K & R C Programs Exercise 1-23.

K and R C, Solution to Exercise 1-23: C program that removes the all comments from a C Program. K and R C Program. Exercises provides the solution to all the exercises in the C Programming Language, second addition, by Brian W.Keringhan and Dennis M.Ritchie(Prentice Hall,1988). You can learn and solve K&R C Programs Exercise. 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
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* and browse!
*
* Happy Coding
***********************************************************/

#include "stdio.h"
void rcomment(int c);
void in_comment(void);
void echo_quote(int c);
main();
{
int c ,d;
while((c= getchar()) !=EOF)
rcomment(c);
return 0;
}
void rcomment(int c) {
int d;
if(c == '/')
if((d= getchar))=='*')
in_comment();
else if(d== '/') {
putchar(c);
rcomment(d);
} else {
putchar(c);
putchar(d);
}
else if(c=='' || c=='"')
echo_quote(c);

}
void in_comment() {
int c, d;
c = getchar();
d = getchar();
while (c!= '*' || d!!='/') {
c = d;
d = getchar();
}
}
void echo_quote(int c) {
int d;
putchar(c);
while ((d = getchar()) != c) {
putchar(d);
if (d == '\')
putchar(getchar());

}
putchar(d);
}
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K & R C Programs Exercise 1-22.

K and R C, Solution to Exercise 1-22:
 C program that folds the very long lines of input into two or more shorter lines. K and R C Programs Exercises provides the solution to all the exercises in the C Programming Language, second addition, by Brian W.Keringhan and Dennis M.Ritchie(Prentice Hall,1988). You can learn and solve K&R C Programs Exercise. 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"

#define MAXSIZE 1000

char line[MAXSIZE];

int get_line(void);


int
main()
{
int i,strlen;
int location, spaceholder;
const int foldlength=70;

while (( strlen = get_line()) > 0 )
{
if( strlen < foldlength )
{
}
else
{

i = 0;
location = 0;
while(i<strlen)
{
if(line[i] == ' ')
spaceholder = i;

if(location==foldlength)
{
line[spaceholder] = 'n';
location = 0;
}
location++;
i++;
}
}
printf ( "%s", line);
}
return 0;
}


int get_line(void)
{
int c, i;
extern char line[];

for ( i=0;i<MAXSIZE-1 && ( c=getchar()) != EOF && c != 'n'; ++i)
line[i] = c;
if(c == 'n')
{
line[i] = c;
++i;
}
line[i] = '';
return i;

}
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K & R C Programs Exercise 1-21.

K and R C, Solution to Exercise 1-21:
C Program to replace string of blanks by the minimum number of tabs and blanks to achieve the same spacing. K and R C Programs Exercises provides the solution to all the exercises in the C Programming Language, second addition, by Brian W.Keringhan and Dennis M.Ritchie(Prentice Hall,1988). You can learn and solve K&R C Programs Exercise. 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"
#define TABSIZE 6 /*Tab increment size*/
main() {
int c, no_blanks, pos, no_tabs;
no_blanks = 0; /*number of blamks required*/
no_tabs = 0; /* number of tabs required*/

for (pos = 1; (c = getchar()) != EOF; ++pos) {
if (c == ' ') {
if (pos % TABSIZE != 0)
++no_blanks;
else {
no_blanks = 0;
++no_tabs;
}
} else {
for (; no_tabs > 0; --no_tabs)
putchar('t');
if (c == 't')
no_blanks = 0;
else
for (; no_blanks > 0; --no_blanks)
putchar(' ');
putchar(c);
if (c == 'n')
pos = 0;
else if (c == 't')
pos = pos + (TABSIZE - (pos - 1) % TABSIZE);

}
}
}

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K & R C Programs Exercise 1-20.

K and R C, Solution to Exercise 1-20:
C Program to replace the tabs by proper number of blanks. K and R C Programs Exercises provides the solution to all the exercises in the C Programming Language, second addition, by Brian W.Keringhan and Dennis M.Ritchie(Prentice Hall,1988). You can learn and solve K&R C Programs Exercise. 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"
#define TABSIZE 6 /*Tab increment size*/
main()
{
int c, no_blanks,pos;
no_blanks = 0; /*number of blamks required*/
pos = 1; /* position of the character*/
while((c=getchar()) != EOF){
if(c == 't'){
no_blanks = TABSIZE-(pos-1)%TABSIZE;
while(no_blanks>0){

putchar(' ');
++pos;
--no_blanks;
}
else if(c == 'n'){
putchar(c);
pos = 1;
} else {
putchar(c);
++pos;
}
}
}
}

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C Program to generate Graph using grphics.h

C Program to Generate the graph sheet using the grphics.h library. To use graphics.h, we have to install the drivers in to the the system by using the initgraph() function. Here  we derive the graph of input sizes verses time taken for input sizes. x axis represents inputs(0,10000,20000,—-), y axis rep time(0,0.05,0.1,0.15—). 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 "graphics.h"
void main() {
int gd = DETECT, gm;
int y = 0, x = 10, m[20], k[20], n, a[20], i;
float b[20];
initgraph(&gd, &gm, "c:\tc\bgi");
printf("nntGenerating the Graphsnn");
printf("nEnter the no. of inputst");
scanf("%d", &n);
printf("nEnter the input sizes and corresponding time takenn");
for (i = 0; i < n; i++) {
printf("nEnter input sizet");
scanf("%d", &a[i]);
printf("nEnter time takent");
scanf("%f", &b[i]);
}
cleardevice();
//represents y axis
line(10, 0, 10, 400);
//represents x axis
line(10, 400, 600, 400);
while (y <= 400) {
line(0, y, 10, y);
y = y + 20;
}
while (x <= 600) {
line(x, 400, x, 410);
x = x + 20;
}
outtextxy(20, 440, "1unit=20 pixels , origin is (10,400)");
outtextxy(
20,
450,
"x axis represents inputs(0,10000,20000,----), yaxis rep time(0,0.05,0.1,0.15---)");
setcolor(5);
for (i = 0; i < n; i++) {
k[i] = (a[i] * 0.002);
m[i] = (400 - (b[i] * 400));
putpixel(k[i], m[i], 11);
}
for (i = 0; i < n - 1; i++)
line(k[i], m[i], k[i + 1], m[i + 1]);
getch();
}
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C Program to implement Linear regression algorithm.

Linear Regression  is the predicting the value of one scalar variable(y) using the explanatory another variable(x). Linear regression  is represented by the equation Y = a + bX, where X is the explanatory variable and Y is the scalar variable. The slope of the line is b, and a is the intercept. For linear list square modeling, Linear regression is very helpful. 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 "math.h"
#include "string.h"

float mean(float *a, int n);
void deviation(float *a, float mean, int n, float *d, float *S);

void main() {
float a[20], b[20], dx[20], dy[20];
float sy = 0, sx = 0, mean_x = 0, mean_y = 0, sum_xy = 0;
float corr_coff = 0, reg_coff_xy = 0, reg_coff_yx = 0;
char type_coff[7];
int n = 0, i = 0;

clrscr();

printf("Enter the value of n: ");
scanf("%d", &n);
printf("Enter the values of x and y:n");
for (i = 0; i < n; i++)
scanf("%f%f", &a[i], &b[i]);
mean_x = mean(a, n);
mean_y = mean(b, n);
deviation(a, mean_x, n, dx, &sx);
deviation(b, mean_y, n, dy, &sy);

for (i = 0; i < n; i++)
sum_xy = sum_xy + dx[i] * dy[i];
corr_coff = sum_xy / (n * sx * sy);
printf("Enter the type of regression coefficient as 'x on y' or 'y on x': ");
fflush(stdin);
gets(type_coff);

if (strcmp(type_coff, "x on y") == 1) {
reg_coff_xy = corr_coff * (sx / sy);
printf("nThe value of linear regression coefficient is %f",
reg_coff_xy);
} else if (strcmp(type_coff, "y on x") == 1) {
reg_coff_yx = corr_coff * (sy / sx);
printf("nThe value of linear regression coefficient is %f",
reg_coff_yx);
} else
printf("nEnter the correct type of regression coefficient.");
getch();
}

float mean(float *a, int n) {
float sum = 0, i = 0;
for (i = 0; i < n; i++)
sum = sum + a[i];
sum = sum / n;
return (sum);
}

void deviation(float *a, float mean, int n, float *d, float *s) {
float sum = 0, t = 0;
int i = 0;
for (i = 0; i < n; i++) {
d[i] = a[i] - mean;
t = d[i] * d[i];
sum = sum + t;
}
sum = sum / n;
*s = sqrt(sum);
}

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C Program to implement Radix Sort.

Radix sort is an algorithm. Radix Sort sorts the elements by processing its individual digits. Radix sort processing the digits either by Least Significant Digit(LSD) method or by Most Significant Digit(MSD) method. 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 info@c-program-example.com
* To find more C programs, do visit www.c-program-example.com
* and browse!
*
* Happy Coding
***********************************************************/

#include "stdio.h"

#define MAX 100
#define SHOWPASS

void print(int *a, int n) {
int i;
for (i = 0; i < n; i++)
printf("%dt", a[i]);
}

void radix_sort(int *a, int n) {
int i, b[MAX], m = 0, exp = 1;
for (i = 0; i < n; i++) {
if (a[i] > m)
m = a[i];
}

while (m / exp > 0) {
int box[10] = { 0 };
for (i = 0; i < n; i++)
box[a[i] / exp % 10]++;
for (i = 1; i < 10; i++)
box[i] += box[i - 1];
for (i = n - 1; i >= 0; i--)
b[--box[a[i] / exp % 10]] = a[i];
for (i = 0; i < n; i++)
a[i] = b[i];
exp *= 10;

#ifdef SHOWPASS
printf("nnPASS : ");
print(a, n);
#endif
}
}

int main() {
int arr[MAX];
int i, num;

printf("nEnter total elements (num < %d) : ", MAX);
scanf("%d", &num);

printf("nEnter %d Elements : ", num);
for (i = 0; i < num; i++)
scanf("%d", &arr[i]);

printf("nARRAY : ");
print(&arr[0], num);

radix_sort(&arr[0], num);

printf("nnSORTED : ");
print(&arr[0], num);

return 0;
}

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K & R C Programs Exercise 1-19

K and R C, Solution to Exercise 1-19:
Write a function reverse(str) that reverses the character string str. Use it to write program that reverse thes its input a line at a time. K and R C Programs Exercises provides the solution to all the exercises in the C Programming Language, second addition, by Brian W.Keringhan and Dennis M.Ritchie(Prentice Hall,1988). You can learn and solve K&R C Programs Exercise. 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"

#define MAXINLINE 1000 /* maximum input line size */

int get_lines(char line[], int maxline);
void reverse(char str[]);

/* print longest input line */
main() {

char line[MAXINLINE]; /* current input line */

while ((get_lines(line, MAXINLINE)) > 0) {

reverse(line);
printf("%s", line);

}

}

/* getline: read a line into s, return length */
int get_lines(char str[], int line) {
int c, i, j;

for (i = 0, j = 0; (c = getchar()) != EOF && c != 'n'; ++i) {
if (i < line - 1) {
str[j++] = c;
}
}
if (c == 'n') {
if (i <= line - 1) {
str[j++] = c;
}
++i;
}
str[j] = '';
return i;
}

/*reverse the string str*/
void reverse(char str[]) {
int i, j;
char temp;
i = 0;
while (str[i] != '')
++i;
--i;
if (str[i] != 'n')

--i;
j = 0;
while (j < i) {
temp = str[j];
str[j] = str[i];
str[i] = temp;
--i;
++j;
}
}

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K & R C Exercise 1-18

K and R C, Solution to Exercise 1-18:
Remove trailing blanks and tabs from each line of input, and to delete entirely blank lines. K and R C Programs Exercises provides the solution to all the exercises in the C Programming Language, second addition, by Brian W.Keringhan and Dennis M.Ritchie(Prentice Hall,1988). You can learn and solve K&R C Programs Exercise. 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"

#define MAXLINE 1000

int get_lines(char line[], int maxline);
int char remove(char str[]);

main()
{

char line[MAXINLINE];/* current input line */

while((get_lines(line,MAXINLINE))>0)
if(remove(line)> 0)
printf("%s", line);
return 0;

}
/*
remove trailing blanks and tabs from character string str
*/
int remove(char str[])
{
int i=0;
while(str[i] !='n')
++i;

--i;

while(i>=0 && (str[i]==' ' || str[i]=='t'))
--i;
if(i>=0)
{
++i;
s[i]='n';
++i;
s[i]='';

}
return i;
}
/* getline: read a line into str, return length */
int get_lines(char str[], int line)
{
int c, i, j;

for(i = 0, j = 0; (c = getchar())!=EOF && c != 'n'; ++i)
{
if(i < line - 1)
{
str[j++] = c;
}
}
if(c == 'n')
{
if(i <= line - 1)
{
str[j++] = c;
}
++i;
}
str[j] = '';
return i;
}

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C Program To Implement Interpolation Search

Interpolation search is an algorithm used for searching a given value in an ordered indexed array. Interpolation search is sometimes called as extrapolation search. For uni formally distributed data items Interpolation search is the best method. for example: library books directory. 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 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 "stdlib.h"

#define MAX 200

int interpolation_search(int a[], int bottom, int top, int item) {

int mid;
while (bottom <= top) {
mid = bottom + (top - bottom)
* ((item - a[bottom]) / (a[top] - a[bottom]));
if (item == a[mid])
return mid + 1;
if (item < a[mid])
top = mid - 1;
else
bottom = mid + 1;
}
return -1;
}

int main() {
int arr[MAX];
int i, num;
int item, pos;

printf("nEnter total elements (num< %d) : ", MAX);
scanf("%d", &num);

printf("Enter %d Elements : ", num);
for (i = 0; i < num; i++)
scanf("%d", &arr[i]);

printf("nELEMENTS AREn: ");
for (i = 0; i < num; i++)
printf("%dt", arr[i]);

printf("nSearch For : ");
scanf("%d", &item);
pos = interpolation_search(&arr[0], 0, num, item);
if (pos == -1)
printf("nElement %d not foundn", item);
else
printf("nElement %d found at position %dn", item, pos);

return 0;
}
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