Declarations And Initializations

Which of the following correctly represents a long double constant?

A:

6.68

B:

6.68L

C:

6.68f

D:

6.68LF

Answer: B

6.68 is double.
6.68L is long double constant.
6.68f is float constant.
6.68LF is not allowed in c.

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Which of the following operations are INCORRECT?

A:

int i = 35; i = i%5;

B:

short int j = 255; j = j;

C:

long int k = 365L; k = k;

D:

float a = 3.14; a = a%3;

Answer: D

float a = 3.14; a = a%3; gives "Illegal use of floating point" error.

The modulus (%) operator can only be used on integer types. We have to use fmod() function in math.h for float values.

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Which of the declaration is correct?

A:

int length;

B:

char int;

C:

int long;

D:

float double;

Answer: A

int length; denotes that variable length is int(integer) data type.

char int; here int is a keyword cannot be used a variable name.

int long; here long is a keyword cannot be used a variable name.

float double; here double is a keyword cannot be used a variable name.

So, the answer is int length;(Option A).

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Point out the error in the following program.

#include<stdio.h>
int main()
{
    int (*p)() = fun;
    (*p)();
    return 0;
}
int fun()
{
    printf("ExamAdept.com\n");
    return 0;
}

A:

Error: in int(*p)() = fun;

B:

Error: fun() prototype not defined

C:

No error

D:

None of these

Answer: B

The compiler will not know that the function int fun() exists. So we have to define the function prototype of int fun();
To overcome this error, see the below program


#include<stdio.h>
int fun(); /* function prototype */

int main()
{
    int (*p)() = fun;
    (*p)();
    return 0;
}
int fun()
{
    printf("ExamAdept.com\n");
    return 0;
}

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Which of the following is correct about err used in the declaration given below?

 typedef enum error { warning, test, exception } err;

A:

It is a typedef for enum error.

B:

It is a variable of type enum error.

C:

The statement is erroneous.

D:

It is a structure.

Answer: A

A typedef gives a new name to an existing data type.
So err is a new name for enum error.

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Questions for: Declarations And Initializations