C- Program to generate Fibonacci Series.

Fibonacci Series :

#include<stdio.h> 
int main(void) 
{ 
    long a,b,c; 
    int i,n; 
    a=0; 
    b=1; 
    printf("Enter the number of terms : "); 
    scanf("%d",&n); 
    printf("%ld ",b); 
    for(i=1; i<n; i++) 
    { 
        c=a+b; 
        printf("%ld ",c); 
        a=b; 
        b=c; 
    } 
    printf("\n"); 
    return 0; 
}

Output:

Enter the number of times : 10
1 1 2 3 5 8 13 21 34 55

Enter number of times : 15
1  1  2  3  5  8  13  21  34  55  89  144  233  377  610

Fibonacci Series Recursive:

#include<stdio.h> 
int fibonacci(int n);         
 
int main(void) 
{ 
    int ntimes, i; 
    printf("Enter number of times : "); 
    scanf("%d",&ntimes); 
     
    for(i=0; i<ntimes; i++) 
        printf("%d  ",fibonacci(i)); 
    printf("\n"); 
    return 0; 
} 
 
int fibonacci(int n)         
{ 
    if(n==0 || n==1) 
        return(1); 
    return(fibonacci(n-1) + fibonacci(n-2)); 
}

Output:

Enter the number of times : 10
1 1 2 3 5 8 13 21 34 55

Enter the number of terms : 20
1 1 2 3 5 8 13 21 34 55 89 144 233 377 610 987 1597 2584 4181 6765

Happy Learning 🙂