#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#define NHASH 29989 //Use a prime number!
#define MULT 31

struct node
{
	char *word;
	int count;
	struct node * next;
} node;

typedef struct node Node;

Node *bin[NHASH];

unsigned int hash(char *p)
{
	unsigned int h = 0;
	for(; *p; p++)
		h = MULT * h + *p;
	return h % NHASH;
}

void incword(char *s)
{
	Node * p;
	int h = hash(s);
	for(p = bin[h]; p!= NULL; p = p->next)
	{
		if(strcmp(s, p->word) == 0)
		{
			(p->count)++;
			return;
		}
	}
	p = (Node *)malloc(sizeof(node));
	if(!p)
		return;
	p->count = 1;
	p->word = (char *)malloc(strlen(s)+1);
	strcpy(p->word, s);
	p->next = bin[h];
	bin[h] = p;
}

int main()
{
	char buf[100];
	for (int i=0; i<NHASH; i++)
		bin[i] = NULL;
	while(scanf("%s", buf) == 1)
		incword(buf);
	for (int i = 0; i < NHASH; i++)
		for (Node * p = bin[i]; p != NULL; p = p->next)
			printf("%s %d\n", p->word, p->count);
	return 0;
}

Implement a hash table for strings

String Hash Table

C