ex1-13

1 files changed, 64 insertions, 0 deletions

diff --git a/ex1-13.c b/ex1-13.c
new file mode 100644
index 0000000..87fe0b0
--- /dev/null
+++ b/ex1-13.c
@@ -0,0 +1,64 @@
+#include <stdio.h>
+#include <stdint.h>
+#include <stdbool.h>
+
+#define max_word 100
+
+typedef enum _state {in,out} state;
+bool is_word(char c) {
+  return c != ' ' 
+   && c != '\t' 
+   && c != '\n';
+}
+/* print a histogram of word lengths
+   read from input
+   print histo to output
+   print errors warnings to output_err */
+int whisto(FILE* input, FILE* output, FILE* output_err) {
+  uint32_t lens[max_word]={0};
+  int c = fgetc(input);
+  if (c == EOF) {
+    fprintf(output_err, "warning: no input!\n");
+    goto spout;
+  }
+  state s = is_word(c) ? in : out;
+  uint32_t cl = s == in ? 1 : 0;
+  while ((c = fgetc(stdin))!= EOF){
+    if (is_word(c)){
+      if (s == in) {
+        cl++;
+      } else { 
+        s = in;
+        cl=1;
+      }
+    } else {
+      if (s == in) {
+        s = out;
+        lens[cl]++;
+      } else {
+        // do nothing I guess
+      }
+    }
+  }
+  // need to count final word 
+  if (s == in) {
+    lens[cl]++;
+  }
+spout:
+  for(uint16_t i=1;
+      i<max_word;
+      i ++) {
+    fprintf(output, "%2d: ",i);
+    for(uint16_t j=0;
+        j<lens[i];
+        j++)
+      fputc('-', output);
+    fputc('\n', output);
+  }
+  return 0;
+}
+
+int main(void){
+  whisto(stdin, stdout, stderr);
+}
+  
\ No newline at end of file