Q: Which error are you likely to get when you run the following program? main() { struct emp { char name[20]; float sal; }; struct emp e[10]; int i; for ( i = 0 ; i <= 9; i++) scanf ( "%s %f" , e[i].name, &e[i].sal ); }

Floating point formats not linked

Q: There is a mistake in the following code. Add a statement in it to remove it. main() { int a; a = f (10, 3.14) ; printf ( " %d ", a ); } f (int aa, float bb) { return ( ( float ) aa + bb ); }

Add the following function prototype in main (): float f ( int, float );

Question 1

What is the output of this C code? #include void m() { printf("hi"); } void main() { m(); }

Accepted Answer

hi

Question 2

The output of the code below is #include int *m() { int *p = 5; return p; } void main() { int *k = m(); printf("%d", k); }

Accepted Answer

5

Question 3

What would be the output of the following program? main() { extern int i; i = 20; printf( "%d", sizeof(i) ); }

Accepted Answer

extern int i is a declaration and not a definition, hence Error occured

Question 4

What is the difference between the following declarations? extern int fun(); int fun();

Accepted Answer

There is no difference except for the fact that the first one gives a hint that the function fun() is probably in another source file

Question 5

Point out the error, if any, in the following program. main() { int ( *p )() = fun; ( *P ) (); } fun () { Printf ( "
Loud and clear" ); }

Accepted Answer

Here we are initalising the function pointer p to the address of the function fun() But during this initialisation the function has not been defined Hence an error To eliminate this error add the prototype of the fun() before declaration of p, as shown below: extern int fun(); or simply int fun();

Question 6

Point out the error, if any, in the while loop. main() { int i = 1; while () { printf ( "%d", i++); if (i >10) break ; } }

Accepted Answer

The condition in the while loop is a must

Question 7

Point out the error, if any, in the following program. main() { int i = 4, j = 2; switch(i) { case 1 : printf (''
 To err is human, to forgive is against company policy."); break; case j : printf (''
 if you have nothing to do, don't do it here.")…

Accepted Answer

Constant expression required in the second case, we cannot use j

Question 8

What would be the output of the following program? main() { static int a[20]; int i = 0; a[i] = i++; printf ("
%d%d%d", a[0], a[1], i); }

Accepted Answer

0 0 1 That's what some of the compilers would give But some other compiler may give a different answer The reason is, when a single expression causes the same object to be modified and then inspected the behaviour is undefined

Question 9

What would be the output of the following program? main() { int i=2 ; printf ("
%d%d", ++i, ++i ); }

Accepted Answer

Output may vary from compiler to compiler The order of evaluation of the arguments to a function call is unspecified

Question 10

In the following code in which order the functions would be called? a = ( f1 ( 23,14 ) * f2 ( 12/4) ) + f3() ;

Accepted Answer

The order may vary from compiler to compiler Here the multiplication will happen before the addition , but in which order the functions would be called is undefined In an arithmetic expression the parentheses tell the compiler which operands go with which operators but do not force the compiler to evaluate everything within the parentheses first

Question 11

Which error are you likely to get when you run the following program? main() { struct emp { char name[20]; float sal; }; struct emp e[10]; int i; for ( i = 0 ; i <= 9; i++) scanf ( "%s %f" , e[i].name, &e[i].sal ); }

Accepted Answer

Floating point formats not linked

Question 12

What would be the output of the following program? main() { printf (" %d%d%d ", sizeof (3.14f), sizeof (3.14), sizeof (3. 141); }

Accepted Answer

4 8 10

Question 13

What would be the output of the following program? main() { float a = 0.7; if ( a < 0.7f ) printf ( " C "); else Printf ( " C++ "); }

Accepted Answer

C++

Question 14

There is a mistake in the following code. Add a statement in it to remove it. main() { int a; a = f (10, 3.14) ; printf ( " %d ", a ); } f (int aa, float bb) { return ( ( float ) aa + bb ); }

Accepted Answer

Add the following function prototype in main (): float f ( int, float );

Question 15

Point out the error, if any, in the following program. main() { int a = 10; void f(); a = f(); printf ( "
 %d", a ); } void f() { printf ( "
 Hi "); }

Accepted Answer

In spite of defining the function f() as returning void, the program is trying to collect the value returned by f() in the variable a

Question 16

Will the following function work? f1 ( int a, int b ) { return ( f2 (20) ); } f2 ( int a ) { return ( a * a ); }

Accepted Answer

Yes

Question 17

Indicate what would the SWAP macro be expanded to on preprocessing. Would the code compile? #define SWAP (a, b, c ) (c t; t = a, a = b, b = t; ) main() { int x = 10, y = 20; SWAP (x, y, int ); printf ( " %d%d ", x, y); }

Accepted Answer

( int t ; t = a, a = b, b = t ;); This code won't compile since declaration of t cannot occur within parentheses

Question 18

What would be the output of the following program assuming that the array beigns at location 1002? main() { int a[3][4] = { 1 , 2 , 3 , 4 5, 6 , 7, 8 9, 10 , 11, 12 }; Printf ("
%u %u %u", a[0] + 1, *( a[0] + 1), *( *(a + 0) + 1) ); }

Accepted Answer

1004 2 2

Question 19

Undefined reference to 'pthread_create' How to Fix this error?

Accepted Answer

This is a common error while compiling C program in Linux This error occurs when you are using pthread_create function to create threads in your programs To fix this problem ensure following points: Include header file pthreadh in your program Add –lpthread linker flag with compilation command 1- Include Header file #include #include 2- Compile command gcc mainc -o main -lpthread

Question 20

In HTML, ___________ tag is used to construct drop-down list boxes and scrolling list boxes.

Accepted Answer

Programming Questions