Objective

Implement an allocated counter whose fields stay private to meter.c.

Steps

• Write meter.h and meter.c.
• Keep struct s_meter out of meter.h. The header exposes only the incomplete meter type and the four functions.
• meter_create allocates one meter, stores initial, and returns NULL if allocation fails.
• meter_destroy releases the meter. Passing NULL is valid.
• meter_add adds amount to the stored value.
• meter_value returns the stored value.
• Each call to meter_create owns a separate allocation.
• Use only malloc and free.

Objective

Implement an allocated counter whose fields stay private to meter.c.

Steps

• Write meter.h and meter.c.
• Keep struct s_meter out of meter.h. The header exposes only the incomplete meter type and the four functions.
• meter_create allocates one meter, stores initial, and returns NULL if allocation fails.
• meter_destroy releases the meter. Passing NULL is valid.
• meter_add adds amount to the stored value.
• meter_value returns the stored value.
• Each call to meter_create owns a separate allocation.
• Use only malloc and free.