c program for fibonacci numbers

1#include <stdio.h>
2int main() {
3    int i, n, t1 = 0, t2 = 1, nextTerm;
4    printf("Enter the number of terms: ");
5    scanf("%d", &n);
6    printf("Fibonacci Series: ");
7
8    for (i = 1; i <= n; ++i) {
9        printf("%d, ", t1);
10        nextTerm = t1 + t2;
11        t1 = t2;
12        t2 = nextTerm;
13    }
14
15    return 0;
16}
17

1#include <stdio.h>
2#include <stdlib.h>
3
4int main() {
5	long int a = 1,b = 2, c, d, cont = 0;
6	double e, f;
7	
8	printf("Fibonacci fino a: ");
9	scanf("%ld", &c);
10	
11	while(b < c)
12	{
13		cont ++;
14		printf("\n%ld", b);
15		d = a;
16		a = b;
17		b = b + d;
18	}
19	
20	f = (double)b / (double)a;
21	
22	e = (double)cont / (double)c * (double)100;
23	
24	printf("\n\nOttenuto: %lf\nPercentuale: %lf\n\n\n", f, e);
25	
26	system("pause");
27}

1
2						fib(5)   
3                     /                  
4               fib(4)                fib(3)   
5             /                      /     
6         fib(3)      fib(2)         fib(2)    fib(1)
7        /             /           /      
8  fib(2)   fib(1)  fib(1) fib(0) fib(1) fib(0)
9  /    
10fib(1) fib(0)
11