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    <p>As stated @Krishnabhadra, all previous responses from other users, have a correct interpretation, and I just want to make a more detailed analysis of some points.</p> <p>In the Old-C as in ANSI-C the "<strong>untyped formal parameter</strong>", take the dimencion of your work register or instruction depth capability (shadow registers or instruction cumulative cycle), in an 8bit MPU, will be an int16, in a 16bit MPU and so will be an int16 an so on, in the case 64bit architectures may choose to compile options like: -m32.</p> <p><em>Although it seems simpler implementation at high level, For pass multiple parameters, the work of the programmer in the control dimencion data type step, becomes more demanding.</em></p> <p>In other cases, for some microprocessors architectures, the ANSI compilers customized, leveraged some of this old features to optimize the use of the code, forcing the location of these "untyped formal parameters" to work within or outside the work register, today you get almost the same with the use of "volatile" and "register".</p> <p><strong>But it should be noted that the most modern compilers, not make any distinction between the two types of parameters declaration.</strong></p> <p>Examples of a compilation with gcc under linux:</p> <p><img src="https://i.stack.imgur.com/HogK8.png" alt="main.c"></p> <p><img src="https://i.stack.imgur.com/n3S39.png" alt="main2.c"></p> <p><img src="https://i.stack.imgur.com/eD83p.png" alt="main3.c">   <br /> <em>In any case the statement of the prototype locally is of no use, because there is no call without parameters reference to this prototype will be remiss. If you use the system with "untyped formal parameter", for an external call, proceed to generate a declarative prototype data type.</em></p> <p>Like this:</p> <pre><code>int myfunc(int param); </code></pre>
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    1. POWhy does a function with no parameters (compared to the actual function definition) compile?
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    1. COGah! Don't post large screenshots unless you really need to...
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    2. COI have taken the trouble to optimize images for that the size in bytes of the images, was the minimum possible. I think the pictures can get a quick view of the lack of difference in the generated code. I've been testing out the code, generating real documentation of what it claimed and not just theorizing about the problem. but not all see the world the same way. I'm terribly sorry that my attempt to provide more information to the community to have bothered you so much.
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    3. COI'm pretty certain that an unspecified return type is always `int`, which is generally either the work-register size or 16 bits, whichever is smaller.
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