Point out the error in the following program. #include<stdio.h> #include<stdarg.

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Question

Point out the error in the following program.

#include<stdio.h>
#include<stdarg.h>
void varfun(int n, ...);

int main()
{
    varfun(3, 7, -11, 0);
    return 0;
}
void varfun(int n, ...)
{
    va_list ptr;
    int num;
    num = va_arg(ptr, int);
    printf("%d", num);
}

Options
A. Error: ptr has to be set at begining
B. Error: ptr must be type of va_list
C. Error: invalid access to list member
D. No error

Correct Answer

Error: ptr has to be set at begining

Explanation

Using va_start(ptr, int);

More questions

1. Bitwise | can be used to set a bit in number.
Options
A. Yes
B. No

Discuss

Correct Answer: Yes

2. Can we have an array of bit fields?
Options
A. Yes
B. No

Discuss

Correct Answer: No

3. By default structure variable will be of auto storage class
Options
A. Yes
B. No

Discuss

Correct Answer: Yes

4. Bitwise can be used to reverse a sign of a number.
Options
A. Yes
B. No

Discuss

Correct Answer: No

5. 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

6. Bitwise can be used to generate a random number.
Options
A. Yes
B. No

Discuss

Correct Answer: No

7. A function that receives variable number of arguments should use va_arg() to extract the last argument from the variable argument list.
Options
A. True
B. False

Discuss

Correct Answer: False

8. Bitwise & can be used to check if more than one bit in a number is on.
Options
A. True
B. False

Discuss

Correct Answer: True

9. The preprocessor can trap simple errors like missing declarations, nested comments or mismatch of braces.
Options
A. True
B. False

Discuss

Correct Answer: False

Explanation:

False, the preprocessor cannot trap the errors, it only replaces the macro with the given expression. But the compiler will detect errors.

10. It is necessary that a header files should have a .h extension?
Options
A. Yes
B. No

Discuss

Correct Answer: No

Explanation:

No, the header files have any kind of extension.

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CuriousTab

Discussion

Point out the error in the following program.
#include<stdio.h> #include<stdarg.h> void varfun(int n, ...); int main() { varfun(3, 7, -11, 0); return 0; } void varfun(int n, ...) { va_list ptr; int num; num = va_arg(ptr, int); printf("%d", num); }

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Discussion

Point out the error in the following program. #include<stdio.h> #include<stdarg.h> void varfun(int n, ...); int main() { varfun(3, 7, -11, 0); return 0; } void varfun(int n, ...) { va_list ptr; int num; num = va_arg(ptr, int); printf("%d", num); }

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Point out the error in the following program.
#include<stdio.h> #include<stdarg.h> void varfun(int n, ...); int main() { varfun(3, 7, -11, 0); return 0; } void varfun(int n, ...) { va_list ptr; int num; num = va_arg(ptr, int); printf("%d", num); }