• the_tech_beastOP
    link
    fedilink
    arrow-up
    1
    ·
    3 years ago

    yes but sum() gives the value 90 in the main function. Why is that?

      • the_tech_beastOP
        link
        fedilink
        arrow-up
        2
        arrow-down
        1
        ·
        3 years ago

        Oh… so cout << and return don’t mean the same thing.

        • tmpod@lemmy.pt
          link
          fedilink
          arrow-up
          5
          ·
          3 years ago

          No. Printing something to the console (pushing something to cout with the << operator) is not the same as returning a value.

          Think of returns like what you have in math. When you have a function, let’s say

          int double(int n) {
              return 2 * n;
          }
          

          that returns an int, calling it will “replace” the expression with its result, much like in math. So in this instance, doing 3 + double(2) would be like doing 3 + 4. Math is the same way; if you have a function, f(x) = 2x, doing 3 + f(2) would be the same as doing 3 + 4.

          Printing to the console involves doing I/O (input/output), and actually writing a string to a file, which then the terminal can display.

        • ChinaNumberOne
          link
          fedilink
          arrow-up
          5
          arrow-down
          1
          ·
          3 years ago

          don’t know if you are a beginner to programming in general or c/c++ specifically but it’s better to start with c before c++, it’s simpler and clearer (than c++) to a beginner

          then cout syntax is absolutely horrible and very misleading, use c’s printf or, if you can, use fmt, it’s super fast and even simpler than c’s printf

          • glibg10b
            link
            fedilink
            arrow-up
            2
            ·
            1 year ago

            If you want to learn C++, you should start with C++. Starting with C will form unsafe habits and teach unsafe paradigms that have been replaced by language features or parts of the C++ standard library

            it’s simpler and clearer (than c++) to a beginner

            A language only seems as clear as the tutorial used to teach it. If you think the basics of C++ can be better taught using a C tutorial,. you’ve been looking at the wrong C++ tutorials. Transitioning from C to C++ will be a confusing process for a beginner

        • LunaticHacker
          link
          fedilink
          arrow-up
          2
          ·
          3 years ago

          Of course they aren’t the same. try to achieve the same output with int sum() instead of void sum() this small exercise will help you understand the difference