Online C Programming Test - C Programming Test - Random

Instruction:

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Total number of questions: 20.
Time allotted: 30 minutes.
Each question carries 1 mark; there are no negative marks.
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What will be the output of the program in 16 bit platform (Turbo C under DOS)?

#include<stdio.h>
int main()
{
    extern int i;
    i = 20;
    printf("%d\n", sizeof(i));
    return 0;
}

vary from compiler

Linker Error : Undefined symbol 'i'

[#]

Which of the following cannot be checked in a switch-case statement?

Character

Integer

Float

enum

Your Answer: Option

(Not Answered)

Correct Answer: Option

Explanation:

The switch/case statement in the c language is defined by the language specification to use an int value, so you can not use a float value.


switch( expression )
{
    case constant-expression1:    statements 1;
    case constant-expression2:    statements 2;    
    case constant-expression3:    statements3 ;
    ...
    ...
    default : statements 4;
}

The value of the 'expression' in a switch-case statement must be an integer, char, short, long. Float and double are not allowed.

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[#]

Which of the following is not logical operator?

[#]

Which of the following errors would be reported by the compiler on compiling the program given below?

#include<stdio.h>
int main()
{
    int a = 5;
    switch(a)
    {
	case 1:
	printf("First");

	case 2:
	printf("Second");

	case 3 + 2:
	printf("Third");

	case 5:
	printf("Final");
	break;

    }
    return 0;
}

There is no break statement in each case.

Expression as in case 3 + 2 is not allowed.

Duplicate case case 5:

No error will be reported.

[#]

Which of the following statements are correct about the below program?

#include<stdio.h>
int main()
{
    int i = 0;
    i++;
    if(i <= 5)
    {
        printf("IndiaBIX\n");
        exit(0);
        main();
    }
    return 0;
}

The program prints 'IndiaBIX' 5 times

The program prints 'IndiaBIX' one time

The call to main() after exit() doesn't materialize.

The compiler reports an error since main() cannot call itself.

[#]

Which of the following sentences are correct about a for loop in a C program?

1:	for loop works faster than a while loop.
2:	All things that can be done using a for loop can also be done using a while loop.
3:	for(;;); implements an infinite loop.
4:	for loop can be used if we want statements in a loop get executed at least once.

1, 2

2, 3

2, 3, 4

[#]

Associativity of an operator is either Left to Right or Right to Left.

True

False

[#]

Point out the compile time error in the program given below.

#include<stdio.h>

int main()
{
    int *x;
    *x=100;
    return 0;
}

Error: invalid assignment for x

Error: suspicious pointer conversion

No error

None of above

[#]

What will be the output of the program ?

#include<stdio.h>
#include<string.h>

int main()
{
    printf("%d\n", strlen("123456"));
    return 0;
}

[#]

10.

A structure can be nested inside another structure.

True

False

[#]

11.

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

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

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

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

None of above

[#]

12.

What will be the output of the program (sample.c) given below if it is executed from the command line?
cmd> sample friday tuesday sunday

/* sample.c */
#include<stdio.h>

int main(int argc, char *argv[])
{
    printf("%c", *++argv[2] );
    return 0;
}

[#]

13.

Which of the following statements are FALSE about the below code?

int main(int ac, char *av[])
{
}

ac contains count of arguments supplied at command-line

av[] contains addresses of arguments supplied at a command line

In place of ac and av, argc and argv should be used.

The variables ac and av are always local to main()

[#]

14.

Point out the error in the program.

#include<stdio.h>
const char *fun();

int main()
{
    *fun() = 'A';
    return 0;
}
const char *fun()
{
    return "Hello";
}

Error: RValue required

Error: Lvalue required

Error: fun() returns a pointer const character which cannot be modified

No error

[#]

15.

Point out the error in the program.

#include<stdio.h>
#include<stdlib.h>

union employee
{
    char name[15];
    int age;
    float salary;
};
const union employee e1;

int main()
{
    strcpy(e1.name, "K");
    printf("%s", e1.name);    
    e1.age=85;
    printf("%d", e1.age);
    printf("%f", e1.salary);
    return 0;
}

Error: RValue required

Error: cannot modify const object

Error: LValue required in strcpy

No error

[#]

16.

If malloc() successfully allocates memory it returns the number of bytes it has allocated.

True

False

[#]

17.

Point out the error in the following program.

#include<stdio.h>
#include<stdarg.h>
void varfun(int n, ...);

int main()
{
    varfun(3, 7, -11.2, 0.66);
    return 0;
}
void varfun(int n, ...)
{
    float *ptr;
    int num;
    va_start(ptr, n);
    num = va_arg(ptr, int);
    printf("%d", num);
}

Error: too many parameters

Error: invalid access to list member

Error: ptr must be type of va_list

No error

[#]

18.

Point out the error in the following program.

#include<stdio.h>
#include<stdarg.h>

int main()
{
    void display(char *s, int num1, int num2, ...);
    display("Hello", 4, 2, 12.5, 13.5, 14.5, 44.0);
    return 0;
}
void display(char *s, int num1, int num2, ...)
{
    double c;
    char s;
    va_list ptr;
    va_start(ptr, s);
    c = va_arg(ptr, double);
    printf("%f", c);
}

Error: invalid arguments in function display()

Error: too many parameters

Error: in va_start(ptr, s);

No error

[#]

19.

What will be the output of the program?

#include<stdio.h>

int main()
{
    struct s1
    {
        char *z;
    int i;
    struct s1 *p;
    };
    static struct s1 a[] = {{"Nagpur", 1, a+1} , {"Chennai", 2, a+2} , 
                            {"Bangalore", 3, a} };

    struct s1 *ptr = a;
    printf("%s,", ++(ptr->z));
    printf(" %s,", a[(++ptr)->i].z);
    printf(" %s", a[--(ptr->p->i)].z);
    return 0;
}

Nagpur, Chennai, Bangalore

agpur, hennai, angalore

agpur, Chennai, angalore

agpur, Bangalore, Bangalore

[#]

20.

Function can return a floating point number.

True

False

[#]

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