Editorial Staff - - C Programming Tutorial
In this program, we are going to share a C program for Implement Hash Tables. If you are a beginner and want to start learning the C programming, then keep your close attention in this tutorial as I am going to share a C program for Implement Hash Tables.
Copy the below C program and execute it with the help of Turbo C compiler. At the end of this program, We have shared the output of this program.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 | #include<stdio.h> #include<stdlib.h> struct data { int key; int value; }; struct data *array; int capacity = 10; int size = 0; /* this function gives a unique hash code to the given key */ int hashcode(int key) { return (key % capacity); } /* it returns prime number just greater than array capacity */ int get_prime(int n) { if (n % 2 == 0) { n++; } for (; !if_prime(n); n += 2); return n; } /* to check if given input (i.e n) is prime or not */ int if_prime(int n) { int i; if ( n == 1 || n == 0) { return 0; } for (i = 2; i < n; i++) { if (n % i == 0) { return 0; } } return 1; } void init_array() { int i; capacity = get_prime(capacity); array = (struct data*) malloc(capacity * sizeof(struct data)); for (i = 0; i < capacity; i++) { array[i].key = 0; array[i].value = 0; } } /* to insert a key in the hash table */ void insert(int key) { int index = hashcode(key); if (array[index].value == 0) { /* key not present, insert it */ array[index].key = key; array[index].value = 1; size++; printf("\n Key (%d) has been inserted \n", key); } else if(array[index].key == key) { /* updating already existing key */ printf("\n Key (%d) already present, hence updating its value \n", key); array[index].value += 1; } else { /* key cannot be insert as the index is already containing some other key */ printf("\n ELEMENT CANNOT BE INSERTED \n"); } } /* to remove a key from hash table */ void remove_element(int key) { int index = hashcode(key); if(array[index].value == 0) { printf("\n This key does not exist \n"); } else { array[index].key = 0; array[index].value = 0; size--; printf("\n Key (%d) has been removed \n", key); } } /* to display all the elements of a hash table */ void display() { int i; for (i = 0; i < capacity; i++) { if (array[i].value == 0) { printf("\n Array[%d] has no elements \n"); } else { printf("\n array[%d] has elements -:\n key(%d) and value(%d) \t", i, array[i].key, array[i].value); } } } int size_of_hashtable() { return size; } void main() { int choice, key, value, n, c; clrscr(); init_array(); do { printf("\n Implementation of Hash Table in C \n\n"); printf("MENU-: \n1.Inserting item in the Hash Table" "\n2.Removing item from the Hash Table" "\n3.Check the size of Hash Table" "\n4.Display a Hash Table" "\n\n Please enter your choice -:"); scanf("%d", &choice); switch(choice) { case 1: printf("Inserting element in Hash Table\n"); printf("Enter key -:\t"); scanf("%d", &key); insert(key); break; case 2: printf("Deleting in Hash Table \n Enter the key to delete-:"); scanf("%d", &key); remove_element(key); break; case 3: n = size_of_hashtable(); printf("Size of Hash Table is-:%d\n", n); break; case 4: display(); break; default: printf("Wrong Input\n"); } printf("\n Do you want to continue-:(press 1 for yes)\t"); scanf("%d", &c); }while(c == 1); getch(); } |
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