C Program that counts total prime number?

This is a discussion on C Program that counts total prime number? within the C Programming forums, part of the General Programming Boards category; I need to write c program which would count total numbers of prime between 0 & input value. I cannot ...

  1. #1
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    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

  2. #2
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    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;
    }

  3. #3
    Algorithm Dissector iMalc's Avatar
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    Your for loop should not be going up to argc, that is the count of how many arguments were provided, but you want the value of one of the arguments.
    You're also missing one of the arguments to printf (for the given format string). You need to combine bits of he comented out printf line with the one above it.
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