c - Fibonacci series sum -

i have following code:

#include<stdio.h> void main() {   int = -1, b = 1, c = 0, i, n, sum = 0 ;   printf("enter limit : ") ;   scanf("%d", &n) ;   printf("\nthe fibonacci series :") ;   for(i = 1 ; <= n ; i++)   {    c = + b ;    printf("%d-", c) ;    sum = sum + c ;    = b ;    b = c ;   }   printf("\nthe sum of fibonacci series : %d", sum) ;   printf("\n"); } 

now need find term of series makes sum bigger 7 digits, how can that? p.s new c , sorry english.

if want first sum of 7 digits, set threshold 1 million, known 1e6 = 10**6 = 1000000. notice there 7 digits in 1000000.

if want sum have more 7 digits, set threshold ten million. number has 8 digits.

the following code trick. note instead of for loop, have while loop keeps iterating while sum less threshold.

# include <stdio.h>  int main() {   int previous, current = 0, next = 1,       sum = current, threshold;   printf("enter threshold: ") ;   scanf("%d", &threshold) ;   printf("fibonacci series: %d", current) ;   while (sum < threshold) {     previous = current;     current = next;     next = previous + current;     printf(" + %d", current) ;     sum += current;   }   printf(" = %d\n", sum);   return 0; }