C questions in Linux

C Linux interview questions and answers

(1)What will be output if you will execute following program by

gcc compiler in Linux?

#include<stdio.h>
int main(){
    int a=5;
    printf("%d %d %d",a++,a++,++a);
    return 0;
}

Output:

In LINUX GCC compiler

7 6 8
In TURBO C
7 6 6

Hints: In Turbo c parameter is passed from right to left in printf

function but not in the Linux.


(2)What will be output if you will execute following program by

gcc compiler in Linux?

#include<stdio.h>
int main(){
    int a=5,b=10,c=15,d=20;
    printf("%d %d %d");
        return 0;
}

Output:
In LINUX GCC compiler
Garbage values
In TURBO C
5 10 15

Hints: Local variables stores in the stack.

(3) What will be output if you will execute following program by

gcc compiler in Linux?

#include<stdio.h>
int main(){
    int i=5,j=5,y;
    int x=++i + ++i + ++i;
    y=++j + ++j + ++j;
    printf("%d  %d  %d %d",x,y,i,j);
    return 0;
}

Output:

In LINUX GCC compiler

22  22  8  8
In TURBO C
21  24  8  8

(4) What will be output if you will execute following program by

gcc compiler in Linux?

#include<stdio.h>
int main(){
        int  near *p;
        int  far *q;
        int  huge *r;
        printf("%d  %d  %d",sizeof(p),sizeof(q),sizeof(r));
        return 0;
}

Output:
In LINUX GCC compiler
Compilation error
In TURBO C
2  4  4

Note: In Linux there is not any concept of near, far and huge

pointers

(5) What will be output if you will execute following program by

gcc compiler in Linux?

#include<stdio.h>
int main(){
    char *p;
    int *q;
    float **r;
    printf("%d  %d  %d",sizeof(p),sizeof(q),sizeof(r));
    return 0;
}

Output:

In LINUX GCC compiler

4  4  4
In TURBO C
2  2  2

Hints: size of any type of pointer in Linux is 4 and in turbo c is 2.

(6) What will be output if you will execute following program by

gcc compiler in Linux?

#include<stdio.h>
int main(){
    short int a=5;
    int b=5;
    long int c=5l;
    float d=5.0f;
    double e=5.0;
    long double f=5.0L;
    char g='5';
    printf("Size of short int: %d\n",sizeof(a));
    printf("Size of int: %d\n",sizeof(b));
    printf("Size of long int: %d\n",sizeof(c));
    printf("Size of float: %d\n",sizeof(d));
    printf("Size of double: %d\n",sizeof(e));
    printf("Size of long double: %d\n",sizeof(f));
    printf("Size of char: %d\n",sizeof(g));
        return 0;
}

Output:

In LINUX GCC compiler

Size of short int: 2
Size of int: 4
Size of long int: 4
Size of float: 4
Size of double: 8
Size of long double: 12
Size of char: 1
In TURBO C
Size of short int: 2
Size of int: 2
Size of long int: 4
Size of float: 4
Size of double: 8
Size of long double: 10
Size of char: 1

(7) What will be output if you will execute following program by

gcc compiler in Linux?

#include<stdio.h>
    int main(){
        int a=300;
    char *p=(char *)&a;
        printf("%d\n",*p);
    printf("%d",*++p);
        return 0;
}

Output:

In LINUX GCC compiler

44
1
In TURBO C
44
1

(8) What will be output if you will execute following program by

gcc compiler in Linux?

#include<stdio.h>
int main(){
    char c='A';
    printf("%d   %d",sizeof(c),sizeof('A'));
    return 0;
}

Output:
In LINUX
1  4
In TURBO C
1  2

(9) What will be output if you will execute following program by

gcc compiler in Linux?

#include<stdio.h>
int main(){
    enum color{RED,BLUE,GREEN=-2,YELLOW,PINK};
    printf("%d  %d",BLUE,PINK);
    return 0;
}

Output:

In LINUX GCC compiler

1 0
In TURBO C
1 0

(10) What will be output if you will execute following program by

gcc compiler in Linux?

#include<stdio.h>
int main(){
    char c=127;
    printf("%d",++c);
    printf("  %d",++c);
    return 0;
}

Output:

In LINUX GCC compiler

-128 -127
In TURBO C
-128 -127
Hints: char data type cyclic property.

Data types

Java data type questions and answers with govind 

Java objective type data type questions and answers

(1)What will be the output of following java program?

class Datatype{
     public static void main(String[] args){
          byte num=(byte)130;
          System.out.print(num);
     }
}





Output: -126

(2)What will be the output of following java program?

class Datatype{
     public static void main(String[] args){
          byte num=130;
          System.out.print(num);
     }
}





Output: Compiler error

(3)What will be the output of following java program?

class Datatype{
     public static void main(String[] args){
          byte number=0101;
          System.out.print(number);
     }
}





Output: 65

(4)What will be the output of following java program?

class Datatype{
     public static void main(String[] args){
          short num=0x8fff;
          System.out.print(num);
     }
}







Output: compiler error

(5)What will be the output of following java program?

class Datatype{
     public static void main(String[] args){
          char num=65;
          System.out.println(num);
     }
}





Output: A

(6)What will be the output of following java program?

class Datatype{
     public static void main(String[] args){
          String str="india\0 usa";
          System.out.println(str);
     }
}






Output: India

(7)What will be the output of following java program?

class Datatype{
     public static void main(String[] args){
          String str="india\11usa";
          System.out.println(str);
     }
}




Output: india usa

(8)What will be the output of following java program?

class Datatype{
     public static void main(String[] args){
          String str="india\12usa";
          System.out.println(str);
     }
}





Output:
india
usa

(9)What will be the output of following java program?

class Datatype{
     public static void main(String[] args){
          String str="india\rome";
          System.out.print(str);
     }
}





Output:
india
ome

(10)What will be the output of following java program?

class Datatype{
     public static void main(String[] args){
          String str="japan\taskand";
          System.out.print(str);
     }
}





Output: japan askand

(11)What will be the output of following java program?

class Datatype{
     public static void main(String[] args){
          String str="local\national";
          System.out.print(str);
     }
}






Output:
local
ational

Array in c

Array tutorials in c programming language by examples

An array is derived data type in c programming language which

can store similar type of data in continuous memory location.

Data may be primitive type (int, char, float, double…), address of

union, structure, pointer, function or another array.

Example of array declaration:

int arr[5];
char arr[5];
float arr[5];
long double arr[5];
char * arr[5];
int (arr[])();
double ** arr[5];

Array is useful when:

(a) We have to store large number of data of similar type. If we

have large number of similar kind of variable then it is very

difficult to remember name of all variables and write the

program. For example:

//PROCESS ONE
#include<stdio.h>
int main(){
    int ax=1;
    int b=2;
    int cg=5;
    int dff=7;
    int am=8;
    int raja=0;
    int rani=11;
    int xxx=5;
    int yyy=90;
    int p;
    int q;
    int r;
    int avg;
    avg=(ax+b+cg+dff+am+raja+rani+xxx+yyy+p+q+r)/12;
    printf("%d",avg);

    return 0;      
}
If we will use array then above program can be written as:

//PROCESS TWO
#include<stdio.h>
int main(){
    int arr[]={1,2,5,7,8,0,11,5,50};
    int i,avg;
    for(int i=0;i<12;i++){
         avg=avg+arr[i];
    }
    printf("%d",avg/12);
    return 0;      
}

Question: Write a C program to find out average of 200 integer

number using process one and two.

(b) We want to store large number of data in continuous memory

location. Array always stores data in continuous memory location.

(q) What will be output when you will execute the following

program?

#include<stdio.h>
int main(){
int arr[]={0,10,20,30,40};
    char *ptr=arr;
    arr=arr+2;
    printf("%d",*arr);
    return 0;      
}

Advantage of using array:

1. An array provides singe name .So it easy to remember the

name of all element of an array.

2. Array name gives base address of an array .So with the help

increment operator we can visit one by one all the element of an

array.

3. Array has many application data structure.

Array of pointers in c:

        Array whose content is address of another variable is known

as array pointers.  For example:

#include<stdio.h>
int main(){
float a=0.0f,b=1.0f,c=2.0f;
    float * arr[]={&a,&b,&c};
    b=a+c;
    printf("%f",arr[1]);
    return 0;      
}

Complex arrays in c

1. Declaration of an array of size five which can store address

such functions whose parameter is void data type and return type

is also void data type:


void ( arr[5] )( );

2. Declaration of an array of size five which can store address

such function which has two parameter of int data type and

return type is  float data type:

float ( arr[5] )(int, int);

3. Declaration of an array of size two which can store the address

of printf or sacanf function:

int ( arr[2] )( const char *, … );

Note: prototype of printf function is:  int printf( const char *, … );

Different type of array in c:

(a) Array of integer
    An array which can hold integer data type is known as array of

integer.

(b) Array of character
    An array which can hold character data type is known as array

of character.

(c) Array of union
    An array which can hold address of union data type is known as

union of integer.

For example:

(1) What will be output when you will execute the following

program?

#include<stdio.h>
union A{
char p;
float const * const q;
};
int main(){
    union A arr[10];
    printf("%d",sizeof arr);
   return 0;    
}

Output: 20

(2) What will be output when you will execute the following

program?

#include<stdio.h>
union A{
    char character;
    int ascii;
};
int main(){
    union A arr[2]={{65},{'a'}};
    printf("%c %c",arr[0],arr[1]);
       return 0;    
}

Output: A a

(d) Array of structure
 An array which can hold address of structure data type is known

as array of structure. For example:

(1) What will be output when you will execute the following

program?

#include<stdio.h>
typedef struct stu{
    char * name;
    int roll;
}s;
int main(){
    s arr[2]={{"raja",10},{"rani",11}};
    printf("%s %d",arr[0]);
    return 0;      
}

Output: raja 10

(2) What will be output when you will execute the following

program?

#include<stdio.h>
struct A{
    int p;
    float q;
    long double *r;
};
int main(){
    struct A arr[10];
    printf("%d",sizeof arr);
 
    return 0;      
}

Output: 80

(e) Array of string
    An array which can hold integer data type is known as array of

integer.

(f) Array of array
    An array which can hold address of another array is known as

array of array.

(g) Array of address of integer
    An array which can hold address integer data type is known as

array of address of integer.

Pointer to array

A pointer which holds base address of an array or address of any

element of an array is known as pointer to array. For example:

(a)

#include<stdio.h>
int main(){
    int arr[5]={100,200,300};
    int *ptr1=arr;
    char *ptr2=(char *)arr;
    printf("%d   %d",*(ptr1+2),*(ptr2+4));

       return 0;    
}
Output: 300   44

(b)

#include<stdio.h>
int main(){
    static int a=11,b=22,c=33;
    int * arr[5]={&a,&b,&c};
    int const * const *ptr=&arr[1];
    --ptr;
    printf("%d ",**ptr);
        return 0;      
}

Output: 11

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Core Java with OCJP_SCJP Language Fundamentals Part-2 __ Data Types part-1

Java with Govind  

   

Datatypes

In java every variable has a type, every expression has a type and all types are strictly defined.All the assignments should be checked by the compiler for the type compatibility. Hence java language
considers as strongly typed language.Java is not considered as pure object oriented programming
language because several OOP features(like multiple inheritance, operator overloading) are not supported by java. Even java contains non-object primitive datatypes.

Except boolean and char all the remaining datatypes are signed datatypes i.e we can represent both +ve and –ve numbers.

byte

              Size :  8-bits

             Range:  -128 to 127

-ve numbers can represented in 2’s compliment form.

   Ex:

         byte b = 10;

         byte b = 127;

         byte b = 130; --->  C.E: possible loss of precision

      byte b = true;  ----> C.E: Incompatible types found: boolean

                                                                  required: byte

byte datatype is best suitable if we are handling data either from file or form network.

short

     

Ex:

        short s = 10;

        short s = 32767;

        short s = 65535;---> C.E: possible loss of precision.

        short s = true;   ---->  C.E: Incompatible types

 short is best suitable datatype for 16 -bit process. But currently these are completely  out dated and hence the corresponding datatypes also no one is using.

int

      The most commonly used datatype is int. 

       size = 4 bytes

The size of int is always fixed irrespective of platform hence the chance of failing java program is

very less if u r changing the platform hence the java is considered as Robust.

Core Java with OCJP_SCJP Language Fundamentals Part- 3 __ Data Types part-II

long

       if int is not enough to hold big values then we should go for long-datatype

     

Ex:

The amount of distance traveled by light in 1000days can be represented by long

datatype only and int is not enough.

floating -point

           for representing real numbers(numbers with decimal points)

boolean datatye

         size = not a pplicable(virtual machine dependent).

         range = not applicable but allowed values are true/false

Ex:

int x = 0;

if(x)

{

System.out.println("Hello");

}

else

{

System.out.println("Hai");

}

C.E: Incompatible types found :int

required: boolean.

char

Comparison table for java primitive datatypes