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- Question
Can you combine the following two statements into one?
char *p; p = (char*) malloc(100);
Options- A. char p = *malloc(100);
- B. char *p = (char) malloc(100);
- C. char *p = (char*)malloc(100);
- D. char *p = (char *)(malloc*)(100);
- Correct Answer
- char *p = (char*)malloc(100);
- 1. If a variable is a pointer to a structure, then which of the following operator is used to access data members of the structure through the pointer variable?
Options- A. .
- B. &
- C. *
- D. -> Discuss
- 2. What is (void*)0?
Options- A. Representation of NULL pointer
- B. Representation of void pointer
- C. Error
- D. None of above Discuss
- 3. In which header file is the NULL macro defined?
Options- A. stdio.h
- B. stddef.h
- C. stdio.h and stddef.h
- D. math.h Discuss
- 4. The operator used to get value at address stored in a pointer variable is
Options- A. *
- B. &
- C. &&
- D. || Discuss
- 5. Which of the following is the correct usage of conditional operators used in C?
Options- A. a>b ? c=30 : c=40;
- B. a>b ? c=30;
- C. max = a>b ? a>c?a:c:b>c?b:c
- D. return (a>b)?(a:b) Discuss
- 6. A pointer is
Options- A. A keyword used to create variables
- B. A variable that stores address of an instruction
- C. A variable that stores address of other variable
- D. All of the above Discuss
- 7. How many bytes are occupied by near, far and huge pointers (DOS)?
Options- A. near=2 far=4 huge=4
- B. near=4 far=8 huge=8
- C. near=2 far=4 huge=8
- D. near=4 far=4 huge=8 Discuss
- 8. What would be the equivalent pointer expression for referring the array element a[i][j][k][l]
Options- A. ((((a+i)+j)+k)+l)
- B. *(*(*(*(a+i)+j)+k)+l)
- C. (((a+i)+j)+k+l)
- D. ((a+i)+j+k+l) Discuss
- 9. Which of the following function is used to find the first occurrence of a given string in another string?
Options- A. strchr()
- B. strrchr()
- C. strstr()
- D. strnset() Discuss
- 10. How will you print \n on the screen?
Options- A. printf("\n");
- B. echo "\\n";
- C. printf('\n');
- D. printf("\\n"); Discuss
Pointers problems
Search Results
Correct Answer: ->
Correct Answer: Representation of NULL pointer
Correct Answer: stdio.h and stddef.h
Explanation:
The macro "NULL" is defined in locale.h, stddef.h, stdio.h, stdlib.h, string.h, time.h, and wchar.h.
Correct Answer: *
Correct Answer: max = a>b ? a>c?a:c:b>c?b:c
Explanation:
Option A: assignment statements are always return in paranthesis in the case of conditional operator. It should be a>b? (c=30):(c=40);
Option B: it is syntatically wrong.
Option D: syntatically wrong, it should be return(a>b ? a:b);
Option C: it uses nested conditional operator, this is logic for finding greatest number out of three numbers.
Correct Answer: A variable that stores address of other variable
Correct Answer: near=2 far=4 huge=4
Explanation:
near=2,
far=4 and
huge=4 pointers exist only under DOS. Under windows and Linux every pointers is 4 bytes long.
Correct Answer: *(*(*(*(a+i)+j)+k)+l)
Correct Answer: strstr()
Explanation:
The function strstr() Finds the first occurrence of a substring in another string
Declaration: char *strstr(const char *s1, const char *s2);
Return Value:
On success, strstr returns a pointer to the element in s1 where s2 begins (points to s2 in s1).
On error (if s2 does not occur in s1), strstr returns null.
Example:
#include <stdio.h>
#include <string.h>
int main(void)
{
char *str1 = "CuriousTab", *str2 = "ia", *ptr;
ptr = strstr(str1, str2);
printf("The substring is: %s\n", ptr);
return 0;
}
Output: The substring is: iaCURIOUSTAB
Correct Answer: printf("\\n");
Explanation:
The statement printf("\\n"); prints '\n' on the screen.
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