Program to find the sum of fibonacci series

Program:

#include<stdio.h>
#include<conio.h>
void main()
{
    int a = -1, b = 1, c = 0, i, n, sum = 0;
    clrscr();
    printf("Enter the limit : ");
    scanf("%d", &n);
    printf("\nThe fibonacci series is : \n\n");
    for(i = 1 ; i <= n ; i++)
    {
        c = a + b ;
        printf("%d \t", c);
        sum = sum + c;
        a = b;
        b = c;
    }
    printf("\n\nThe sum of the fibonacci series is : %d", sum);
    getch();
}

Output:

Enter the limit : 5
The fibonacci series is :
0 1 1 2 3
The sum of the fibonacci series is : 7