C Program to implement the Lagrange interpolation

Posted on October 14, 2011 by Sandeepa Nadahalli

C Program to implement the Lagrange interpolation. Lagrange interpolation is the polynomial interpolation. It is the process of passing a polynomial of degree n-1 through n points. In this program we used the arrays in c. Read more about C Programming Language .

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#include<stdio.h>
#include<conio.h>
#define MaxN 90

void main()
{
 float arr_x[MaxN+1], arr_y[MaxN+1], numerator, denominator, x, y=0;
 int i, j, n;
 clrscr();
 printf("Enter the value of n: n");
 scanf("%d", &n);
 printf("Enter the values of x and y: n");
 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);
 for (i=0; i<=n; i++)
 {
  numerator=1;
  denominator=1;
  for (j=0; j<=n; j++)
   if(j!=i)
   {
    numerator *= x-arr_x[j];
    denominator *= arr_x[i]-arr_x[j];
   }
  y+=(numerator/denominator)*arr_y[i];
 }
 printf("When x=%4.1f y=%7.1fn",x,y);
 getch();
}

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C Program to implement Insertion sort.

Posted on October 13, 2011 by Sandeepa Nadahalli

Insertion sorting technique is the elementary sorting technique. Insertion sort sorts one element at a time, It is just like manual sorting by humans. Insertion sort is better for small set of elements. Insertion sort is slower than heap sort, shell sort, quick sort,and merge sort. 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 info@c-program-example.com
* To find more C programs, do visit www.c-program-example.com
* and browse!
* 
*                      Happy Coding
***********************************************************/


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

void inst_sort(int []);

void main()
{
 int num[5],count;
 clrscr();
 printf("nEnter the Five Elements to sort:n");

 for (count=0;count<5;count++)
  scanf("%d",&num[count]);
 inst_sort(num);

 printf("nnElements after sorting: n");
 for(count=0;count<5;count++)
  printf("%dn",num[count]);
 getch();
}

// Function for Insertion Sorting
void inst_sort(int num[])
{
 int i,j,k;
 for(j=1;j<5;j++)
 {
  k=num[j];
  for(i=j-1;i>=0 && k<num[i];i--)
   num[i+1]=num[i];
  num[i+1]=k;
 }
}

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C Program to reverse the first n characters in a file.

Posted on October 13, 2011 by Sandeepa Nadahalli

C Program to reverse the first n characters in a file using the command line arguments. Here we read the file name and n are specified on the command line. If file exists, it reverse the n characters, else it gives the error message. 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 info@c-program-example.com
* To find more C programs, do visit www.c-program-example.com
* and browse!
* 
*                      Happy Coding
***********************************************************/


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

void main(int argc, char *argv[])
{
 char a[15];
 char s[20];
 char n;
 int k;
 int j=0;
 int i;
 int len;
 FILE *fp;

 if(argc!=3)
 {
  puts("Improper number of arguments.");
  exit(0);
 }
 fp = fopen(argv[1],"r");
 if(fp == NULL)
 {
  puts("File cannot be opened.");
  exit(0);
 }

 k=*argv[2]-48;
 n = fread(a,1,k,fp);
 a[n]='