C Program to Compute First N Fibonacci Numbers using Command Line Arguments

#include < stdio.h>
 
/* Global Variable Declaration */
int first = 0;
int second = 1;
int third;
/* Function Prototype */
void rec_fibonacci(int);
 
void main(int argc, char *argv[])/* Command line Arguments*/
{
    int number = atoi(argv[1]);
    printf("%d\t%d", first, second); /* To print first and second number of fibonacci series */
    rec_fibonacci(number);
    printf("\n");
}
 
/* Code to print fibonacci series using recursive function */
void rec_fibonacci(int num)
{
    if (num == 2)    /* To exit the function as the first two numbers are already printed */
    {
        return;
    }
    third = first + second;
    printf("\t%d", third);
    first = second;
    second = third;
    num--;
    rec_fibonacci(num);
}

Output

  10 
 0         1         1         2         3         5         8         13        21        34 

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