floatscan-experiment.c: make use of EXIT_SUCCESS

c-programming/experiments/floatscan-experiment.c

@@ -42,6 +42,7 @@
 #include <math.h>
 #include <stdint.h>
 #include <stdio.h>
+#include <stdlib.h>
 
 /* wrapping code --- beginning */
 const char* fgetc_ptr = NULL;
@@ -592,6 +593,7 @@ int main(int argc, char** argv) {
 	printf("Decimal floating-point format: %Lf\n", result);
 	printf("Double floating-point format : %Lg\n", result);
 	printf("Hexadecimal form             : %La\n", result);
-	return 0;
+
+	return EXIT_SUCCESS;
 }
 /* test code --- end */