Thread: C Program that counts total prime number?

I need to write c program which would count total numbers of prime between 0 & input value. I cannot use scanf so I must write main function. using command line argument..
Please Please Help Me

if you cannot help
me
this is what I wrote so far

this is the code I wrote
but the output is wrong
this one only suppose to post the prime number.

Code:

#include <stdio.h>

main( int argc, char *argv[] ) {

        int     n=0, i, found_a_factor;
   
   
   
   
        for (n=2; n<=argc; n++) {
                found_a_factor = 0;
                for (i=2; i <= n-1; i++)
                        if (n % i == 0) found_a_factor = 1;
                if (found_a_factor == 0)
                 printf("F(%s) = %s\n",argv[1]);
            //printf ("%d\n", n);
        }
        return 0;
}