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- Question
What is the output of the program?
#include<stdio.h> int main() { extern int a; printf("%d\n", a); return 0; } int a=20;
Options- A. 20
- B. 0
- C. Garbage Value
- D. Error
- Correct Answer
- 20
Explanationextern int a; indicates that the variable a is defined elsewhere, usually in a separate source code module.printf("%d\n", a); it prints the value of local variable int a = 20. Because, whenever there is a conflict between local variable and global variable, local variable gets the highest priority. So it prints 20.
More questions
- 1. What will be the output of the program?
#include<stdio.h> #include<string.h> int main() { char *s; char *fun(); s = fun(); printf("%s\n", s); return 0; } char *fun() { char buffer[30]; strcpy(buffer, "RAM"); return (buffer); }
Options- A. 0xffff
- B. Garbage value
- C. 0xffee
- D. Error Discuss
Correct Answer: Garbage value
Explanation:
The output is unpredictable since buffer is an auto array and will die when the control go back to main. Thus s will be pointing to an array , which not exists.- 2. How many bytes of memory will the following code reserve?
#include<stdio.h> #include<stdlib.h> int main() { int *p; p = (int *)malloc(256 * 256); if(p == NULL) printf("Allocation failed"); return 0; }
Options- A. 65536
- B. Allocation failed
- C. Error
- D. No output Discuss
Correct Answer: Allocation failed
Explanation:
Hence 256*256 = 65536 is passed to malloc() function which can allocate upto 65535. So the memory allocation will be failed in 16 bit platform (Turbo C in DOS).If you compile the same program in 32 bit platform like Linux (GCC Compiler) it may allocate the required memory.
- 3. What do the following declaration signify?
int (*pf)();
Options- A. pf is a pointer to function.
- B. pf is a function pointer.
- C. pf is a pointer to a function which return int
- D. pf is a function of pointer variable. Discuss
Correct Answer: pf is a pointer to a function which return int
- 4. What will be the output of the program?
#include<stdio.h> int main() { char str[] = "peace"; char *s = str; printf("%s\n", s++ +3); return 0; }
Options- A. peace
- B. eace
- C. ace
- D. ce Discuss
Correct Answer: ce
- 5. What will be the output of the program?
#include<stdio.h> int main() { int x=12, y=7, z; z = x!=4 || y == 2; printf("z=%d\n", z); return 0; }
Options- A. z=0
- B. z=1
- C. z=4
- D. z=2 Discuss
Correct Answer: z=1
Explanation:
Step 1: int x=12, y=7, z; here variable x, y and z are declared as an integer and variable x and y are initialized to 12, 7 respectively.Step 2: z = x!=4 || y == 2;
becomes z = 12!=4 || 7 == 2;
then z = (condition true) || (condition false); Hence it returns 1. So the value of z=1.Step 3: printf("z=%d\n", z); Hence the output of the program is "z=1".
- 6. What will be the output of the program?
#include<stdio.h> void fun(int); typedef int (*pf) (int, int); int proc(pf, int, int); int main() { int a=3; fun(a); return 0; } void fun(int n) { if(n > 0) { fun(--n); printf("%d,", n); fun(--n); } }
Options- A. 0, 2, 1, 0,
- B. 1, 1, 2, 0,
- C. 0, 1, 0, 2,
- D. 0, 1, 2, 0, Discuss
Correct Answer: 0, 1, 2, 0,
- 7. What will be the output of the program?
#include<stdio.h> int sumdig(int); int main() { int a, b; a = sumdig(123); b = sumdig(123); printf("%d, %d\n", a, b); return 0; } int sumdig(int n) { int s, d; if(n!=0) { d = n%10; n = n/10; s = d+sumdig(n); } else return 0; return s; }
Options- A. 4, 4
- B. 3, 3
- C. 6, 6
- D. 12, 12 Discuss
Correct Answer: 6, 6
- 8. 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);- 9. What do the following declaration signify?
char *arr[10];
Options- A. arr is a array of 10 character pointers.
- B. arr is a array of function pointer.
- C. arr is a array of characters.
- D. arr is a pointer to array of characters. Discuss
Correct Answer: arr is a array of 10 character pointers.
- 10. The macro va_arg is used to extract an argument from the fixed micro argument list and advance the pointer to the next argument.
Options- A. Yes
- B. No Discuss
Correct Answer: No
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- 1. What will be the output of the program?
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