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- Question
Point out the error, if any, in the following program. #include "stdio.h" main() { unsigned char; FILE *fp; fp = fopen ("trail", "r"); while (( ch = getc (fp)) ! = EOF) printf ("%c", ch); fclose (fp); }
- Correct Answer
- EOF has been defined as #define EOF -1 n the file "stdioh" and an unsigned char ranges from 0 to 255 hence when EOF is read from the file it cannot be accommodated in ch Solution is to declare ch as an int
- 1. How would you find the length of each string in the following Program? main() { char *str[] = { "Frogs", "Do", "Not" , "Die" , "They" , "Croak!"}; printf ("%d%d", sizeof (str), sizeof (str[0])); } Discuss
- 2. What would be the output of the following program? main() { char a[] = "Visual C++"; char *b = "Visual C++"; printf ("\n%d %d", sizeof (a), sizeof (b)); printf ("\n%d %d", sizeof (*a), sizeof (*b)); } Discuss
- 3. What will be output of following program? #include
int main() { void (*p)(); int (*q)(); int (*r)(); p = clrscr; q = getch; r = puts; (*p)(); (*r)("www.curioustab.com"); (*q)(); return 0; }
Options- A. NULL
- B. www.curioustab.com
- C. Compilation error
- D. None of above Discuss
- 4. What value does read() return when it has reached the end of a file?
Options- A. 1
- B. -1
- C. 0
- D. None Discuss
- 5. Convert the expression ((A + B) * C ? (D ? E) ^ (F + G)) to equivalent Prefix Notation Discuss
- 6. Point out the error, if any, in the following program. #include "stdarg.h" main() { display ( 4, 12.5, 13.5, 14.5, 44.3); } display(int num, ...) { float c; int j; va_list ptr; va_start (ptr, num); for ( j = 1; j <= num; j++) { c = va_arg ( ptr, float ); printf ("\n%f", c); } } Discuss
- 7. What would be the output of the following program? main() { char huge * near * far *ptr1; char near * far * huge *ptr2; char far * huge * near *ptr3; printf ("%d%d%d", sizeof (ptr1), sizeof (ptr2), sizeof (ptr3)); } Discuss
- 8. How would you use the function memmove()? Discuss
- 9. What will be output of following program ? #include int main() { int a = 10; void *p = &a; int *ptr = p; printf("%u",*ptr); return 0; }
Options- A. 10
- B. Address
- C. 2
- D. Compilation error Discuss
- 10. What will output when you compile and run the following code? #include
struct student { int roll; int cgpa; int sgpa[8]; }; void main() { struct student s = { 12,8,7,2,5,9 }; int *ptr; ptr = (int *)&s; clrscr(); printf( "%d", *(ptr+3) ); getch(); }
Options- A. 8
- B. 7
- C. 2
- D. Compiler error Discuss
Programming problems
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Correct Answer: main() { char *str[] = { "Frogs", "Do", "Not", "Die" , "They", "Croak!" }; int i; for ( i = 0;i<=5;i++) printf ("\n%s%d", str[i], strlen( str[i])); }
Correct Answer: 11 2 1 1
Correct Answer: www.curioustab.com
Explanation:
p is pointer to function whose parameter is void and return type is also void. r and q is pointer to function whose parameter is void and return type is int . So they can hold the address of such function.
Correct Answer: -1
Explanation:
It returns -1
Correct Answer: Prefix Notation: ^ - * +ABC - DE + FG
Correct Answer: While extracting a float argument using va_arg we should have useed c = va_arg (ptr, double)
Correct Answer: 4 4 2
Correct Answer: #include "memh" #include "alloch" main() { int area; char *dest; char src[] = "Life is the camera and you are the target" "so keep smiling always"; area = sizeof (src); dest = malloc (area); memmove (dest, src, area); printf("\n%s", dest); printf("\n%s",src); }
Correct Answer: 10
Explanation:
Void pointer can hold address of any data type without type casting. Any pointer can hold void pointer without type casting.
Correct Answer: 2
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