1-13

diff --git a/1/13.c b/1/13.c
new file mode 100644 (file)
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--- /dev/null
+++ b/1/13.c
@@ -0,0 +1,34 @@
+/*
+       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 BUF 50 /* max word length */
+
+int main () {
+       int c, l, i, lngst;     /* character, length, index, longest */
+       int count[BUF];         /* length count */
+       
+       /* initialise to zero */
+       for (i=0; i<BUF; i++) count[i]=0;
+       lngst=l=0;
+
+       while ((c=getchar())!=EOF) {
+               if (c==' ' || c=='\t' || c=='\n') {     /* space */
+                       if (l) {        /* if word just ended */
+                               if (l>lngst) lngst=l;   /* update longest */
+                               count[l-1]++;   /* add length to count */
+                               l=0;                    /* reset length count */
+                       }
+               } else l++;     /* count word length */
+       }
+       while (lngst--) {       /* for each count */
+               printf("%2.d|", lngst+1);                       /* length */
+               while (count[lngst]--) printf("#");     /* count (bar) */
+               printf("\n");                                           /* newline */
+       }       
+}