1-15

diff --git a/1/15.c b/1/15.c
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--- /dev/null
+++ b/1/15.c
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+/*
+       Exercise 1-15. Rewrite the temperature conversion program of Section 1.2
+       to use a function for conversion. 
+       ===
+*/
+
+#include <stdio.h>
+
+/* fahrenheit to celsius */ 
+float f2c (int f) {
+       return (5.0/9.0)*(f-32.0);
+}
+
+int main () {
+       int f;  /* fahrenheit */
+       for (f=0; f<=300; f+=20)
+               printf("%3d %6.1f\n", f, f2c(f));
+}