How to share a variable between two functions in C?

Question

In C, suppose var1 is a variable in foo1() and foo2() wants to access var1, however, foo1() doesn\'t call foo2(), so we can\'t pass it by parameter. At the same time, only foo1(

Answer 1

You need to declare var1 outside the scope of the functions and then send it as a parameter to both. Alternatively, declare it as a global variable.