Why do you need data types in c language?

Answer 1

All programming languages require types. Some are dynamically-typed while others are statically-typed. C is a statically-typed language. Static-typing means values are bound to types at compile time, thus optimising storage requirements and rejecting invalid operations at compile time. Dynamic-typing means values are bound to types at runtime. While dynamic-typing is more flexible and generally easier to work with, that flexibility comes at a cost in terms of performance and maintenance. Invalid operations will result in runtime errors but, even if no errors occur, the runtime must still test for them, resulting in decreased performance and increased code size. Since C can eliminate type-based errors at compile time, most runtime-checks become redundant, code is more compact and performance is optimal.