/* --------------------------------------------------------------------- 
//  Figure 4.14: Using increment in a loop.  
// --------------------------------------------------------------------- 
*/

#include <stdio.h>              

void main( void )                                             
{   
    int N;
    int x = 0;                  /* Loop counter. */
    double sum = 0.0;           /* Sum of terms 1/x. */                    

    puts( "\n Summing 1.0/x for x between 1 and N.\n" );
    printf( " Please enter an integer N greater than 1: " );  
    scanf( "%i", &N );  
                                 
    if (N <= 1) {               /* Screen out faulty inputs. */
        printf( "\n Input value %i is too small.\n\n", N );
    }
    else {          
        while (x < N) {
            ++x;
            sum += 1.0 / x; 
        } 
        printf( " The sum is %g \n\n", sum );
    }
}