Why it doesn't work properly when I put the int into function and function2?
Code:#include <stdio.h> #include <stdlib.h> void function () { int a, b, c; printf("Input 3 intergers: "); scanf("%d %d %d",&a, &b, &c); } void function2 () { int a, b, c; printf("%d %d %d\n",a, b, c); } int main(void) { function (); function2 (); system("pause"); }
The variables a,b, and c in function() are not the same variables a,b, and c as in function2().
You need to explicitly pass arguments between functions, if that is what you intend to do. Just putting two sets of variables with the same name, in two different functions, does not pass values of variables between those functions.
However you're trying to learn C (be it from a textbook, an online tutorial, or in a teacher) you need to do a bit more work to understand what is actually required. I've seen some rotten textbooks, tutorials, help files, and even bad teachers in my time .... but all of them get this sort of thing right, because it is pretty elementary to C. If you're not understanding yet, then you need to spend more time going through the materials you have, or listening to what your teacher teaches.
Hi ulti-killer,
here you can see one way it would work.
C Tutorial – Functions and Global/Local variables | CodingUnit Programming Tutorials
But using global variables isn't a good thing. For small programs you can use them but it's better to avoid using global variables whenever you can.
I use global variables to pass values of variables between those functions. If global variables isn't a good thing, is there a better solution?
Code:#include <stdio.h>#include <stdlib.h> int a, b, c; void function () { printf("Input 3 intergers: "); scanf("%d %d %d",&a, &b, &c); } void function2 () { printf("%d %d %d\n",a, b, c); } int main(void) { function (); function2 (); system("pause"); }
In this instance better solution would be to pass the variables, for example;
Code:void fee(int &a, int &b, int &c) // note pass by reference not value. { a = 1; b = 2; c = 3; } void fii(int a, int b, int c) { printf("%d %d %d\n",a, b, c); } int main() { int a,b, c; fee(a, b, c); fii(a,b, c); return 0; }
Tropod, your fee() function is C++, not C. C does not support pass by reference like that. Try converting your code to C.
And, whatever you do, add #include <stdio.h> to the top of the file, so you can be sure printf() will work correctly.
