Fundamental data Types in C Programming Language

Fundamental data types include the data types at the lowest level, i.e. those which are used for actual data representation in the memory. All others data types are based on the fundamental data types.

The fundamental data types are:

char - for characters and strings
int - for integers
float - for numbers with decemals

Since the above data types are fundamentals, i.e. at the machine level, the storage requirement is hardware dependent.