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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);
}

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Subject: Programming

Q:

Why we use do-while loop in c?

Answer

It is also called as post tested loop. It is used when it is necessary to execute the loop at least one time. Syntax:

do {
Loop body
} while (Expression);

Example:

int main(){
    int num,i=0;
    do{
         printf("To enter press 1\n");
         printf("To exit press 2");
         scanf("%d",&num);
         ++i;
         switch(num){
             case 1:printf("You are welcome\n");break;
             default : exit(0);
         }
    }
    while(i<=10);
    return 0;
}

Output: 3 3 4 4

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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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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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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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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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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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