#include <stdio.h>
#include <stdlib.h>

#define TABLE_SIZE 10

struct Node {
    int key;
    struct Node* next;
};

struct Node* createNode(int key) {
    struct Node* newNode = (struct Node*)malloc(sizeof(struct Node));
    if (newNode == NULL) {
        printf("Memory allocation failed\n");
        exit(EXIT_FAILURE);
    }
    newNode->key = key;
    newNode->next = NULL;
    return newNode;
}

void insert(int hashTable[], int key, int* collisions) {
    int index = key % TABLE_SIZE;
    if (hashTable[index] == -1) {
        // If the slot is empty, insert the key
        hashTable[index] = key;
    } else {
        // If the slot is not empty, find the next available slot
        int i = index + 1;
        while (i != index) {
            if (i >= TABLE_SIZE) {
                i = 0; // Wrap around
            }
            if (hashTable[i] == -1) {
                // Found an empty slot, insert the key
                hashTable[i] = key;
                break;
            } else {
                i++;
                (*collisions)++;
            }
        }
        if (i == index) {
            // Couldn't find an empty slot
            printf("Hash table is full, could not insert %d\n", key);
        }
    }
}

void display(int hashTable[]) {
    printf("Hash Table:\n");
    for (int i = 0; i < TABLE_SIZE; i++) {
        printf("Index %d: ", i);
        if (hashTable[i] == -1) {
            printf("Empty\n");
        } else {
            printf("%d", hashTable[i]);
            int current = (i + 1) % TABLE_SIZE;
            while (current != i) {
                if (hashTable[current] != -1) {
                    printf(" -> %d", hashTable[current]);
                }
                current = (current + 1) % TABLE_SIZE;
            }
            printf("\n");
        }
    }
}

int main() {
    int hashTable[TABLE_SIZE];
    for (int i = 0; i < TABLE_SIZE; i++) {
        hashTable[i] = -1;
    }

    int n, key, collisions = 0;
    printf("Enter the number of elements to insert: ");
    scanf("%d", &n);
    printf("Enter %d elements to insert:\n", n);
    for (int i = 0; i < n; i++) {
        scanf("%d", &key);
        insert(hashTable, key, &collisions);
    }

    display(hashTable);
    printf("Number of collisions (linear probing with chaining and replacement): %d\n", collisions);

    return 0;
}
by

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    return 0;
    
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About C

C language is one of the most popular general-purpose programming language developed by Dennis Ritchie at Bell laboratories for UNIX operating system. The initial release of C Language was in the year 1972. Most of the desktop operating systems are written in C Language.

Key features:

  • Structured Programming
  • Popular system programming language
  • UNIX, MySQL and Oracle are completely written in C.
  • Supports variety of platforms
  • Efficient and also handle low-level activities.
  • As fast as assembly language and hence used as system development language.

Syntax help

Loops

1. If-Else:

When ever you want to perform a set of operations based on a condition if-else is used.

if(conditional-expression) {
   // code
} else {
   // code
}

You can also use if-else for nested Ifs and if-else-if ladder when multiple conditions are to be performed on a single variable.

2. Switch:

Switch is an alternative to if-else-if ladder.

switch(conditional-expression) {    
case value1:    
 // code    
 break;  // optional  
case value2:    
 // code    
 break;  // optional  
...    
    
default:     
 // code to be executed when all the above cases are not matched;    
}

3. For:

For loop is used to iterate a set of statements based on a condition.

for(Initialization; Condition; Increment/decrement){  
  // code  
}

4. While:

While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.

while(condition) {  
 // code 
}

5. Do-While:

Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.

do {
  // code 
} while (condition);

Arrays

Array is a collection of similar data which is stored in continuous memory addresses. Array values can be fetched using index. Index starts from 0 to size-1.

Syntax

One dimentional Array:

data-type array-name[size];

Two dimensional array:

data-type array-name[size][size];

Functions

Function is a sub-routine which contains set of statements. Usually functions are written when multiple calls are required to same set of statements which increases re-usuability and modularity.

Two types of functions are present in C

  1. Library Functions:

Library functions are the in-built functions which are declared in header files like printf(),scanf(),puts(),gets() etc.,

  1. User defined functions:

User defined functions are the ones which are written by the programmer based on the requirement.

How to declare a Function

return_type function_name(parameters);

How to call a Function

function_name (parameters)

How to define a Function

return_type function_name(parameters) {  
  //code
}