A simple C project to design a model of Electronic Voting Machine by baba shankar

C Code for a sample Electronic Voting Machine

click here for the source code

A Electronic voting machine is basically a digital machine that accepts votes and display the result.IN this blog we are gonna know about how to design a model of simple electronic machine in C.

I have provided all the details below . for further details and how the output works see the youtube video I made.

EVM Code:

#include <stdlib.h> #include<stdio.h> #include<string.h> void printMessageCenter(const char* message) { int len =0; int pos = 0; //calculate how many space need to print len = (78 - strlen(message))/2; printf("\t\t\t"); for(pos =0 ; pos < len ; pos++) { //print space printf(" "); } //print message printf("%s",message); } void headMessage(const char *message) { system("cls"); printf("\t\t\t###########################################################################"); printf("\n\t\t\t############ ############"); printf("\n\t\t\t############ Voting Machine ############"); printf("\n\t\t\t############ ############"); printf("\n\t\t\t###########################################################################"); printf("\n\t\t\t---------------------------------------------------------------------------\n"); printMessageCenter(message); printf("\n\t\t\t----------------------------------------------------------------------------"); } void welcomeMessage() { headMessage("Welcome to The Election"); printf("\n\n\n\n\n"); printf("\n\t\t\t *------------------*\n"); printf("\n\t\t\t =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-="); printf("\n\t\t\t = WELCOME ="); printf("\n\t\t\t = TO ="); printf("\n\t\t\t = ELECTRONIC ="); printf("\n\t\t\t = VOTING ="); printf("\n\t\t\t = MACHINE ="); printf("\n\t\t\t =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-="); printf("\n\t\t\t *------------------*\n"); printf("\n\n\n\t\t\t Enter any key to continue....."); getch(); } void main() { welcomeMessage(); int n,n1,n3,n4,n5,maxi,sum,pos,flag,k=0,co=0,br=0; char filename[10]; char st[100][100],vote[100][100]; char sy[100],cp[20],t[100]; int count[100]={0};char n2,a; printf(" ..................... WELCOME TO CLAIM YOUR RIGHT TO VOTE ......................\n"); printf("\n"); printf("\n"); printf("\n"); printf("\n\n\n"); headMessage("CANDIDATES"); printf("\nEnter the number of candidates participating in the election :\n");//entering candidate details scanf("%d",&n5); int i = 0,j; while(i<n5) { int temp=0; printf("\n\n\n"); printf("==========for %d candidate=========\n",i+1); printf("\n\n"); printf("Enter the Name of the candidate : \n"); scanf("%s",st[i]); printf("\nEnter the Symbol of the candidate :\n"); scanf(" %c",&a); for(j = 0; j<i; j++) { if(sy[j] == a) { printf("\n\aThe symbol is already taken.\n\n"); printf("Please re-enter the details of the candidate.\n"); temp = 1; break; } } if (temp == 0) { sy[i] = a; i++; } } printf("\n\n\n"); printf("Enter 1 to vote or any other key to exit the poll :\n"); scanf("%d",&n1); if(n1!=1) exit(1); while(n1==1) {printf("\n\n\n");printf("\n\n\n"); printf("Press enter to continue....\n"); getch(); char *date = malloc(sizeof(char) * 8); headMessage("VOTER DETAILS"); printf("\nEnter your voter ID\n"); scanf("%s",date); strcpy(vote[k],date); k++; if(strcmp(t,date)==0) co=-1; for(i=0;i<k+1;i++) { if(strcmp(date,vote[i])==0) co++; } if(co==1) flag=0; else flag=1; co=0; if(flag==0) { FILE *fp = fopen("voters.csv", "r"); if (!fp) { printf("Can't open file\n"); return 0; } char buf[1024];//Buffer of 1 kilo byte; Can be varied accordingly int field_count = 0; int entries = 0; fgets(buf, 1024, fp);//Skip heading row char *field = strtok(buf, ","); while(fgets(buf, 1024, fp)) { field_count = 0; field = strtok(buf, ",");//Store next kilobyte into buffer; if(strcmp(field,date) == 0)//Check if date matches input { while(field){ if (field_count == 0) { printf("\nVOTER ID:\t"); } if (field_count == 1) { printf("NAME:\t"); } if (field_count == 2) { printf("AGE:\t"); } printf("%s\n", field); field = strtok(NULL, ","); field_count++; } printf("\n"); } } fclose(fp); printf("\n\n\n");printf("\n\n\n"); printf("Press any key to continue......\n"); getch(); printf("Cast your vote by selecting the symbol of your representative\n"); headMessage("CASTING THE VOTE"); printf("\n");printf("\n");printf("\n"); printf("Enter the symbol of your Representative :\n"); for(i=0;i<n5;i++) { printf("%d. %s (%c)\n",i+1,st[i],sy[i]); } int fl=0; scanf(" %c",&n2); for(i=0;i<n5;i++) { if(n2==sy[i]) {fl=1; break; } else fl=0; } if(fl==1) { for(i=0;i<n5;i++) { if(n2==sy[i]) count[i]++; } printf("\aThank You ! Your vote has been casted.\n");printf("\n\n\n");printf("\n\n\n"); printf("Press any key to continue\n"); getch();} else{ strcpy(t,date); printf("\n\n\n"); printf("\aWrong symbol is entered. Enter the correct symbol\n"); printf("The details are to be re-entered.\n"); printf("\n\n\n"); printf("Press any key to continue\n"); getch(); continue; } headMessage("MENU"); while(n1==1) { printf("\n");printf("\n");printf("\n"); printf("Enter your choice \n1. Results\n2. Difference between the votes of any two candidates\n3. Finish your voting\n4. EXIT the Poll\n "); scanf("%d",&n); if(n==1) { headMessage("Results"); printf("\n\n\n"); printf("The Result according to votes casted so far is as follows : \n"); printf("\n");printf("\n");printf("\n"); for(i=0;i<n5;i++) { printf(" %s( %c): %d\n",st[i],sy[i],count[i]); } } else if(n==2) { headMessage("Difference"); printf("\n\n\n"); for(i=0;i<n5;i++) { printf("%d. %s (%c)\n",i+1,st[i],sy[i]); } printf("Enter the serial nos. of whose vote count differences are to be known : \n"); scanf("%d%d",&n3,&n4); if(count[n3-1]==count[n4-1]) printf("It's a Tie between both the candidates'\n"); printf("\n\n\n"); printf("The difference between %s and %s is %d",st[n3-1],st[n4-1],count[n3-1]-count[n4-1]); } else if(n==3) { break; } else if(n>4) { printf("\aWRONG OPTION ENTERED TRY AGAIN"); } else n1=0; } } else printf("\a\a\a\a\aError!!!! You already casted your vote ");printf("\n\n\n"); printf("press any key to continue\n"); } headMessage(" FINAL RESULTS"); for(i=0; i<n5; i++) { /* File name for storing Candidate details */ sprintf(filename, "file%d.apk", i+1); FILE * fPtr; /* If above operation is failed print error and exit */ if(fPtr == NULL) { /* File not created hence exit */ printf("Unable to create file.\n"); exit(EXIT_FAILURE); } /* Writing data in the file */ fPtr = fopen(filename, "w"); printf("\nCandidate : %s",st[i]); fprintf(fPtr,"candidate:%s\n",st[i]); printf("\t Symbol : %c",sy[i]); fprintf(fPtr,"symbol:%c\n",sy[i]); printf("\t Votes : %d\n",count[i]); fprintf(fPtr,"votes:%d\n",count[i]); /* Closing the file */ fclose(fPtr); }}

The project is divided into few parts

1.The program first asks to enter the information of the participants participating in the election and a symbol(only special characters) for each of them.

Restriction: Any two people taking the two symbol should not be permitted,an error message should be displayed.

2.Entering the voter id present in the csv file click here for sample csv file .

sample CSV:

Restriction:A person should vote only once ,if the voted voter id is entered error symbol is displayed.

3.casting the vote- The voter will be allowed to vote a candidate by choosing the symbol.

 Restriction:If wrong symbol is entered error message will be displayed.

4.Displaying option such as

• results
• difference
• finish voting
• exit the poll

5.Once the 4th option is entered that is to exit the poll.The candidates information like name,symbol and final number of votes are displayed. And the special thing is that one file for each participant will be displayed containing his details..

by babashankarsn@gmail.com(baba shankar)