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Q:

What are the basic concepts of object oriented programming?

Answer

It is necessary to understand some of the concepts used extensively in object oriented programming.These include

Objects
Classes
Data abstraction and encapsulation
Inheritance
Polymorphism
Dynamic Binding
Message passing

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Subject: C++

Q:

Swap two variables without using third variable.

Answer

#include<stdio.h>
int main(){
    int a=5,b=10;
    a=b+a;
    b=a-b;
    a=a-b;
    printf("a= %d b= %d",a,b);
}

Workspace

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Subject: Programming

Q:

What will be output when you will execute following c code?

#include <stdio.h>
void main()

{
    int const SIZE = 5;
    int expr;
    double value[SIZE] = { 2.0, 4.0, 6.0, 8.0, 10.0 };
    expr=1|2|3|4;
    printf ( "%f", value[expr] );
}

A) 2.000000	B) 4.000000
C) 8.000000	D) Compilation error

Answer & Explanation Answer: D) Compilation error

Explanation:

Size of any array in c cannot be constantan variable.

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Filed Under: Programming

Q:

What will be output of the following c program ?

#include

int main()

{

int max-val=100;

int min-val=10;

int avg-val;

avg-val =( max-val + min-val ) / 2;

printf( "%d", avg-val );

return 0;

}

A) 55	B) 105
C) 60	D) Compilation error

Answer & Explanation Answer: D) Compilation error

Explanation:

We cannot use special character – in the variable name.
Variable name can have only underscore.

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Filed Under: Programming

Q:

What will output when you compile and run the following code?

#include <stdio.h>
struct student
{

int roll;
int cgpa;
int sgpa[8];

};

void main()
{

struct student s = { 12,8,7,2,5,9 };
int *ptr;
ptr = (int *)&s;
clrscr();
printf( "%d", *(ptr+3) );
getch();

}

A) 8	B) 7
C) 2	D) Compiler error

Answer & Explanation Answer: C) 2

Explanation:

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Filed Under: Programming

Q:

What will be output when you will execute following c code?

#include <stdio.h>
void main()

{
switch(2)

{
case 1L:printf("No");
case 2L:printf("%s","I");
goto Love;
case 3L:printf("Please");
case 4L:Love:printf("Hi");
}
}

A) I	B) IPleaseHi
C) IHi	D) Compilation error

Answer & Explanation Answer: C) IHi

Explanation:

It is possible to write label of goto statement in the case of switch case statement.

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Filed Under: Programming

Q:

What will be output when you will execute following c code?

#include <stdio.h>
enum actor

{
    SeanPenn=5,
    AlPacino=-2,
    GaryOldman,
    EdNorton
};
void main()

{
enum actor a=0;
switch(a)

{
case SeanPenn: printf("Kevin Spacey");
                         break;
case AlPacino: printf("Paul Giamatti");
                         break;
case GaryOldman:printf("Donald Shuterland");
                         break;
case EdNorton: printf("Johnny Depp");
}
}

A) Kevin Spacey	B) Paul Giamatti
C) Donald Shuterland	D) Johnny Depp

Answer & Explanation Answer: D) Johnny Depp

Explanation:

Default value of enum constant
GaryOldman = -2 +1 = -1
And default value of enum constant
EdNorton = -1 + 1 = 0
Note: Case expression can be enum constant.

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Q:

What will be output when you will execute following c code?

#include <stdio.h>
void main()

{
    signed int a = -1;
    unsigned int b = -1u;
    if(a == b)
         printf( "The Lord of the Rings" );
    else
         printf( "American Beauty" );
}

A) The Lord of the Rings	B) American Beauty
C) Compilation error: Cannot compare signed number with unsigned number	D) Warning: Illegal operation

Answer & Explanation Answer: A) The Lord of the Rings

Explanation:

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Filed Under: Programming

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