VITTHAL - C Tricky Snippets

main()
{
int i;
clrscr();
printf("%d", &i)+1;
scanf("%d", i)-1;
}

Runtime error. Access violation

Compile error. Illegal syntax

None of the above

Runtime error

main(int argc, char *argv[])
{
(main && argc) ? main(argc-1, NULL) : return 0;
}

Gets into Infinite loop

Compile error. Illegal syntax

None of the above

Runtime error.

main()
{
int i;
float *pf;
pf = (float *)&i;
*pf = 100.00;
printf("n %d", i);
}

Some Integer not 100

100

Runtime error.

None of the above

main()
{
int i = 0xff ;
printf("n%d", i<<2);
}



1020

512

4

1024

#define SQR(x) x * x
main()
{
printf("%d", 225/SQR(15));
}



15

225

1

none of the above

union u
{
struct st
{
       int i : 4;
       int j : 4;
       int k : 4;
       int l;
}st;
int i;
}u;
main()
{
    u.i = 100;
    printf("%d, %d, %d",u.i, u.st.i, u.st.l);
}



40, 4, 0

100, 4, 0

0, 0, 0

4, 4, 0

union u
{
union u
{
int i;
int j;
}a[10];
int b[10];
}u;
main()
{
printf("n%d", sizeof(u));
printf(" %d", sizeof(u.a));
// printf("%d", sizeof(u.a[4].i));
}



None of the Above

1, 100, 1

40, 4, 4

4, 4, 4

A
main() { int i, j, p; i = 25; j = 100; p = &i; // Address of i is assigned to pointer p printf("%f", i/(p) ); // i is divided by pointer p }



Compile error

1.00000

Runtime error.

0.00000

main()
{
int i, j;
scanf("%d %d"+scanf("%d %d", &i, &j));
printf("%d %d", i, j);
}

Compile error

0, 0

Runtime error.

the first two values entered by the user

main()
{
char *p = "hello world";
p[0] = 'H';
printf("%s", p);
}

Compile error

“Hello world”

Runtime error.

“hello world”

main()
{
char * strA;
char * strB = I am OK;
memcpy( strA, strB, 6);
}

Compile error

I am OK

Runtime error.

I am O

How will you print % character?

printf(“%%”)

printf(“\%”)

printf(“%”)

printf(“%%”)

const int perplexed = 2;
#define perplexed 3
main()
{
#ifdef perplexed
#undef perplexed
#define perplexed 4
#endif
printf("%d",perplexed);
}



none of the above

4

2

0

struct Foo
{
char *pName;
};
main()
{
struct Foo *obj = malloc(sizeof(struct Foo));
clrscr();
strcpy(obj->pName,"Your Name");
printf("%s", obj->pName);
}

Name

compile error

Your Name

Runtime error

struct Foo
{
char *pName;
char *pAddress;
};
main()
{
struct Foo *obj = malloc(sizeof(struct Foo));
clrscr();
obj->pName = malloc(100);
obj->pAddress = malloc(100);
strcpy(obj->pName,"Your Name");
strcpy(obj->pAddress, "Your Address");
free(obj);
printf("%s", obj->pName);
printf("%s", obj->pAddress);
}

Your Name Your Name

Your Address, Your Address

Your Name, Your Address

None of the above

main()
{
char *a = "Hello ";
char *b = "World";
clrscr();
printf("%s", strcat(a,b));
}

HelloWorld

Hello World

Hello

None of the above

main()
{
char *a = "Hello ";
char *b = "World";
clrscr();
printf("%s", strcpy(a,b));
}

None of the above

“HelloWorld”

“Hello World”

“Hello”

void func1(int (*a)[10])
{
printf("Ok it works");
}
void func2(int a[][10])
{
printf("Will this work?");
}

main()
{
int a[10][10];
func1(a);
func2(a);
}

Ok it worksWill this work?

Will this work?

Ok it works

None of the above

main()
{
printf("%d, %d", sizeof('c'), sizeof(100));
}



4, 100

2, 100

2, 2

4, 4

main()
{
int i = 100;
clrscr();
printf("%d", sizeof(sizeof(i)));
}



none of the above

4

100

2

main()
{
int c = 5;
printf("%d", main||c);
}



none of the above

0

5

1

main()
{
char c;
int i = 456;
clrscr();
c = i;
printf("%d", c);
}



none of the above

random number

-456

456

void main ()
{
int x = 10;
printf ("x = %d, y = %d", x,--x++);
}



none of the above

10, 11

10, 9

10, 10

main()
{
int i =10, j = 20;
clrscr();
printf("%d, %d, ", j-- , --i);
printf("%d, %d ", j++ , ++i);
}



20, 9, 19, 10

20, 9, 20, 10

20, 10, 20, 10

19, 9, 20, 10

main()
{
int x=5;
clrscr();
for(;x==0;x--) {
printf("x=%dn”", x--);
}
}



none of the above

0, 1, 2, 3, 4

1, 2, 3, 4, 5

4, 3, 2, 1, 0

main()
{
int x=5;
for(;x!=0;x--) {
printf("x=%dn", x--);
}
}



5, 3, 1

4, 3, 2, 1, 0

5, 4, 3, 2,1

none of the above

main()
{
int x=5;
clrscr();
for(;x<= 0;x--)
{
printf("x=%d ", x--);
}
}



5, 3, 1, -1, 3

5, 2, 1

5, 3, 1

None of the above

main()
{
{
unsigned int bit=256;
printf("%d", bit);
}
{
unsigned int bit=512;
printf("%d", bit);
}
}



256, 512

512, 512

256, 256

Compile error

main()
{
int i;
clrscr();
for(i=0;i<5;i++)
{
printf("%dn", 1L << i);
}
}



1, 2, 4, 8, 16

0, 1, 2, 4, 8

0, 1, 2, 3, 4

5, 4, 3, 2, 1

main()
{
signed int bit=512, i=5;
for(;i;i--)
{
printf("%dn", bit = (bit >> (i - (i -1))));
}
}



128, 64, 32, 16, 8

256, 128, 64, 32, 16

512, 256, 128, 64, 32

64, 32, 16, 8, 4

main()
{
signed int bit=512, i=5;
for(;i;i--)
{
printf("%dn", bit >> (i - (i -1)));
}
}



512, 512, 512, 512, 512

256, 256, 0, 0, 0

512, 256, 0, 0, 0

256, 256, 256, 256, 256

main()
{
if (!(1&&0))
{
printf("OK I am done.");
}
else
{
printf("OK I am gone.");
}
}

none of the above

compile error

OK I am gone

OK I am done

main()
{
if ((1||0) && (0||1))
{
printf("OK I am done.");
}
else
{
printf("OK I am gone.");
}
}

none of the above

compile error

OK I am gone

OK I am done

main()
{
signed int bit=512, mBit;
{
mBit = ~bit;
bit = bit & ~bit ;
printf("%d %d", bit, mBit);
}
}



0, -513

512, 0

0, 513

0, 0

What would be the output of the following program?
main()
{
     int i=4;
     switch(i)
     {
          default:
          printf("n A mouse is an elephant built by the Japanese");
          case 1:
               printf(" Breeding rabbits is a hair raising experience");
               break;
          case 2:
               printf("n Friction is a drag");
               break;
          case 3:
               printf("n If practice make perfect, then nobody's perfect");
     }
}

a) A mouse is an elephant built by the Japanese

b) Breeding rabbits is a hare raising experience

c) A mouse is an elephant built by the Japanese Breeding rabbits is a hare raising experience

d) None of the above

What is the output of the following program?

#define SQR(x) (x*x)

main()

{

int a,b=3;

a= SQR(b+2);

printf("%d",a);

}



25

11

Error

Garbage Value

In which line of the following, an error would be reported?
1. #define CIRCUM(R) (3.14*R*R);
2. main()
3. {
4. float r=1.0,c;
5. c= CIRCUM(r);
6. printf("n%f",c);
7. if(CIRCUM(r))==6.28)
8. printf("nGobbledygook");
9. }

Line 1

Line 5

Line 6

Line 7

We should not read after a write to a file without an intervening call to fflush(), fseek() or rewind()

True

False

If the program (myprog) is run from the command line as myprog 1 2 3 , What would be the output?

main(int argc, char *argv[])
{
   int i;
   for(i=0;i<argc;i++)
   printf("%s",argv[i]);
}

1 2 3

C:MYPROG.EXE123

MYP

None of the above

If the following program (myprog) is run from the command line as myprog 1 2 3, What would be the output?

main(int argc, char *argv[])
{
   int i,j=0;
   for(i=0;i<argc;i++)
   j=j+ atoi(argv[i]);
   printf("%d",j);
}



1 2 3

6

error

"123"

If the following program (myprog) is run from the command line as myprog monday tuesday wednesday thursday
What would be the output?

main(int argc, char *argv[])
{
while(--argc >0)
printf("%s",*++argv);
}

myprog monday tuesday wednesday thursday

monday tuesday wednesday thursday

mondaytuesdaywednesdaythursday

myprog tuesday thursday

What would be the output of the following program?

main()
{
int y=128;
const int x=y;
printf("%d",x);
}



128

Garbage value

Error

0

Following declarations are same
const char *s;
char const *s;

True

False

What would be the output of the following program?

main()
{
char near * near *ptr1;
char near * far *ptr2;
char near * huge *ptr3;
printf("%d %d %d",sizeof(ptr1),sizeof(ptr2),sizeof(ptr3));
}



1 1 1

1 2 4

2 4 4

4 4 4

Following declarations are different from one another
const char *const s;
char const *const s;

True

False

If the following program (myprog) is run from the command line as myprog friday tuesday sunday, What would be the output?

main(int argc, char*argv[])
{
printf("%c",**++argv);
}

myprog

friday

If the following program (myprog) is run from the command line as myprog friday tuesday sunday,
What would be the output?

main(int argc, char *argv[])
{
printf("%c",*++argv[1]);
}

Would the following program compile?

main()
{
int a=10,*j;
void *k;
j=k=&a;
j++;
k++;
printf("n%u%u",j,k);
}

Yes

According to ANSI specifications which is the correct way of declaring main() when it receives command line arguments?

main(int argc, char *argv[])

main(argc,argv) int argc; char *argv[];

main() {int argc; char *argv[]; }

None of the above

What would be the output of the following program?
main()
{
const int x=5;
int *ptrx;
ptrx=&x;
*ptrx=10;
printf("%d",x);
}



5

10

Error

Garbage Value

Thank You.. Visit Again