C program to count the leaves of the binary tree.

Write a C program to count the leaves of the binary tree.
Binary tree is the ordered directed tree data structure, in which each node has at most two nodes.
A node is called as a leaf node,  if it does not contains any child elements. In this program, We used the structures to create the binary tree.
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#include <stdio.h>
#include <stdlib.h>
#include <conio.h>

struct node
{
int data;
struct node* leftnode;
struct node* rightnode;
};

//get the leaves count
unsigned int getLeafCount(struct node* node)
{
if(node == NULL)
return 0;
if(node->leftnode == NULL && node->rightnode==NULL)
return 1;
else
return getLeafCount(node->leftnode)+
getLeafCount(node->rightnode);
}


struct node* newNode(int data)
{
struct node* node = (struct node*)
malloc(sizeof(struct node));
node->data = data;
node->leftnode = NULL;
node->rightnode = NULL;

return(node);
}


int main()
{

clrcsr();
struct node *root = newNode(1);
root->leftnode = newNode(2);
root->rightnode = newNode(3);
root->leftnode->leftnode = newNode(4);
root->leftnode->rightnode = newNode(5);


printf("nnLeaf count of the binary tree is %d", getLeafCount(root));

getch();
return 0;
}


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K & R C Programs Exercise 6-4.

K and R C, Solution to Exercise 6-4:
K and R C Programs Exercises provides the solution to all the exercises in the C Programming Language (2nd Edition). You can learn and solve K&R C Programs Exercise.
Write a C Program that prints the distinct words in its input sorted into decreasing order of frequency of occurrence. Precede each word by its count. Read more about C Programming Language .

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***********************************************************/


#include<stdio.h>
#include<ctype.h>

#define MAXWORD 100
#define NDISTINCT 1000

struct tnode(
char *word;
int count;
struct tnode *addtree(struct tnode *, char *);
int getword(char *, int);
void sortlist(void);
void treestore(struct tnode *);
struct tnode *list[DISTINCT];
int ntn = 0;

/* print distinct words sorted in decreasing order of freq.*/
main()
{
struct tnode *root;
char word[MAXWORD]
int i;

root = NULL;
while(getword(word, MAXWORD) != EOF)
if(isalpha(word[0]))
root = addtree(root, word);
treestore(root);
sortlist();
for(i = 0;i < ntn; i++)
printf("%2d:%20sn",list[i]->count,list[i]->word);
return 0;
}

//getword: get next word or character from input
int getword(char *word, int lim)
{
int c, d, comment(void), getch(void);
void ungetch(int);
char *w = word;
while(isspace(c = getch()))
;
if(c !=EOF)
*w++ = c;
if(isalpha(c) || c == '-' || c == '#'){
for(; --lim > 0; w++)
if(!isalnum(*w = getch()) && *w != '-') {
ungetch(*w);
break;
}
}
else if(c == ''' || c == '\'){
for( ; --lim > 0; w++)
if(((*w = getch()) == '\')
*++w = getch();
else if(*w == c) {
w++;
break;
}else if(*w == EOF)
break;
}else if(c == '/')
if((d = getch()) == '*')
c = comment();
else
ungetch(d);
*w = '';
return c;
}


//comment: skip over comment and return a character
int comment()
{
int c;
while((c = getch()) != EOF)
if(c == '*')
if((c = getch()) == '/')
break;
else
ungetch(c);
return c;
}

//TREESTORE:STORE IN LIST[] POINTERS TO TREE NODES

void treestore(struct tnode *p)
{
if(p != NULL) {
treestore(p->left);
if(ntn < NDISTINCT)
list[ntn++] = p;
treestore(p->right);
}
}

//sortlist: sort list of pointers to tree nodes
void sortlist()
{
int gap, i,j;
struct tnode *temp;

for(gap = ntn/2;gap > 0;gap /= 2)
for(i = gap; i < ntn;i++)
for(j = i - gap;j >= 0;j -= gap) {
if((list[j]->count) >= (list[j+gap]->count))
break;
temp = list[j];
list[j] = list[j+gap];
list[j+gap] = temp;
}
}
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C Program to add two polynomials using structures.

C Program to add two polynomials using structures. Structure is a c composite data type, in which we can define all the data types under the same name or object. Size of the Structure is the size of all data types, plus any internal padding. the key word “struct” is used to declare the structure. A Polynomial is a mathematical expression involving a sum of powers in one or more variables multiplied by coefficients. Read more about C Programming Language .

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***********************************************************/

#include < stdio.h >
#include < conio.h >
#define MAX 20

struct addpolynomial {
int exp, coef;
};

void main() {
struct addpolynomial p1[MAX], p2[MAX], p3[MAX];
int max1, max2, max3;
clrscr();
printf("nEnter first addpolynomial : ");
max1 = read_addpolynomial(p1);
printf("nEnter second addpolynomial : ");
max2 = read_addpolynomial(p2);
max3 = add_addpolynomial(p1, p2, p3, max1, max2);
printf("nFirst addpolynomial is ");
print_addpolynomial(p1, max1);
printf("nSecond addpolynomial is ");
print_addpolynomial(p2, max2);
printf("n The resultant addpolynomial after addition is");
print_addpolynomial(p3, max3);
}

//function to read polynomial
int read_addpolynomial(struct addpolynomial p[]) {
int i, texp;
i = 0;
printf("nEnter exp ( use -1 to exit) : ");
scanf("%d", &texp);
while (texp != -1) {
p[i].exp = texp;
printf("nEnter coef : ");
scanf("%d", &p[i].coef);
i++;
printf("nEnter exp ( use -1 to exit) : ");
scanf("%d", &texp);
}
return (i);
}

//function to print polynomial
int print_addpolynomial(struct addpolynomial p[], intMAX1) {
int i;
for (i = 0; i < max1; i++)
printf("%+dX%d ", p[i].coef, p[i].exp);
return;
}

//function to ad polynomials
int add_addpolynomial( p1, p2, p3, max1, max2)
struct addpolynomial p1[], p2[], p3[];
intMAX1, max2;
{
int i,j,k;
i = j = k = 0;
while ( i <max1 && j <max2)
{
if( p1[i].exp > p2[j].exp)
{
p3[k] = p1[i];
k++;
i++;
}
else
if( p1[i].exp < p2[j].exp)
{
p3[k] = p2[j];
k++;
j++;
}
else
{
p3[k].exp = p1[i].exp;
p3[k].coef = p1[i].coef + p2[j].coef;
i++;
j++;
k++;
}
}
while( i <max1 )
{
p3[k] = p1[i];
k++;
i++;
}
while( j <max2 )
{
p3[k] = p2[j];
k++;
j++;
}
return(k);
}

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C Program to perform complex numbers operations using structure.

C Program to perform complex numbers operations using structure. Complex numbers are numbers which contains two parts, real part and imaginary part. Complex numbers are written as a+ib, a is the real part and b is the imaginary part. We used the structure in C to define the real part and imaginary part of the complex number.
Read more about C Programming Language .

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*
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***********************************************************/



#include<stdio.h>
#include<math.h>

void arithmetic(int opern);

struct comp
{
double realpart;
double imgpart;
};

void main()
{
int opern;
clrscr();
printf("nn ttt***** MAIN MENU *****");
printf("nn Select your option: n 1 : ADDn 2 : MULTIPLYn 0 : EXIT nntt Enter your Option [ ]bb");

scanf("%d",&opern);

switch(opern)
{
case 0:
exit(0);
case 1:
case 2:
arithmetic(opern);
default:
main();
}

}

void arithmetic(int opern)
{

struct comp w1, w2, w;

printf("n Enter two Complex Numbers (x+iy):n Real Part of First Number:");
scanf("%lf",&w1.realpart);
printf("n Imaginary Part of First Number:");
scanf("%lf",&w1.imgpart);
printf("n Real Part of Second Number:");
scanf("%lf",&w2.realpart);
printf("n Imaginary Part of Second Number:");
scanf("%lf",&w2.imgpart);


switch(opern)
{

/*addition of complex number*/
case 1:
w.realpart = w1.realpart+w2.realpart;
w.imgpart = w1.imgpart+w2.imgpart;
break;

/*multiplication of complex number*/
case 2:
w.realpart=(w1.realpart*w2.realpart)-(w1.imgpart*w2.imgpart);
w.imgpart=(w1.realpart*w2.imgpart)+(w1.imgpart*w2.realpart);
break;
}


if (w.imgpart>0)
printf("n Answer = %lf+%lfi",w.realpart,w.imgpart);
else
printf("n Answer = %lf%lfi",w.realpart,w.imgpart);
getch();
main();
}
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