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 .
/***********************************************************
* 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<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;
}
}
Read more c programs
C Basic
C Strings
K and R C Programs Exercise
You can easily select the code by double clicking on the code area above.
To get regular updates on new C programs, you can Follow @c_program
You can discuss these programs on our Facebook Page. Start a discussion right now,
our page!
Share this program with your Facebook friends now! by liking it
(you can send this program to your friend using this button)
Like to get updates right inside your feed reader? Grab our feed!