C Program for Fibonacci numbers code example

Example 1: c program for fibonacci series

#include <stdio.h>
int main() {
    int i, n, t1 = 0, t2 = 1, nextTerm;
    printf("Enter the number of terms: ");
    scanf("%d", &n);
    printf("Fibonacci Series: ");

    for (i = 1; i <= n; ++i) {
        printf("%d, ", t1);
        nextTerm = t1 + t2;
        t1 = t2;
        t2 = nextTerm;
    }

    return 0;
}

Example 2: C Program for Fibonacci numbers

fib(5)   
                     /                  
               fib(4)                fib(3)   
             /                      /     
         fib(3)      fib(2)         fib(2)    fib(1)
        /             /           /      
  fib(2)   fib(1)  fib(1) fib(0) fib(1) fib(0)
  /    
fib(1) fib(0)

Example 3: c how to fibonacci

#include <stdio.h>
#include <stdlib.h>

int main() {
	long int a = 1,b = 2, c, d, cont = 0;
	double e, f;
	
	printf("Fibonacci fino a: ");
	scanf("%ld", &c);
	
	while(b < c)
	{
		cont ++;
		printf("\n%ld", b);
		d = a;
		a = b;
		b = b + d;
	}
	
	f = (double)b / (double)a;
	
	e = (double)cont / (double)c * (double)100;
	
	printf("\n\nOttenuto: %lf\nPercentuale: %lf\n\n\n", f, e);
	
	system("pause");
}