I'm going to take this in good faith and assume that you are thinking of old school FORTRAN77. Modern Fortran (90 and onwards) is a very different language in many ways whilst maintaining high backwards compatibility. You should check out modern versions of the language and code examples.

Fortran is a language more suited for numerical computing than C++. Modern Fortran is simpler, more maintable and more easily optimised than C++. Yes one could pick a subset of C/C++ and write fast numerical code but it would require more work and more discipline than using modern Fortran.