update

c-basic/log.c

@@ -0,0 +1,13 @@
+#include <stdio.h>
+#include <math.h>
+
+int main()
+{
+  double result;
+
+  result = log10(1000);
+
+  printf("%f\n", result);
+
+  return 0;
+}

c-basic/sin_cos_tan.c

@@ -0,0 +1,24 @@
+#include <stdio.h>
+#include <math.h>
+
+int main()
+{
+  double result;
+  
+  result = sin(3.141592653589793238462643 / 6);
+  printf("%f\n", result);
+
+  result = cos(3.141592653589793238462643 / 3);
+  printf("%f\n", result);
+
+  result = sin(3.141592653589793238462643 / 4) / cos(3.141592653589793238462643 / 4);
+  printf("%f\n", result);
+
+  result = tan(3.141592653589793238462643 / 2);
+  printf("%f\n", result);
+
+  result = tan(3.141592653589793238462643 / 4);
+  printf("%f\n", result);
+
+  return 0;
+}