c - Cannot access variable from two scopes outside the current scope? -
some super easy test codes here elaborate question:
#include <stdio.h> #include <string.h> #include <stdlib.h> void prompt(); void func(); int main() { char* arr = "hello"; while(1) { prompt(); } return 0; } void prompt() { func(); } void func() { char* data = null; data = arr; } so can see, define variable arr in main() function
and code goes inside
while()loop,in goes inside function called
prompt(),in goes inside function called
func(),- in want access variable
arrdefined earlier.
- in want access variable
but, when try compile snippet of code (using gcc), got error telling me
error:'arr' undeclared (first used in function)`.
also, got warning telling me
warning: unused variable 'arr'.
so weird...any idea?
you have 2 options
make variable arr global (as mentioned sourav)
pass pointer arr variable prompt() function, , func(). can use in func().
which 1 choose depends on task on hand , complexity of project.
if simple project , 1 off, may use global.
however, project complexity increases , if going doing @ multiple locations, suggest take effort , go option 2.
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