There's some truth to that. When I first started programming, I thought the more clever I was the better. I worked at minimizing the lines of code and using as many tricks as I could just to show how clever I was. Then I tried going back to some of that code and tried to understand it. It would sometimes take me longer to make sense of it than it had taken me originally to write it. Now I strive for clarity. I use explicit variable names and will sometimes add a line of code if I think it makes my intention more clear. Then I add sufficient comments so that I can immediately understand the intent when reviewing the code. I only use "tricks" when no other method will suffice and then I add extra comments, like breadcrumbs so I can find my way back through my original logic...
 | C (pronounced like the letter C) is a general-purpose computer programming language developed between 1969 and 1973 by Dennis Ritchie at the Bell Telephone Laboratories for use with the Unix Operating systems Although C was designed for implementing system software it is also widely used for developing portable applications software. C is one of the most widely used programming languages of all time and there are very few computer architectures for which a C compiler does not exist. C has greatly influenced many other popular programming languages, most notably C++, which began as an extension to C. |
c programming examples
Example 1 - C hello world program
/* A very simple c program printing a string on screen*/
#include<stdio.h>
main()
{
printf("Hello World\n");
return 0;
}Output of above program:
"Hello World"
Example 2 - c program to take input from user using scanf
#include<stdio.h>
main()
{
int number;
printf("Enter a number\n");
scanf("%d",&number);
printf("Number entered by you is %d\n", number);
return 0;
}Output:
Enter a number
5
Number entered by you is 5
Example 3 - using if else control instructions
#include<stdio.h>
main()
{
int x = 1;
if ( x == 1 )
printf("x is equal to one.\n");
else
printf("For comparison use == as = is the assignment operator.\n");
return 0;
}Output:
x is equal to one.
Example 4 - loop example
#include<stdio.h>
main()
{
int value = 1;
while(value<=3)
{
printf("Value is %d\n", value);
value++;
}
return 0;
}Output:
Value is 1
Value is 2
Value is 3
Example 5 - c program for prime number
#include<stdio.h>
main()
{
int n, c;
printf("Enter a number\n");
scanf("%d", &n);
if ( n == 2 )
printf("Prime number.\n");
else
{
for ( c = 3 ; c <= n - 1 ; c++ )
{
if ( n % c == 0 )
break;
}
if ( c != n )
printf("Not prime.\n");
else
printf("Prime number.\n");
}
return 0;
}Example 6 - command line arguments
#include<stdio.h>
main(int argc, char *argv[])
{
int c;
printf("Number of command line arguments passed: %d\n", argc);
for ( c = 0 ; c < argc ; c++)
printf("%d. Command line argument passed is %s\n", c+1, argv[c]);
return 0;
}Above c program prints the number and all arguments which are passed to it.
Example 7 - Array program
#include<stdio.h>
main()
{
int array[100], n, c;
printf("Enter the number of elements in array\n");
scanf("%d", &n);
printf("Enter %d elements\n", n);
for ( c = 0 ; c < n ; c++ )
scanf("%d", &array[c]);
printf("Array elements entered bu you are:\n");
for ( c = 0 ; c < n ; c++ )
printf("array[%d] = %d\n", c, array[c]);
return 0;
}Example 8 - function program
#include<stdio.h>
void my_function();
main()
{
printf("Main function.\n");
my_function();
printf("Back in function main.\n");
return 0;
}
void my_function()
{
printf("Welcome to my function. Feel at home.\n");
}Example 9 - Using comments in a program
#include<stdio.h>
main()
{
// Single line comment in c source code
printf("Writing comments is very useful.\n");
/*
* Multiline comment syntax
* Comments help us to understand code later easily.
* Will you write comments while developing programs ?
*/
printf("Good luck\n");
return 0;
}Example 10 - using structures in c programming
#include<stdio.h>
struct programming
{
float constant;
char *pointer;
};
main()
{
struct programming variable;
char string[] = "Programming in Software Development.";
variable.constant = 1.23;
variable.pointer = string;
printf("%f\n", variable.constant);
printf("%s\n", variable.pointer);
return 0;
}Example 11 - c program for fibonacci series
#include<stdio.h>
#include<conio.h>
main()
{
int n, first = 0, second = 1, next, c;
printf("Enter the number of terms ");
scanf("%d",&n);
printf("First %d terms of fibonacci series are :-\n",n);
for ( c = 0 ; c < n ; c++ )
{
if ( c <= 1 )
next = c;
else
{
next = first + second;
first = second;
second = next;
}
printf("%d\n",next);
}
getch();
return 0;
}Example 12 - c graphics programming
#include <graphics.h>
#include<conio.h>
main()
{
int gd = DETECT, gm;
initgraph(&gd, &gm,"C:\\TC\\BGI");
outtextxy(10,20, "Graphics source code example.");
circle(200, 200, 50);
setcolor(BLUE);
line(350, 250, 450, 50);
getch();
closegraph( );
return 0;
}For gcc compiler users
If you are using gcc compiler on linux operating system then you need to modify programs. For example consider the following programs which prints first ten natural numbers
#include<stdio.h>
#include<conio.h>
main()
{
int c;
for ( c = 1 ; c <= 10 ; c++ )
printf("%d\n", c);
getch();
return 0;
}Above source code includes a header file <conio.h> and uses function getch, but this file is Borland specific so it works in turbo c compiler but not in gcc. So the code for gcc should be like
#include<stdio.h>
main()
{
int c;
/* for loop */
for ( c = 1 ; c <= 10 ; c++ )
printf("%d\n", c);
return 0;
}If using gcc compiler save the code in a file say numbers.c, to compile the program open the terminal and enter command gcc numbers.c, this will compile the program and to execute the program enter command ./a.out .
