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

#define MAX_CANDIDATES 5

struct Candidate {
    char name[50];
    int votes;
    struct Candidate *next;
};

struct Candidate* createCandidate(char name[]) {
    struct Candidate* candidate = (struct Candidate*)malloc(sizeof(struct Candidate));
    strcpy(candidate->name, name);
    candidate->votes = 0;
    candidate->next = NULL;
    return candidate;
}

void vote(struct Candidate *candidates) {
    printf("Choose a candidate: ");
    char choice[50];
    scanf("%s", choice);

    struct Candidate *current = candidates;
    while (current != NULL) {
        if (strcmp(current->name, choice) == 0) {
            current->votes++;
            printf("Vote cast for %s\n", current->name);
            return;
        }
        current = current->next;
    }

    printf("Invalid choice. Vote not counted.\n");
}

void displayResults(struct Candidate *candidates) {
    printf("\nElection Results\n");
    struct Candidate *current = candidates;

    // Display candidates and their votes
    while (current != NULL) {
        printf("%s: %d votes\n", current->name, current->votes);
        current = current->next;
    }

    // Find the winner or check for ties
    int maxVotes = 0;
    struct Candidate *winner = NULL;
    current = candidates;

    while (current != NULL) {
        if (current->votes > maxVotes) {
            maxVotes = current->votes;
            winner = current;
        } else if (current->votes == maxVotes && winner != NULL) {
            // Handle ties
            printf("\nIt's a tie between %s and %s!\n", winner->name, current->name);
            return;
        }
        current = current->next;
    }

    if (winner != NULL) {
        printf("\nThe winner is %s with %d votes!\n", winner->name, winner->votes);
    } else {
        printf("\nNo winner. No votes recorded.\n");
    }
}

void freeCandidates(struct Candidate *candidates) {
    struct Candidate *current = candidates;
    while (current != NULL) {
        struct Candidate *nextCandidate = current->next;
        free(current);
        current = nextCandidate;
    }
}

int main() {
    struct Candidate *head = NULL;

    // Initialize candidates
    for (int i = 0; i < MAX_CANDIDATES; i++) {
        char name[50];
        printf("Enter the name of Candidate %d: ", i + 1);
        scanf("%s", name);

        struct Candidate *newCandidate = createCandidate(name);
        newCandidate->next = head;
        head = newCandidate;
    }

    // Allow users to vote
    int numVoters;
    printf("\nEnter the number of voters: ");
    scanf("%d", &numVoters);

    if (numVoters <= 0) {
        printf("Invalid number of voters. Exiting.\n");
        return 1;
    }

    for (int i = 0; i < numVoters; i++) {
        printf("\nVote %d\n", i + 1);
        vote(head);
    }

    // Display results
    displayResults(head);

    // Free allocated memory
    freeCandidates(head);

    return 0;
}
by

C Language online compiler

Write, Run & Share C Language code online using OneCompiler's C online compiler for free. It's one of the robust, feature-rich online compilers for C language, running the latest C version which is C18. Getting started with the OneCompiler's C editor is really simple and pretty fast. The editor shows sample boilerplate code when you choose language as 'C' and start coding!

Read inputs from stdin

OneCompiler's C online editor supports stdin and users can give inputs to programs using the STDIN textbox under the I/O tab. Following is a sample C program which takes name as input and print your name with hello.

#include <stdio.h>
int main()
{
    char name[50];
    printf("Enter name:");
    scanf("%s", name);
    printf("Hello %s \n" , name );
    return 0;
    
}

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
}