c_ch01_ex13.c

/*Exercise 1-13. Write a program to print a histogram of the lengths of words in its input. It is easy to draw the histogram with the bars horizontal; a vertical orientation is more challenging.
*/
#include <stdio.h>
#define INDEX 50
int main()
{
        int hist[INDEX], c, i, longest = 0;
        int j, VertScan, HorzScan;
        for (i = 0;i < INDEX; i++)
                hist[i] = 0;
        i = 0;
/*to read the value into array*/
        while ((c = getchar()) != EOF) {
                if (c != ' ' && c != '\t' && c != '\n') {
                        i++;
                        if (longest < i)
                                longest = i;
                } else {
                        if (i > 0)
                                ++hist[i];
                        i = 0;
                }
        }
/*to print horzentally*/
        for (i = 0;i <= longest;i++) {
                printf ("hist[%d]|",i);
                for (j = 0;j < hist[i];j++)
                        putchar ('#');
                printf ("\n");
        }
        printf ("\n");
/*to print vertically*/
        for (VertScan = INDEX-20;VertScan > 0;VertScan--) {
                printf ("%2d|",VertScan);
                for (HorzScan = 1;HorzScan < 20;HorzScan++)
                        if (VertScan <= hist[HorzScan])
                                printf (" # ");
                        else
                                printf ("   ");
                putchar ('\n');
        }
        for (HorzScan = 1;HorzScan <= 20;HorzScan++)
                printf ("  -");
        putchar ('\n');
        printf ("  ");
        for (HorzScan = 1;HorzScan <= 20;HorzScan++)
                printf ("%3d",HorzScan);
        putchar ('\n');
        return 0;
}