/* ----------------------------------------------------------------------- 
// Figure 9.9: The importance of parameter order.
//             An error with parameter order.
// -----------------------------------------------------------------------
//     This is a void function that takes TWO ARGUMENTS.  
//     The first argument value determines the number of marks printed
//     in the line and the second determines what mark is printed.  
*/
#include <stdio.h>
#include <math.h>

void n_marks( double d, char ch );                   /* function prototype */

/* ----------------------------------------------------------------------- */
void main ( void )
{
    double x, fx;                         /* How many characters to print */
    char ch1, ch2;                        /* The characters to print      */

    printf( "\nEnter two characters to print: " );
    scanf( " %c %c", &ch1, &ch2 );

    printf( "\nEnter the value of x: " );
    scanf( "%lg", &x );
    n_marks( ch1, x );                 /* Call function to print ch1 x's. */
    printf( "The value of x = %.2f", x );

    fx =  sqrt( x );
    printf( " the square root of x = %.2f \n", fx );
    n_marks( fx, ch2 );         /* Call function to print sqrt(x) ch2's.  */
}

/* ----------------------------------------------------------------------- */
void n_marks( double n, char ch )
{
    int k;                                 /* # of stars already printed  */ 
                                                                 
    putchar( '\n' );                                                 
    for (k = 0; k < n; ++k)  putchar( ch );              /* print n marks */                                        
    printf( "\n\n" );                           /* flush output to screen */
}