Tuesday, June 12, 2012

Debugging questions in C with answers

Debugging questions in c with answers


C debugging interview questions
C debugging questions with answers


1. Write a c program too shutdown window operating system   in TURBO C.

void main(void)
{
system("shutdown -s");
}
Save the above .Let file name is close.c and compile and execute the above program. Now close the turbo c compiler and open the directory in window you have saved the close.c (default directory c:\tc\bin) and double click its exe file (close.exe).After some time your window will shutdown.
2. Write a scanf statement which can store one line of string which includes white space?
Answer:
void main() {
char a[30];
clrscr();
scanf("%[^\n]",a);
printf("%s",a);
getch();
}
3. Given the string "MATCHMAKING", write a program to read the string from the terminal and display the same in the following formats:
(a) MATCH MAKING
(b) MATCH
MAKING
(c) M.M.
4.  I need it to write a C/C++ program that connects to a MySQL server and displays the global TIMEZONE.
5.  A string (example "I am writing an email") is entered through the keyboard, write a program in C to get its reverse in a column as output i.e.:
email
an
writing
am
Answer:
void main()
{
char str[20];
char *ptr=str,*temp;
int i=0,j;
clrscr();
scanf("%[^\n]",str);
while(*ptr){
i++;
ptr++;
}
for(j=0;j
            if(*ptr==' ')
            {
                  temp=ptr;ptr--;temp++;
                  while((*temp!=' ')&&(*temp!='\0')) {
                       printf("%c",*temp);
                        temp++;
                  }
                  printf("\n");
            }
            else
            {
                  ptr--;
            }
}
while(*ptr!=' ') {
printf("%c",*ptr);
ptr++;
}
getch();
}
6. I want a C program to check whether a string is a palindrome or not where the string to be checked is passed as command line argument during execution.
Answer:
#include
void main(int counter,char**string)
{
char *rev;
char str[15];
int i,j;
clrscr();
strcpy(str,string[1]);
printf("%s",str);
for(i=strlen(str)-1,j=0;i>=0;i--,j++)
rev[j]=str[i];
rev[j]='\0';
if(strcmp(rev,str))
printf("\nThe string is not a palindrome");
else
printf("\nThe string is a palindrome");
getch();
}
7. How to write a c program to display the source code of the program.
Answer:
If source code is available
#include
void main()
{
   char str[70];
   FILE *p;
   clrscr();
   if((p=fopen("mod.c","r"))==NULL)
   {
      printf("\nUnable t open file string.txt");
      exit(1);
   }
   while(fgets(str,70,p)!=NULL)
          puts(str);
   fclose(p);
   getch();
}
8. Swapping of two number without using third variable
Answer:
void main()
{
int a=5,b=10;
clrscr();
//process one
a=b+a;
b=a-b;
a=a-b;
printf("a= %d  b=  %d",a,b);
//process two
a=5;b=10;
a=a+b-(b=a);
printf("\na= %d  b=  %d",a,b);
//process three
a=5;b=10;
a=a^b;
b=a^b;
a=b^a;
printf("\na= %d  b=  %d",a,b);
//process four
a=5;b=10;
a=b-~a-1;
b=a+~b+1;
a=a+~b+1;
printf("\na= %d  b=  %d",a,b);
//process five
a=5,b=10;
a=b+a,b=a-b,a=a-b;
printf("\na= %d  b=  %d",a,b);
getch();
}
9. How to convert decimal to binary in c program?
Answer
void main()
{
  long int m,no=0,a=1;
  int n,rem;
  clrscr();
  printf("Enter any decimal number->");
  scanf("%d",&n);
  m=n;
  while(n!=0)
  {
          rem=n%2;
          no=no+rem*a;
          n=n/2;
          a=a*10;
  }
  printf("The value %ld in binary is->",m);
  printf("%ld",no);
  getch();
}
  
10. Write a program to accept character and integer n from user and display next n character
Answer:
void main()
{
char c;
int n,i;
clrscr();
printf("insert one character and integer : ");
scanf("%c%d",&c,&n);
for(i=c+1;i<=c+n;i++)
printf("%c ",i);
getch();
}
Output:
insert one character and integer : c 4
d e f g
C debugging questions
Debugging questions in c

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