Girfa : Student Help

Friday 9 June 2017

C Language NIELIT Exam Paper Solution

NIELIT O Level

C Language Paper Answer

January - 2015

1: Objective

1.1 B
1.2 : C
1.3 : D
Explanation : Because pointer is not being part of any equation so option a and d is equal.
1.4 : D

Raj Kumar

A programmer and Founder of Girfa IT Services, working from 2009.At Starting computer teaching was my full-time job but after 10 years of teaching I chose to programming as a full-time job and teaching become part-time. In real life, I am very lazy and I made it my coding style I always try to make a reusable component that’s my USP for programming which saves my time and extra working both.

Write a C program to modify the constant variable.

Q : Write a C program to modify the constant variable.

Solution :

#include<stdio.h>

void main()

{

const int a=1;

int *p;

Raj Kumar

Thursday 8 June 2017

What is automatic type promotion in c

Q : In the following declaration statement:

char c=’A’;
Variable c stores one byte of memory space while character constants ‘A’ stores one byte memory space. How one byte variables can stores two byte character constant? What is automatic type promotion in c?

Solution :

Character constant reserve two byte of memory space to represent octal or hexadecimal character constant but char variable stores only its one byte ASCII value.

In C language, char type is used to store a 1 byte integer. When you assign 'A' to char c, you are not assigning the letter A itself into memory. Rather, you are assigning the number (integer) representing the A character. Each letter has a digit that represent it. . Remember that unlike humans, computers cannot understand letters. That's why we need a way to translate them into digits. To do this we use differnet coding styles like: ASCII, UTF-8, etc If your machine use ASCII coding then the value assigned to char c would be 65 (0x41 hex). As you may notice, 0x41 is one byte and can be stored in your char variable.

Automatic type promotion

Some data types like char , short int take less number of bytes than int, these data types are automatically promoted to int or unsigned int when an operation is performed on them. This is called integer promotion. For example no arithmetic calculation happens on smaller types like char, short and enum. They are first converted to int or unsigned int, and then arithmetic is done on them. If an int can represent all values of the original type, the value is converted to an int . Otherwise, it is converted to an unsigned int.

int main()

{

char a = 30, b = 40, c = 10;

char d = (a * b) / c;

printf ("%d ", d);

return 0;

}

At first look, the expression (a*b)/c seems to cause arithmetic overflow because signed characters can have values only from -128 to 127 (in most of the C compilers), and the value of subexpression ‘(a*b)’ is 1200 which is greater than 128. But integer promotion happens here in arithmetic done on char types and we get the appropriate result without any overflow.

Consider the following program as another example.

Next Question

Raj Kumar

Text File Input Through C Language

Q : Write a C program to write a line of string in a text file.

Solution :

#include<stdio.h>

void main()

{

FILE *pt;

char ch[100],c;

int i;

pt=fopen("test.txt","w");

Raj Kumar

Monday 5 June 2017

Gridview FIll VB.net

Dynamic fill data gridview using VB.net

Public Sub fill_gridview(ByRef dt As DataGridView, ByVal sql As String)

Dim con As New OleDbConnection(getconstr)

Dim da As New OleDbDataAdapter(sql, con)

Dim ds As New DataSet

Try

Raj Kumar

Saturday 3 June 2017

Division Flipper Using CSS

Girfa

Student Help

Full Code :

<html>

<head>

<title>Girfa : Flip Effect </title>

<style>

.flip-container {

perspective: 500px;

}

/* flip the pane when hovered */

.flip-container:hover .flipper, .flip-container.hover .flipper {

transform: rotateY(180deg);

Raj Kumar

Friday 2 June 2017

Write a C program that displays the recommended actions depending on the color of a traffic light using the switch statement.

Q : Write a C program that displays the recommended actions depending on the color of a traffic light using the switch statement.

Solution :

void main (void)

{

char colour;

Raj Kumar

Thursday 1 June 2017

Define void data type and write any three use of it.

Q : Define void data type and write any three use of it.

The data type void actually refers to an object that does not have a value of any type. Void is also used to indicate when a function does not return a value or no argument. Such a function is used for its side effect and not for its value. In the function declaration and definition, we have indicated that the function does not return a value by using the data type void to show an empty type, i.e. no value. Similarly, when a function has no formal parameters, the keyword void is used in the function prototype and header to signify that there is no information passed to the function.

Raj Kumar

What is dangling pointer in C? What is wild pointer in C? Give example.

Q : What is dangling pointer in C? What is wild pointer in C? Give example?

Dangling Pointer

Dangling or wild is a pointer which does not point valid object. When a pointer has declared it must be assign a valid address memory address otherwise it will point some location which is not valid. These are special cases of memory safety violations. More generally, dangling references and wild references are references that do not resolve to a valid destination.

Void main()

{

int *pt;

{

int c=10;

pt=&c;

}

printf("\n\t%d",*pt);

}

Raj Kumar

Sunday 28 May 2017

Setting Combo-box Value and Display Data with VB.Net

I was working on a Brokerage Calculation project where I need to load a table’s data into combo box as in the form of value member and display member because a combo-box store two value ID which not shown at drop down list but reside in combo-box .

We need to Set/Get data through value because it’s mostly primary key and display mode for display

field. Take a look on following code:

Dim con As New OleDbConnection(getconstr)

Dim da As New OleDbDataAdapter(sql, con)

Raj Kumar

Friday 26 May 2017

What are merits and demerits of array in C?

Q : What are merits and demerits of array in C?

Why we need an array.

We need array when there is a need to process more than data with similar type. For example

Taking marks of 10 student needs of ten integer
Taking name of more than one character
Structure record and many more

Criteria mentioned above can also be achieved through variable , but variables have following drawback which lead to use array instead of Variable.

Each variable must has unique name which increase complexity when a large number of variables need to make.
Each variable load in memory at random order. So if you want to process all variable then you need to process each variable individually because allocation of space is not continuous.

For understand the above point you need to imagine a real life example.

Two close friend group decided to watch a movie and they follow two different approaches as follows

Friends in Group one purchase ticket individually without any coordination between them for seating arrangement
Friend in group two book seats continuously i.e. seats no 1 to 10.

So Group two can make better communication than group one. In same way array works.

Advantage

Continuous memory allocation.
Process a collection of similar data type.
Can be used to make data structure like stack,tree,queue etc.
Easy to visit each element using index.

Disadvantage

Static memory allocation
Due to static memory allocation number of element cannot be increase nor decrease at run time.
The elements of array are stored in consecutive memory locations. So insertions and deletions are very difficult and time consuming.

Back to Array Home

Raj Kumar

Write a C program to find size of structure without using sizeof operator.

Q : Write a C program to find size of structure without using sizeof operator.

#include<stdio.h>

#include<conio.h>

struct stu

{

int roll;

char name[20];

float marks[3];

};

Raj Kumar

Write a C program to find the square root of a given quadratic equation.

Q1 : Write a C program to find the square root of a given quadratic equation.

#include <math.h>

int main()

{

double a, b, c, determinant, root1,root2, realPart, imaginaryPart;

printf("Enter coefficients a, b and c: ");

scanf("%lf %lf %lf",&a, &b, &c);

determinant = b*b-4*a*c;

Raj Kumar

Wednesday 24 May 2017

Write a C program to print given number of terms of a Fibonacci series.

Q 1 : Write a C program to print given number of terms of a Fibonacci series.

Solution :

#include<stdio.h>

void main()

{

int a,b,c;

c=1;

a=0;

Raj Kumar

Write a C program to read a line and print it reverse using recursive function.

Q : Write a C program to read a line and print it reverse using recursive function.

Solution :

#include<stdio.h>

#include<string.h>

#include<process.h>

void print(int len,char str[])

{

int n=len;

if(n==-1)

exit(1);

Raj Kumar

Sunday 7 May 2017

Call by value Call by reference

Call by value

The call by value method of passing arguments to a function copies the actual value of an argument into the formal parameter of the function. In this case, changes made to the parameter inside the function have no effect on the argument.

Raj Kumar

Wednesday 3 May 2017

Customized web page print using Java Script

Printing a webpage is another important aspect of web development. If you skip this section then when your user will be print a page then it will print as it is, which not good for all case because we add a lot of formatting images on webpage. So all the things on the page will get printed that will be worse.

Customizing web page output is good practice to make a webpage. Because what we see on web page we don’t need to take output on paper same format so customization is mandatory.

Following example will print table as with custom header.

Roll	Name	City
101	Sona	Vns
102	Amit	Alld
103	Sumi	Alld
104	Rakesh	Vns
105	Jyoti	alld

Raj Kumar

Saturday 29 April 2017

Stock and Bill Management Project

I have made this project for your practice only this is live project running in whole sale shoes shop. You can use this project as your course final project because I have seen many students who buy project from market or internet so I made this project online for download every one with free of cost. I also suggest student who’re going to make this project as their course project, please take a look on project and understand what the flow of this project working model are. I don’t want to make use this project as shortcut to only submitting your project. No! This is wrong so try to learn some live coding from this project.

Commercial use of this project without consent is prohibited.

Project Description

This helps to manage stock and billing of a whole shale shop. Primary this project was design for a shoes shop but it can be apply the business which sells some company project which has further some sub type. All the entry left blank. So you can create your own entry. Some demo records are in download database for sake for understood of project work flow. One you will be understands work flow then you customize this project as your requirement.

Raj Kumar

Friday 28 April 2017

Inheritance OOP

Inheritance (Object Oriented Programming)

In object-oriented programming,Inheritance allows us to define a class which is based on another class, which makes it easier to create and maintain an application. This also provides an opportunity to reuse the code functionality and fast implementation time.The derived class is also called subclass and the base class is also known as super-class. The derived class can add its own additional variables and methods. These additional variable and methods differentiates the derived class from the base class.inheritance saves our money and time both because we use predefined compile and tested class which increase quality of software.

Raj Kumar

Tuesday 25 April 2017

Function Pointer

Function pointer is a type of pointer which points a function or code block. You can assign address of a function to function pointer variable and that function using function pointer variable name.

I have a bad experience while making Calculator. In my design all the calculation takes place when user pressed equal button. When a user pressed equal button I need to check every time which operator user was pressed , checked by switch case, it become complicated then I increase more function in my calculator because of lots condition for operator check and attached code for particular logic separately.

Now my work becomes simple because of function pointer because I just need to check operator pressed by user and attached related function code to function pointer. It reduces lots of condition checking and assigns separate code to each section. So function pointer is very useful in some specific scenario.

Advantage of function pointer

Implement Callback
Useful in event handling
One entry point for more than one code block

Raj Kumar

Pages

Friday 9 June 2017

NIELIT O Level C Language Paper Answer January - 2015

1: Objective

Q : Write a C program to modify the constant variable.

Solution :

Thursday 8 June 2017

Q : In the following declaration statement:

char c=’A’;Variable c stores one byte of memory space while character constants ‘A’ stores one byte memory space. How one byte variables can stores two byte character constant? What is automatic type promotion in c?

Solution :

Automatic type promotion

Q : Write a C program to write a line of string in a text file.

Solution :

Monday 5 June 2017

Dynamic fill data gridview using VB.net

Saturday 3 June 2017

Division Flipper Using CSS

Girfa

Student Help

Full Code :

Friday 2 June 2017

Q : Write a C program that displays the recommended actions depending on the color of a traffic light using the switch statement.

Thursday 1 June 2017

Q : Define void data type and write any three use of it.

Q : What is dangling pointer in C? What is wild pointer in C? Give example?

Dangling Pointer

Sunday 28 May 2017

Friday 26 May 2017

Q : What are merits and demerits of array in C?

Advantage

Disadvantage

Q : Write a C program to find size of structure without using sizeof operator.

Wednesday 24 May 2017

Q 1 : Write a C program to print given number of terms of a Fibonacci series.

Solution :

Q : Write a C program to read a line and print it reverse using recursive function.

Solution :

Sunday 7 May 2017

Wednesday 3 May 2017

Saturday 29 April 2017

Project Description

Friday 28 April 2017

Inheritance (Object Oriented Programming)

Tuesday 25 April 2017

Advantage of function pointer

NIELIT O Level

C Language Paper Answer

January - 2015

char c=’A’;
Variable c stores one byte of memory space while character constants ‘A’ stores one byte memory space. How one byte variables can stores two byte character constant? What is automatic type promotion in c?