Added test07

tests/ref07.txt

@@ -0,0 +1 @@
+0 is 0.000000, sin(pi/2) is 1.000000 and 3*1.5 is 4.500000.

tests/test07.c

@@ -0,0 +1,20 @@
+#include <math.h>
+#include <stdio.h>
+
+#ifndef M_PI
+#define M_PI 3.14159265358979323846
+#endif
+
+int main(int argc, char **argv)
+{
+	long double zero = 0.0;
+
+	double si = sin(M_PI / 2.0);
+
+	int a = 3;
+	float b = 1.5;
+	float mul = a * b;
+
+	printf("0 is %Lf, sin(pi/2) is %f and 3*1.5 is %f.\n", zero, si, mul);
+	return 0;
+}