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- Question
What will be the output of the program?
#include<stdio.h> int main() { int i=2; printf("%d, %d\n", ++i, ++i); return 0; }
Options- A. 3, 4
- B. 4, 3
- C. 4, 4
- D. Output may vary from compiler to compiler
- Correct Answer
- Output may vary from compiler to compiler
ExplanationThe order of evaluation of arguments passed to a function call is unspecified.Anyhow, we consider ++i, ++i are Right-to-Left associativity. The output of the program is 4, 3.
In TurboC, the output will be 4, 3.
In GCC, the output will be 4, 4.
More questions
- 1. 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
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.
- 2. Is there any difference between following declarations?
1 : extern int fun(); 2 : int fun();
Options- A. Both are identical
- B. No difference, except extern int fun(); is probably in another file
- C. int fun(); is overrided with extern int fun();
- D. None of these Discuss
Correct Answer: No difference, except extern int fun(); is probably in another file
Explanation:
extern int fun(); declaration in C is to indicate the existence of a global function and it is defined externally to the current module or in another file.int fun(); declaration in C is to indicate the existence of a function inside the current module or in the same file.
- 3. A preprocessor directive is a message from programmer to the preprocessor.
Options- A. True
- B. False Discuss
Correct Answer: True
Explanation:
True, the programmer tells the compiler to include the preprocessor when compiling.- 4. Which of the statements is correct about the program?
#include<stdio.h> int main() { int arr[3][3] = {1, 2, 3, 4}; printf("%d\n", *(*(*(arr)))); return 0; }
Options- A. Output: Garbage value
- B. Output: 1
- C. Output: 3
- D. Error: Invalid indirection Discuss
Correct Answer: Error: Invalid indirection
- 5. Which of the following is the correct order of evaluation for the below expression?
z = x + y * z / 4 % 2 - 1
Options- A. * / % + - =
- B. = * / % + -
- C. / * % - + =
- D. * % / - + = Discuss
Correct Answer: * / % + - =
Explanation:
C uses left associativity for evaluating expressions to break a tie between two operators having same precedence.- 6. Declare the following statement?
"An array of three pointers to chars".
Options- A.
char *ptr[3](); - B.
char *ptr[3]; - C.
char (*ptr[3])(); - D.
char **ptr[3];
Discuss
Correct Answer:char *ptr[3];
- 7. What will be the output of the program?
#include<stdio.h> int check (int, int); int main() { int c; c = check(10, 20); printf("c=%d\n", c); return 0; } int check(int i, int j) { int *p, *q; p=&i; q=&j; i>=45? return(*p): return(*q); }
Options- A. Print 10
- B. Print 20
- C. Print 1
- D. Compile error Discuss
Correct Answer: Compile error
Explanation:
There is an error in this line i>=45 ? return(*p): return(*q);. We cannot use return keyword in the terenary operators.- 8. If the file 'source.txt' contains a line "Be my friend" which of the following will be the output of below program?
#include<stdio.h> int main() { FILE *fs, *ft; char c[10]; fs = fopen("source.txt", "r"); c[0] = getc(fs); fseek(fs, 0, SEEK_END); fseek(fs, -3L, SEEK_CUR); fgets(c, 5, fs); puts(c); return 0; }
Options- A. friend
- B. frien
- C. end
- D. Error in fseek(); Discuss
Correct Answer: end
Explanation:
The file source.txt contains "Be my friend".fseek(fs, 0, SEEK_END); moves the file pointer to the end of the file.
fseek(fs, -3L, SEEK_CUR); moves the file pointer backward by 3 characters.
fgets(c, 5, fs); read the file from the current position of the file pointer.
Hence, it contains the last 3 characters of "Be my friend".
Therefore, it prints "end".
- 9. What will be the output of the program?
#include<stdio.h> int addmult(int ii, int jj) { int kk, ll; kk = ii + jj; ll = ii * jj; return (kk, ll); } int main() { int i=3, j=4, k, l; k = addmult(i, j); l = addmult(i, j); printf("%d %d\n", k, l); return 0; }
Options- A. 12 12
- B. No error, No output
- C. Error: Compile error
- D. None of above Discuss
Correct Answer: 12 12
- 10. What will be the output of the program?
#include<stdio.h> #define MESS junk int main() { printf("MESS\n"); return 0; }
Options- A. junk
- B. MESS
- C. Error
- D. Nothing will print Discuss
Correct Answer: MESS
Explanation:
printf("MESS\n"); It prints the text "MESS". There is no macro calling inside the printf statement occured.
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