Does this look like good design, or wasteful?

Just would like an opinion on whether this is good design or not.
Im trying to tuck things away into their own functions, and keep to good programming techniques.
What do you think?



#include <stdio.h>


void Menu()
{
printf("\nChoose an option.\n");
printf("\n1:Print name.");
printf("\n2:Print time.");
printf("\n3:Input number between 1 - 50, and list.");
printf("\n4:Quit\n");

return;
}


int Input(int &a)
{
scanf("%d",&a);
return a;

}


void PrintName()
{
printf("\nCodeGibbon\n");
return;

}


void PrintTime()
{
printf("\nTime: Now\n");
return;

}

void CheckInput(int &a, int &z)
{
if (a >= 0 && a <= 50)
{
printf("Valid Input\n");
z = 1;
return;
}
printf("Invalid Input\n");
z = 0;
return;
}


void ListNumbers()
{

int b = 0;
int z;
printf("\nEnter Number between 1 and 50\n");
b = Input(b);
CheckInput(b,z);



if (z == 1)
{


for (int i = 0; i <= b; i++ )
{
printf("%d ", i);


}
}


return;

}




int main()
{
int a;

while (a != 4)
{



Menu();
a = Input(a);


switch(a)
{
case 1:
PrintName();

break;


case 2:
PrintTime();

break;

case 3:
ListNumbers();

break;

//case 4:

// break;
}





}

return 0;
}

Your "Input" function seems to be overkill, just use the scanf directly instead. Maybe if you were collecting multiple inputs and validating them it should be in its own function but as it stands, I wouldn't keep it.

I would also make the CheckInput function return if the input is valid or not instead requiring the output variable to passed in. And if you did that I would rename the function to "IsInputValid" to better convey what the function is determining.

I also notice you are using pass by reference which means you must be compiling this as C++ code. If you are doing that why not make your life a little easier and using cin and cout instead of printf and scanf? If you are actually going to stick with using C++ code there would be a few other things I would change as well.

Or pass by pointer and compile as C code?

I always put comments in my code so that anyone else who happens to read it will know what the hell is going on without having to squint their eyes to read every single line of code. That seems to be a good structural technique to add in.