C SOURCE CODES

Articles in the C SOURCE CODES Category

A Virus Program to Disable USB Ports

Sunday, 19 Jul, 2009 – 17:42 | 43 Comments

In this post I will show how to create a simple virus that disables/blocks the USB ports on the computer (PC). As usual I use my favorite C programming language to create this virus. Anyone with …

How to Make a Trojan Horse

Sunday, 5 Apr, 2009 – 18:41 | 81 Comments

Most of you may be curious to know about how to make a Trojan or Virus on your own. Here is an answer for your curiosity. In this post I’ll show you how to make a simple …

A Virus Program to Block Websites

Friday, 21 Nov, 2008 – 8:46 | 65 Comments

Most of us are familiar with the virus that used to block Orkut and Youtube site. If you are curious about creating such a virus on your own, here is how it can be done. As …

A Virus Program to Restart the Computer at Every Startup

Friday, 17 Oct, 2008 – 8:49 | 99 Comments

Today I will show you how to create a virus that restarts the computer upon every startup. That is, upon infection, the computer will get restarted every time the system is booted. This means that …

File Embedder Project in C

Monday, 21 Jul, 2008 – 8:40 | 8 Comments

Some times it is necessary for our compiled project to have it’s supporting files embedded within the EXE module itself so that the supporting files may not be put into a seperate folder and carried …

C Program Without a Main Function

Monday, 3 Mar, 2008 – 1:20 | 34 Comments

How to write a C program without a main function?. Is it possible to do that. Yes there can be a C program without a main function. Here’s the code of the program without a …

Guessing Game In C

Saturday, 1 Mar, 2008 – 8:14 | 7 Comments

This is a small guessing game written in C. In this guessing game you have to guess a number between 0 & 100. You have 8 chances to do that. Every time you guess wrongly …

A Self Destructing Program in C

Saturday, 1 Mar, 2008 – 7:35 | 21 Comments

This program will destroy itself upon execution. The program will cause the .exe file to be deleted upon execution. That is this program is capable of destroying itself upon execution. Here is the code
 
 
#include
#include
#include
void main()
{
printf(“This …

C Program for Pigeon Breeding Problem

Thursday, 28 Feb, 2008 – 16:33 | 8 Comments

The problem is as follows…
Initially I have a pair of adult pigeons (capable of breeding) which give rise to another young pair every month until it reaches the age of 5 years (60 months). But …

C Program to Set/Change the Current System Date

Wednesday, 16 Jan, 2008 – 13:56 | 5 Comments

This program can be used to set the system date or to change the current system date.
 
 
 
#include
#include
#include
int main(void)
{
struct date reset;
struct date save_date;
getdate(&save_date);
printf(“Original date:\n”);
system(“date”);
reset.da_year = 2001;
reset.da_day = 1;
reset.da_mon = 1;
setdate(&reset);
printf(“Date after setting:\n”);
system(“date”);
setdate(&save_date);
printf(“Back to …

C Program to Get the Current System Date

Wednesday, 16 Jan, 2008 – 13:47 | One Comment

This program will get or read the current system date from the system. It displays Year, Month and Day.
 
 
 
 
#include
#include
int main(void)
{
struct date d;
getdate(&d);
printf(“The current year is: %d\n”, d.da_year);
printf(“The current day is: %d\n”, d.da_day);
printf(“The current …

C Program to Set/Change the Current System Time

Wednesday, 16 Jan, 2008 – 11:50 | No Comment

This program can be used to set or change the system time
#include
#include
int main(void)
{
struct time t;
gettime(&t);
printf(“The current hour is: %d\n”, t.ti_hour);
printf(“The current min is: %d\n”, t.ti_min);
printf(“The current second is: %d\n”, t.ti_sec);
/* Add one to …

C Program to Get the Current System Time

Wednesday, 16 Jan, 2008 – 11:30 | 2 Comments

This program reads the current system time and displays it in the form HH:MM:SS
#include
#include
int main(void)
{
struct time t;
gettime(&t);
printf(“The current time is: %2d:%02d:%02d\n”, t.ti_hour, t.ti_min, t.ti_sec);
return 0;
}

C Program to Generate Random Numbers

Wednesday, 16 Jan, 2008 – 11:10 | 7 Comments

This is a simple program to generate random numbers. This logic can be used to build a Lotto program or a program to pick Lucky number and so on. Here’s the program
#include
#include
#include
int main(void)
{
int …

C Program To Accept Password

Tuesday, 11 Dec, 2007 – 12:46 | 12 Comments

This is a simple login program in C. While accepting password it masks each character using ‘*’ symbol and display the password in the next line after the user hits Enter key. It also accepts …

How to Create a Computer Virus?

Friday, 7 Dec, 2007 – 9:17 | 81 Comments

This program is an example of how to create a virus in C. This program demonstrates a simple virus program which upon execution (Running) creates a copy of itself in the other file. Thus it …

C Program to Generate Numbers in Pyramid Pattern

Friday, 7 Dec, 2007 – 8:47 | 10 Comments

This C program generates the numbers in pyramid pattern. It takes the input from two through nine and generates the numbers in the pyramid pattern. For example if the input is 4 then the program …

C Program to Print the Entered Number in Words

Tuesday, 4 Dec, 2007 – 16:32 | 4 Comments

The following C program print’s the entered number in words. For example if the number entered is 12345 then the program prints the entered number in words as One Two Three Four Five
 
 
#include
void main()
{
int i=0;
unsigned …

C Program to display the No. of Digits in an Entered Number

Monday, 3 Dec, 2007 – 12:13 | 2 Comments

This program displays the number of digits present in the number that is entered through the input.
#include
#include
void main()
{
unsigned long int num;
int i=0;
clrscr();
printf(“Enter the digit\n”);
scanf(“%lu”,&num);
while(num!=0)
{
num=num/10;
++i;
}
printf(“Length=%d”,i);
getch();
}

Program To Print A String Without Using Any Output Statements

Friday, 30 Nov, 2007 – 13:39 | 6 Comments

This program can be used to print a string without using any output statements such as printf, puts etc. However this program only works in 16-bit mode since it directly writes to VDU Memory
 
#include
#include
char str[]=”Hello …

C Program to Print a Character without using any Output Statements

Sunday, 25 Nov, 2007 – 6:45 | 6 Comments

This program can be used to print character without using any output statements. This program only works in 16-bit mode since it directly writes to VDU Memory.
 
 
#include
#include
void main()
{
char far *p=(char far *)0xb8000000;
*p=’A’;
getch();
}

C Program to Remove Comments and Blank lines from a valid C Program

Saturday, 24 Nov, 2007 – 12:03 | 10 Comments

This program accepts any valid C Program as an input and removes the comments and blanks from it. The output is a program that has no comments and blank lines.

#include
#include
#include
#include
void main()
{
FILE *a,*b;
char fname[20],ch,tch=NULL,tch1=NULL;
int flag1=0,flag=0,count=0,count1=0,count2=0;
clrscr();
printf(“Enter the …

Program to Print it’s Own Source Code

Saturday, 24 Nov, 2007 – 11:15 | 10 Comments

Here is a C program to print it’s own source code. That is the output of this program is exactly same as it’s source code. Here’s the program

#include
char *program=”#include%cchar *program=%c%s%c;%cvoid main()%c{%cprintf(program,10,34,program,34,10, 10,10,10);%c}”;
void main()
{
printf(program,10,34,program,34,10,10,10,10);
}