Solution for Exercise 10-5
ex1005
#include <stdio.h> void vegas(void); int main() { int a; a = 365; printf("In the main function, a=%d\n",a); vegas(); printf("In the main function, a=%d\n",a); return(0); } void vegas(void) { int a; a = -10; printf("In the vegas function, a=%d\n",a); }
Notes
* Variables inside one function don't affect variables inside another, even when given the same names.
* You don't need to skimp on variables in a function. If the function needs a dozen variables to do its thing (to funct), declare a dozen variables.
* I tend to re-use short variable names more than I do long ones. For example, I often use x
in a for loop or ch
when reading a character. Those variable names are used in functions and their contents are always considered local. I dub more important variables with specific names, such as status
or current_line
or total
. Even when such variables are used only in a function, I don't re-use their names anywhere else in the code. It's all personal preference, really.
* While I use the term local variable to refer to variables used in a function, it's not an official C language term. All variables in C are local because they are all used within a function. The exception is the external or global variable, which is covered in Chapter 16.
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