Exercise 5-8 - CBD page 199 - Lone Leth Thomsen

/**Solution to exercise 5.8, p. 199, "C by Dissection"
 *
 * 
 * Prints a diamond in the middle of the screen. The diamond is printed by printing two halves, upper  
 * and lower. 
 *
 * 07. March, Lone Leth Thomsen
 **/

#include <ctype.h>
#include <stdio.h>

#define N 5                          


void repeat (char c, int how_many)    /* prints a character on the screen how_many times */
{
        int i;

        for (i=0; i < how_many; ++i)
                putchar(c);
}

int main(void)                        /* main program */
{
        char c = 'X';                     /* the character X will be printed */
        int i;

                                      /* upper half of diamond */
        for (i = 1; i < N; i += 1){       
                repeat(' ',(N-i));            /* prints blanks N-i times */
                repeat(c,i);                  /* then prints X i times */
                repeat(c,i);                  /* then prints X i times again */
                putchar('\n');                /* finally newline. Could also have been done by printing blanks again */
        };
                                          /* lower half of diamond */
        for (i = 1; i < N; i += 1){       
                repeat(' ',i);                /* prints blanks i times */      
                repeat(c,(N-i));              /* then prints X N-i times */           
                repeat(c,(N-i));              /* then prints X N-i times again */
                putchar('\n');                /* finally newline.  */     
        }
        return 0;
}

	#define N 5
	defines width

 

	void repeat (char c, int how_many) /* prints a character on the screen how_many times */
	prints a character on the screen how_many times

 

	char c = 'X'; /* the character X will be printed */
	the character X will be printed

 

	for (i = 1; i < N; i += 1){ repeat(' ',(N-i)); /* prints blanks N-i times */ repeat(c,i); /* then prints X i times */ repeat(c,i); /* then prints X i times again */ putchar('\n'); /* finally newline. Could also have been done by printing blanks again */ };
	upper half of diamond

 

	for (i = 1; i < N; i += 1){ repeat(' ',i); /* prints blanks i times */ repeat(c,(N-i)); /* then prints X N-i times */ repeat(c,(N-i)); /* then prints X N-i times again */ putchar('\n'); /* finally newline. */ }
	lower half of diamond