unable to print

hi everyone. im new here.
this my code:

Code:

 #include <math.h>


double main()
{

    double num1;
    double num2;


    printf ("enter number 1: \n");
    scanf("%e" , &num1);
    printf("enter number 2 \n");
    scanf("%e", &num2);

     double arithmetic_mean = (( num1 + num2)/2);
        printf ("Arithmetic Mean is :  \n", arithmetic_mean);;

     double geometric_mean =  sqrt (num1 * num2);
        printf ("Geometric Mean is  : \n" , geometric_mean);


     double harmonic_mean = 2 / ( 1 / num1)+ (1 / num2);
        printf (" Harmonic Mean is : \n", harmonic_mean);


return (0);
}

when i run the program i am unable to print anythin on the last 3 prinf's it just comes up as blank.
how can i correct this?

First you need to include stdio.h for the standard input/output functions. Second main must be defined to return an int, not a double and should return an int. Third in your scanfs you are using the format specifier "%e" which works for a float but you are using a double so the specifier should be "%le" or "%lf". The printfs you have a variable you want to print but you don't have the specifier in the format string:

Code:

printf (" Harmonic Mean is : %e\n", harmonic_mean);

You should look at these links for scanf and printf.

Jim

thanks alot

i jus started c in uni.
make many mistakes

nehal