Can't see the printf() output while debugging in VS Code

Question

I tried running the following C program:

#include <stdio.h>
main()
{

   for (int fehr = 0; fehr < 300; fehr = fehr + 20)
   {
        printf("%3d\t%6f\n", fehr, (5.0 / 9.0) * (fehr - 32.0));
   }
}

When running normally, I get the following output, as expected:

 0     -17.777778
 20     -6.666667
 40     4.444444 
 60     15.555556
 80     26.666667
100     37.777778
120     48.888889
140     60.000000
160     71.111111
180     82.222222
200     93.333333
220     104.444444
240     115.555556
260     126.666667
280     137.777778

But when I debug the program line by line (and inside the loop), I can't see the output anywhere. The compiler is gcc and the debugger is cppdbg. Any ideas?