float comparison!

gowrikumar/src/08b-incrfloat.c

@@ -0,0 +1,43 @@
+/**
+ * :author: Dan Buch (daniel.buch@gmail.com)
+ */
+
+#include <stdio.h>
+#include <math.h>
+
+int main()
+{
+    float f = 0.0f;
+    int i;
+
+    for (i = 0; i < 10; i++) {
+        f = f + 0.1f;
+    }
+
+    if (f == 1.0) {
+        printf("f is 1.0 \n");
+        /* nope! */
+    }
+
+    if (f == 1.000000) {
+        printf("f is perhaps 1.000000?\n");
+        /* nope again */
+    }
+
+    printf("f is neither 1.0 nor 1.000000\n");
+    printf("(f is really %.24f)\n", f);
+    printf("OH NOES!\n");
+    printf("But...\n");
+
+    double difference = fabs(f - 1.000000);
+
+    if (difference < 0.00001) {
+        printf("f is close enough to 1.000000 (off by %.24f)\n", difference);
+        /* yes? */
+    } 
+
+    return 0;
+}
+
+/* vim:filetype=c:fileencoding=utf-8
+ */