Free C Program

C Program to count number of characters in the file

Posted on by Sandeepa Nadahalli
C Program to count number of characters in the file. In this program you can learn c file operations. Here we counting the characters by reading the characters in the file one by one and if read character was not an ‘n’ ,’t’ or EOF, it increments the counter by one. Read more about C Programming Language .

/***********************************************************
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* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
* contact [email protected]
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* and browse!
* 
*                      Happy Coding
***********************************************************/

#include<stdio.h>
#include<conio.h>

void main()
{
 char ch;
 int count=0;
 FILE *fptr;
 clrscr();
 fptr=fopen("text.txt","w");
 if(fptr==NULL)
 {
  printf("File can't be createda");
  getch();
  exit(0);
 }
 printf("Enter some text and press enter key:n");
 while((ch=getche())!='r')
 {
  fputc(ch,fptr);
 }
 fclose(fptr);
 fptr=fopen("text.txt","r");
 printf("nContents of the File is:");
 while((ch=fgetc(fptr))!=EOF)
 {
  count++;
  printf("%c",ch);
 }
 fclose(fptr);
 printf("nThe number of characters present in file is: %d",count);
 getch();
}

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C Program to Demonstrate the increment and decrement operators

Posted on by Sandeepa Nadahalli

C program which demonstrates the working of increment(++) and decrement(–) operators. Increment operator ++ adds 1 to its operand and Decrement operator — subtracts 1 from its operand.

These operators may be used either as a prefix operator or post-fix operator. Read more here: Increment and decrement operators

The Program

/* C Program to demonstrate increment and decrement operators */
main()
{
/*
* ++i -> i incremented before i is used.
* --i -> i decremented before i is used.
* j++ -> j is incremented AFTER j has been used.
* j-- -> j is decremented AFTER j has been used.
*/
int i=1,j=1;
puts("\tDemo 1");
printf("\t%d %d\n",++i, j++); /* O/P 2 1 */
printf("\t%d %d\n",i, j); /* O/P 2 2 */
i=1; j=1;
puts("\n\tDemo 2");
printf("\t%d \n", i=j++); /* O/P 1 */
printf("\t%d \n", i=++j); /* O/P 3 */
i = 0; j = 0;
puts("\n\tDemo 3");
if ( (i++ == 1) && (j++ == 1)) puts("Some text");
/* Will i and j get incremented? The answer is NO! Because
* the expression in the left of '&&' resolves to false the
* compiler does NOT execute the expression on the right and
* so 'j' does not get executed!!!!! */
printf("\t%d %d\n",i, j); /* O/P 1 0 */
}
view raw increment_decrement.c hosted with ❤ by GitHub

Sample Output

Increment and decrement operators in c

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Airthmatic Operators
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C Program to find GCD and LCM using Recursion

Posted on by Sandeepa Nadahalli
C Program to find the GCD and LCM. In this program we used the Recursion method. Recursion is the programming technique that a process invoking itself again and again. Here find_gcd() and find_(lcm) are the recursive methods. for example LCM and GCD of 8,12 is 24 and 4 Read more about C Programming Language .

/***********************************************************
* You can use all the programs on  www.c-program-example.com
* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
* contact [email protected]
* To find more C programs, do visit www.c-program-example.com
* and browse!
*  
*                      Happy Coding
***********************************************************/

/* 
* http://www.c-program-example.com/2011/10/c-program-to-find-gcd-and-lcm-using.html
*/ 

/* Find this on GitHub: 
*  https://github.com/snadahalli/cprograms/blob/master/gcd_lcm_rec.c
*/

#include "stdio.h"
int find_gcd(int,int);
int find_lcm(int,int);
int main(){
 int num1,num2,gcd,lcm;
 printf("nEnter two numbers:n ");
 scanf("%d %d",&num1,&num2);
 gcd=find_gcd(num1,num2);
 
 printf("nnGCD of %d and %d is: %dnn",num1,num2,gcd);
 
 if(num1>num2)
  lcm = find_lcm(num1,num2);
 else
  lcm = find_lcm(num2,num1);
 
 printf("nnLCM of %d and %d is: %dnn",num1,num2,lcm);
 return 0;
}
 
int find_gcd(int n1,int n2){
 while(n1!=n2){
  if(n1>n2)
   return find_gcd(n1-n2,n2);
  else
   return find_gcd(n1,n2-n1);
 }
 return n1;
}

int find_lcm(int n1,int n2){
 
 static int temp = 1;
 
 if(temp % n2 == 0 && temp % n1 == 0)
  return temp;
 temp++;
 find_lcm(n1,n2);
 
 return temp;
}
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C program to print Fibonacci numbers using Recursion

Posted on by Sandeepa Nadahalli
C Program to print Fibonacci numbers. In this program we used the Recursion method. Recursion is the programming technique that a process invoking itself again and again. Fibonacci numbers are sequence of numbers starts from 0 and 1 , continue by adding previous number. 0,1,1,2,3,5,8,13,…….. Read more about C Programming Language .

/***********************************************************
* You can use all the programs on  www.c-program-example.com
* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
* contact [email protected]
* To find more C programs, do visit www.c-program-example.com
* and browse!
* 
*                      Happy Coding
***********************************************************/

#include<stdio.h> 
#include<conio.h> 
int fib(int); 
int f=1,fib1=0,fib2=0,i=0,j; 
void main() 
{ 
 int num; 
 clrscr(); 
 printf(" How many Fibonacci numbers do you want?n"); 
 scanf("%d",&num); 
 printf("nFibonacci Numbers are:n");
 f=0; 
 printf("n%dn",f); 
 f=1; 
 printf("n%dn",f); 
 for(j=0;j<num-2;j++) 
 { 
  f=fib(num); 
  printf("n%dn",f); 
 } 
 getch(); 
} 
int fib(int n) 
{ 

 while(i<n) 
 { 
  if(i<=n) 
  { 
   i++; 
   fib1=fib2; 
   fib2=f; 
   f=fib2+fib1; 
   fib(1); 
   return f; 
  } 
 } 

} 


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C Program to calculate factorial using Recursive function

Posted on by Sandeepa Nadahalli
C Program to find the factorial of a number. In this program we used the Recursion method. Recursion is the programming technique that a process invoking itself again and again. The standard recursive function for factorial is factorial=n*fact(n-1). factorial of number denoted by ‘!’, means product of all non negative integers from 1 to number. example: 5!=5*4*3*2*1=120. Read more about C Programming Language .

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* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
* contact [email protected]
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* and browse!
* 
*                      Happy Coding
***********************************************************/

#include<stdio.h>
int factorial(int);

void main()
{
 int num;
 printf("Enter the number to calculate Factorial :");
 scanf("%d",&num);
 printf("nFactorial : %d", factorial (num));

}
int factorial (int i)
{
 int f;
 if(i==1)
  return 1;
 else
  f = i* factorial (i-1);
 return f;
}
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Array search program in C

Posted on by Sandeepa Nadahalli

Very often we encounter a situation where we have to search for a given target value in a list of values. Simple value types like integers are stored in arrays. This program demonstrates how to do a search within an array by using a method called linear search.

Linear search, also called as ‘Sequential search’ is a technique of finding a target value within a list. It sequentially checks each element of the list with target value until a match is found or the list is exhausted. This approach may be very inefficient to be used in practical problem solving. However, this is very easy to understand and implement. You can read more about linear search.

This program implements linear search to search for a given integer key in an integer array. We have many more C programs that deal with arrays. See more Programs on Arrays in C.

The Program

#include <stdio.h>
#include <conio.h>
void main()
{
int array[10];
int i, N, keynum, found=0;
printf("Enter the value of N\n");
scanf("%d",&N);
printf("Enter the elements one by one\n");
for(i=0; i<N ; i++)
{
scanf("%d",&array[i]);
}
printf("Input array is\n");
for(i=0; i<N ; i++)
{
printf("%d\n",array[i]);
}
printf("Enter the element to be searched\n");
scanf("%d", &keynum);
for ( i=0; i < N ; i++)
{
if( keynum == array[i] )
{
found = 1;
break;
}
}
if ( found == 1)
printf("Element found in the given array");
else
printf("Element was not found in the array");
} /* End of main */
view raw Linear_array_search.c hosted with ❤ by GitHub

Sample Output


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C Program to check the given number is Armstrong or not?

Posted on by Sandeepa Nadahalli
C Program to check the given number is Armstrong number or not?. Armstrong number is a number that is the sum of its own digits each raised to the power of the number of digits. Example: 153 = 1^3 + 5^3 + 3^3. Read more about C Programming Language .

/***********************************************************
* You can use all the programs on  www.c-program-example.com
* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
* contact [email protected]
* To find more C programs, do visit www.c-program-example.com
* and browse!
* 
*                      Happy Coding
***********************************************************/


#include<stdio.h>
void main()
{
 int num,num1,arms=0,rem;

 printf("Enter the number:n");
 scanf("%d",&num);
 num1=num;
 while(num>0)
 {
  rem=num%10;
  arms=arms+rem*rem*rem;
  num=num/10;
 }
 if(num1==arms)
 {
  printf(" n%d is an Armstrong number",num1);
 }
 else
 {
  printf("n%d is NOT an Armstrong number",num1);
 }

} 
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C Program to Demonstrate getting the parameters from the command line.

Posted on by Sandeepa Nadahalli
C Program to getting the parameters from the command line. To pass the arguments from command line, in main function we have to declare two arguments . First one is number of arguments passed to the program and other one is pointer variable which gives the list of arguments passed. Read more about C Programming Language .

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* You can use all the programs on  www.c-program-example.com
* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
* contact [email protected]
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* and browse!
* 
*                      Happy Coding
***********************************************************/



#include <stdio.h>

main(int argc, char *argv[]) {
 int count;

 /*  Main takes two variables 'argc' is the number of parms on the 
  *  command line and 'argv' is a pointer to each of the parameters.
  *
  * int argc    -- integer number called 'argc'
  * char *argv[] -- Character pointer array!
  */

 printf("%i parameters entered on the command line.n", argc);

 /*
  * progname  argc = 1
  * progname parm1 parm2 argc = 3
  */

 /* 
  * We take 1 from argc because 
  * the argv array starts at zero 
  * an ends at argc -1
  */

 for (count = 0; count <= argc - 1; count++) {
  /* printf expects a pointer 
   * to the text 
   */

  printf("parm %d is %sn", count, argv[count]);
 }
}
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C Program to implement the Newton- Gregory forward interpolation

Posted on by Sandeepa Nadahalli
C Program to implement the Newton- Gregory forward interpolation. Newtons – Gregory forward difference formula is a finite difference identity capable of giving an interpolated value between the tabulated points {fk} in terms of the first value f0 and powers of the forward difference Δ. In this program we used the multidimensional arrays and arrays in c. Read more about C Programming Language .

/***********************************************************
* You can use all the programs on  www.c-program-example.com
* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
* contact [email protected]
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* and browse!
* 
*                      Happy Coding
***********************************************************/



#include<stdio.h>
#include<conio.h>
#define MaxN 100
#define Order_of_diff 4

void main ()
{
 float arr_x[MaxN+1], arr_y[MaxN+1], numerator=1.0, denominator=1.0, x, y, p, h, diff_table[MaxN+1][Order_of_diff+1];
 int i,j,n,k;
 clrscr();

 printf("Enter the value of n n");
 scanf("%d",&n);
 printf("Enter the values of x and y");

 for(i=0; i<=n; i++)
  scanf("%f%f", &arr_x[i], &arr_y[i]);
 printf("Enter the value of x at which value of y is to be calculated");
 scanf("%f", &x);
 h=arr_x[1]-arr_x[0];

 for(i=0; i<=n-1; i++)
  diff_table[i][1]=arr_y[i+1]-arr_y[i];/*Creating the difference table and calculating first order differences*/
 for(j=2; j<=Order_of_diff; j++)/*Calculating higher order differences*/
  for(i=0; i<=n-j; i++)
   diff_table[i][j]=diff_table[i+1][j-1] - diff_table[i][j-1];
 i=0;

 while(!(arr_x[i]>x)) /* Finding x0 */
  i++;
 i--;
 p=(x-arr_x[i])/h;
 y=arr_y[i];

 for (k=1; k<=Order_of_diff; k++)
 {
  numerator *=p-k+1;
  denominator *=k;
  y +=(numerator/denominator)*diff_table[i][k];
 }
 printf("When x=%6.1f, y=%6.2fn",x, y);
 getch();
}

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C Program to print Floyd’s triangle

Posted on by Sandeepa Nadahalli
Floyd’s triangle is the right angled triangular array of natural numbers. Here we used the nested For loop to print the Floyd’s triangle.
Read more about C Programming Language .

/***********************************************************
* You can use all the programs on  www.c-program-example.com
* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
* contact [email protected]
* To find more C programs, do visit www.c-program-example.com
* and browse!
* 
*                      Happy Coding
***********************************************************/

#include<stdio.h>


int main(){
 int i,j,n,k=1;

 printf("Enter the range: ");
 scanf("%d",&n);

 printf("FLOYD'S TRIANGLEnn");
 for(i=1;i<=n;i++){
  for(j=1;j<=i;j++,k++)
   printf(" %d",k);
  printf("n");
 }

 return 0;
}
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