VIRTUOSO
Sharp Thoughts
BYTE A BUG
[C DEBUGGING]
1. void main()
{
static int a[10],i;
for(i=0;i<=10;i++)
{
a[i]=0;
printf("%d",a[i]);
}
}
a) 00000 b) 000000000 c) infinite 0's d) Run time Error
2. void abc();
int *ptr;
void main()
{
int i,*p=&i;
abc();
}
void abc()
{
int i=0;
ptr=&i;
ptr++; *ptr=0;
printf("\nHAI %d",i);
}
a) HAI 0 b) HAI 1 c) No output d) Error
3. int a=3,*ptr=&a,aaa=100;
void main()
{
int *p=&aaa;
--p; *p=0;
printf("%d %d %d",*p,*ptr,a);
}
a) 0 0 0 b) 0 3 3 c) 0 0 3 d) Error
4. void main()
{
union a
{
int b;
struct c
{
char i,j;
}ch;
};
union a obj1;
obj1.b=255;
printf("%d %d",obj1.ch.i,obj1.ch.j);
}
a) 0 255 b) 255 0 c) -1 0 d) Error
5 . main()
{
float f=9.99; char d[10]="'wrong'";
printf("\t%d",printf("\n\\float!!!"));
printf("\t%d",printf("\n%f",f));
printf("\t%d",printf("\n%s",d));
}
a) \float!!! 10 b) 12 \float!!!
9.990000 9 4 9.990000
'wrong' 8 8 'wrong'
c) \float!!! 12 d) None of the above
9.990000 4
'wrong' 8
6. #define sqr(x) ++x * ++x
void main()
{
int i=3,t;
t=++i * ++i; i-=2;
printf("%d %d",sqr(i),t);
}
a) 25 25 b) 9 9 c) 20 25 d) 25 9
7. void main()
{
printf("HELLO\xD");
printf("KCT");
}
a) HELLO\xDKCT b) HELLODKCT c) HELLO13KCT d) KCTLO
8. void main(void)
{
char ch[10],*ch1;
printf("%x %x\n",ch,&ch);
printf("%x %x",ch1,&ch1);
}
//Assume A,B,C,D are different addresses
a) A B b) A A c) A A d) A B
C D C C C D C C
9. void main()
{
int i,j;
for(i=1,j=1;i<=5,j<=10;i++,j++)
printf("%d %d",i,j);
}
a) Prints natural numbers twice till 5 b) Prints natural numbers twice till 10
c) Prints natural numbers till 5 d) Error
10. void main()
{
int i=10,j=20;
printf("%d %d %d %d;"); printf("%d; %d");
}
a) 20 10 0 344;20;20 b) junk values
c) 20 10 20 10; 20; 10 d) 20 20 20 20;20;20
11. main()
{
int i; char a[]="\0";
if(printf("%s",a)) printf("null is null");
else printf("null is not null");
}
a) null is null b) Compile error:Non portable pointer conversion
c) null is not null d) Compile error:Invalid assignment to a
12. void main()
{
char ch[20]="abcdefghijklm";
printf("\n%5.2s",ch);
}
a) abcd b) abcdefghijklm c) abcdefghijklm d) ab
13. main()
{
int i=1,j=1;
for(;j;printf("%d %d\n",i,j))
j=i++<=5;
}
a) 1 1 b) 2 1 c) 2 1 d) Error
2 1 3 1 3 1
3 1 4 1 4 1
4 1 5 1 5 1
5 0 6 0 6 1
7 0
14. /* If this program is executed in Borland C++, Then what will be the output? */
void main()
{
char *a;
char *b,*c;
clrscr();
strcpy(a,"123");
b=_fstrdup(a);
strcpy(c,a);
printf("%s\n%s",b,c);
printf("%s",4);
}
15. /* What does the program do? */
main()
{
int kb;
while(1)
{
if(inportb(0x60)==68) break;
kb=peek(0x0040,0x001A);
poke(0x0040,0x001C,kb);
}
}
16. void main()
{
float x; double y = 1.5e-38;
x = y;
printf("\n\nStatus 87 after error: %X\n", _status87());
}
a) Error b) 20 c) 1.5e-38 d) 30
17. extern unsigned _stklen = 543210U;
void main()
{
printf("\nThe stack length is %u\n", _stklen);
}
a) 18922 b) 23678 c) 1 d) 543210
18. main()
{
int a(int),n=10;
a(n);
}
int a(int n)
{
int i;
for(i=0;i<=n;i++)
a(n-i);
printf("\nKCT");
}
a) KCT b) KCTKCTKCTKCTKCTKCTKCTKCTKCTKCT
c) infinite loop d) KCTKCT...........
19. char src[15] = "rtiaingn s";
char target[15];
void main()
{
swab(src,target,strlen(src));
printf ("This is target: %s\n", src);
}
What is the output of the above program?
20. int sort(const void *a, const void *b); char arr[5][4] = {"cat", "cart", "cab", "cap", "can" };
void main()
{
int i;
qsort((void *)arr, 5, sizeof(arr[0]), sort);
for (i = 0; i < 5; i++)
printf("%s\n",arr[i]);
}
int sort(const void *p, const void *q)
{
return(strcmp((char *)p,(char *)q));
}
a) cab b) cab c) cab d) None of the above
can can can
cap cap cap
cartcat cart car
cat cat cat
21. main()
{
char a=0xAA;
int b;
b=(int)a;
b=b>>4;
printf("%x",b);
}
a) fffa b) error c) 762e d) d5ec
22. enum mode = {green,red,orange,blue,white};
main ()
{
green = green + 1;
printf("%d,%d",green,red );
}
a) 1,1 b) 0,1
c) No output, error in compilation d) None of the above
23. char *c[] ={
"FILE",
"EDIT",
"SEARCH",
"COMPILE",
};
char **cp[] = {c+3,c+2,c+1,c},***cpp = cp;
main()
{
printf("%s", **cpp);
printf("%s"< *--*++cpp+3);
printf("%s", *cpp[-2]+3);
printf("%s\n",cpp[-1][-1]+1);
}
a) SEARCHFILEEDITCOMPILE b) SEARCHCOMPILEEDIT
c) SEARCHEPILEDIT d) None of the above
24. main()
{
int a=1; b=2; c=3; *ptr;
ptr =&c;
a=c /*ptr;
b=c;
printf("a=%d b=%d",a,b);
}
a) a=1 b=3 b) a=3 b=3 c) 3 2 d) Error
25. main()
{
char *p="Virtuoso%s";
printf(p);
}
a) Virtuoso%s b) Virtuoso
c) VirtuosoVirtuoso%s d) Blank Screen
26. main()
{
printf("%d",call());
}
call()
{
_AH=1;
return;
}
a) 0 b) 1 c) <junk> d) 256
27. # define loop while(1)
main()
{
loop; printf("DONE");
}
a) DONE b) DONE...... c) infinite loop d) Error
28. void main()
{
float a,b,c,d,d1,d2;
d=sqrt(b*b-4*a*c);
scanf(%d%d%d,a,b,c);
d1=(-b+d)/(2*a); d2=(-b-d)/(2*a);
printf(%d %d,d1,d2);
}
If 1,1,1 are inputs, then what will be the output?
a) Compiler Error b) Linker Error c) Domain Error d) None of the above
29. void main()
{
typedef struct student
{
char name[20];
float sal;
int no;
void input()
{ printf("%d",sal); }
}Welcome;
Welcome *p;
Welcome come={"Kumaraguru College Of Technology",1888.98,23};
p=&come;
printf("%s %f %d\n",come.name,come.sal,come.no);
printf("%s %f %d",p[1].name,0[p].sal,p->no);
}
a) Kumaraguru College Of Technology 1888.98 23
Kumaraguru College Of Technology 1888.98 23
b) Kumaraguru College Of Technology 1888.98 23
<junk> <junk> 23
c) Kumaraguru College Of Technology 1888.979980 23
<junk> <junk> 23
d) Kumaraguru College Of Technology 1888.979980 23
1888.979980 23
30. void main()
{
int a,b;
(char)(a)=a >> b << ~a;
printf( d %d",a,b);
}
If the junk values of a and b are X & Y respectively, Then what will be the output ?
a) X Y b) Y X c) 0 X d) None of the above
31. void main()
{
int a=2,b=7,c;
c= b << a;
b=c*(b*(++a)--);
a=a >> b;
printf("%c",b);
}
a) R b) k c) L d) <junk>
32. void main()
{
FILE *fp; char ch;
fp=fopen("C:\\temp.txt","r");
if(fp==NULL) printf("ERROR");
while(ch!=EOF)
{
ch=getc(fp);
printf("%c",ch);
}
fclose(fp);
unlink("C:\\temp.txt");
}
a) Displays the content of the file and frees its associated memory
b) Displays the content of the file and deallocates its reference
c) Displays the content of the file and deletes the file
d) Error
33. void main()
{
printf("\n%d",3.00);
}
a) 3 b) 3.00 c) 3.000000 d) Depends on the compiler
34. void main()
{
char *name;
name = getpass("Enter The String:");
cprintf("String:%s\r\n",name);
}
a) Gets the system password and compares with the supplied password
b) Gets a password from the user by echoing * and displays it
c) Gets a password from the user by without echoing it and displays it
d) Error
35. #define MAX(x,y) ((x)>(y))?(x):(y)
main()
{
int x=5,y=5;
printf("maximum is %d",MAX(++x,++y));
}
a) maximum is 7 b) maximum is 5 c) maximum is 6 d) none of the above
36. void main()
{
char ch1,ch2;
if (ch1 = getch()) ungetch(ch1);
ch2=getch();
printf("%c",ch2);
}
If the input is a & b,Then what is the output?
a) a b) b c) Junk value d) Error
37. int i=1;
void subroutine(jmp_buf);
void main()
{
int value=0;
jmp_buf jump;
value = setjmp(jump);
printf("Longjmp with value %d\n", value);
if (!i) exit(0);
printf("About to call subroutine ... \n");
subroutine(jump);
}
void subroutine(jmp_buf jumper)
{
longjmp(jumper,i--);
}
a) Longjmp with value 0 b) Longjmp with value 0
About to call subroutine ... About to call subroutine ...
Longjmp with value 0 Longjmp with value 1
About to call subroutine ... About to call subroutine ...
c) Infinite Loop d) None of the above
38. void main()
{
int i=100,j=20;
i++=j;
i*=j;
printf("%d\t%d\n",i,j);
}
a) 400,20 b) 2420,20 c) 2020,20 d) Lvalue required
39. void main()
{
#define STDOUT 1
int nul, oldstdout;
char msg[] = "VIRTUOSO";
nul = open("virtuoso.txt",O_CREAT | O_RDWR,S_IREAD | S_IWRITE);
oldstdout = dup(STDOUT);
dup2(nul, STDOUT);
close(nul);
write(STDOUT, msg, strlen(msg));
dup2(oldstdout, STDOUT);
close(oldstdout);
}
a) Redirects to the standard output given file
b) Creates a duplicate handle for controlling the display on the screen
c) Duplicates the standard output and store it in the given file
d) Error
40. void main()
{
printf("%d",MAXSHORT);
}
a) 255 b) 16383 c) 32767 d) 65535
41. void main()
{
cprintf("KUMARAGURU COLLEGE OF TECHNOLOGY\r\n");
cprintf("CSE DEPARTMENT\r\nVIRTUOSO\r\n");
gotoxy(1, 3);
insline();
}
a) VIRTUOSORTMENTLEGE OF TECHNOLOGY
b) KUMARAGURU COLLEGE OF TECHNOLOGY
CSE DEPARTMENT
VIRTUOSO
c) KUM
ARAGURU COLLEGE OF TECHNOLOGY
CSE DEPARTMENT
VIRTUOSO
d) Error
42. main()
{
int rows=3,colums=4, i,j,k;
int a[rows][colums]={1,2,3,4,5,6,7,8,9,10,11,12};
i=j=k=99;
for(i=0;i<rows;i++)
for(j=0;j<colums;j++)
if(a[k][j]<k)
k=a[i][j];
printf("%d\n",k);
}
a) 10 b) 7 c) 256 d) Error
43. void main()
{
char as[]="\\0\0"; int i=0;
do{
switch(as[i++])
{
case '\\': printf("A");
case 0: printf("B");
default: printf("C");break;
}
}while(i<3);
}
a) ABCBCC b) CCBC c) ABCCBC d) ABCBCC
44. typedef static int si;
void main()
{
si i=2,j=1,k=0,t;
t=++k||--j&&i--;
printf("%d %d %d %d",i,j,k,t);
printf("%d",!!i);
}
a) 1 0 1 1 2 b) 2 1 1 0 2 c) 2 1 1 1 1 d) Error
45. double dbl=20.4530,d=4.5710,dblvar3;
void main() {
double dbln(void);
dblvar3=dbln();
printf("%.2f,%.2f,%.2f\n",dbl,d,dblvar3);
}
double dbln(void)
{
double dblvar3;
dbl=dblvar3=4.5;
return(dbl+d+dblvar3);
}
a) 4.50,4.57,13.57 b) 4.50,4.57,9.07
c) 4.50,4.57,13.60 d) 4.50,4.60,13.60
46. struct ITEM {
int key, value;
};
void additem(struct ITEM *itemptr)
{
assert(itemptr == NULL);
}
void main()
{
struct ITEM *ptr;
ptr->key=1;
ptr->value=1;
additem(ptr);
}
a) 1 b) Add an item to the given list
c) Checks whether the given item is in the list or not d) Error
47. typedef struct a
{
int x;
aType *b;
}aType;
void main() {
aType gg;
gg.x=10;
gg.b=NULL;
printf("%d %u",gg.x,gg.b);
}
a) 10 0 b) 0 10 c) 10 d) Compiler error
48. main()
{
int i,n;
char *str="girl";
n=strlen(str);
*str=str[n];
for(i=0;i<n;++i)
{
printf("%s;",str);
str++;
}
}
a) ;irl;rl;l; b) girl;irl;rl;l; c) Runtime error:Null pointer assignment d) junk values
49. void main(void)
{
char ************a;
printf("\n%u %d", a, sizeof(char huge*near*));
}
a) <junk> 4 b) 4 c) 0 2 d) compiler error
50. void main()
{
char name[13];
printf("%s", tmpnam(name));
}
a) Displays a name which can be used for as a variable name in the program without any conflict
b) Displays a name which can be used for as a Temporary value of a string variable in
the program without any conflict
c) Displays a name which can be used for as a Temporary name of a file in the current directory
without any conflict
d) Linking error:Undefined symbol _tmpname in module c:\fn.c
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