How to make the output show the first 100 elements of fibonacci series? What should I do?

Question

#include <stdio.h>
int main()

{
unsigned long long n, first = 0, second = 1, next, c;
printf("Enter the number of terms\n");
scanf("%d",&n);

printf("First %d terms of Fibonacci series are :-\n",n);

for ( c = 1 ; c <= n ; c++ )
{

next = first + second;
first = second;
second = next;

printf("%llu\n",next);
}

return 0;
}

I made a code that was only able to make it show the correct elements from 1st to 93rd element. But from the 94th to 100th. The output is wrong.

Answer 1

scanf("%d", &n);

Here you read input for an `unsigned long long` variable using format specifier for `int`.

I think variable <n> could've been just `int` opposed to `unsigned long long`, same goes with <c>. They are only there to count the loop.

Maybe you can try by using `double'.

Answer 2

That's because you are dealing with numbers that are big enough to not fit inside *int* data type. If you look closely your code is not even displaying 93 elements correctly as your value is again and again going out of range.

I don't think C/C++ have any large enough primitive data type to store that huge numbers.

For that you have to use arrays where each index of array is a digit of the big number