Task: Using Variables

Access the directory tasks/vars-obs/support/. We want to track the use of global variables, both exported and non-exported.

In the hidden.c file, we have the static (non-exported) variable hidden_value. This variable is modified and accessed using non-exported functions: init(), get(), set().

In the plain.c file, we have the exported variable age. This variable can be modified and accessed directly.

These variables are used directly (age) or indirectly (hidden_value) in the main.c file. To use them, the functions and variables are declared in the ops.h file. A function is declared by specifying the header. A variable is declared by prefixing it with extern.

Modify main.c such that hidden_value is set to 10 and age is set to 33.

Checker: To test the implementation, enter the tests/ directory and run:

./run_all_tests.sh

In case of a correct solution, you will get this output:

./run_all_tests.sh

test_vars-obs                    ........................ passed ...  100

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Total:                                                             100/100

If you’re having difficulties solving this exercise, go through this reading material.