a number.
Options- A. Yes
- B. No Discuss
Correct Answer: No
- 9. Is it necessary that in a function which accepts variable argument list there should be at least be one fixed argument?
Options- A. Yes
- B. No Discuss
Correct Answer: Yes
- 10. Bitwise can be used to generate a random number.
Options- A. Yes
- B. No Discuss
Correct Answer: No
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- 1. What does fp point to in the program?