Answer: Yes. C language instructions/commands/functions and everything used in C program are case sensitive .
Read moreWhich language is not case sensitive?
In programming languages Others are case-insensitive (i.e., not case-sensitive), such as ABAP, Ada, most BASICs (an exception being BBC BASIC), Fortran, Ring, SQL (for the syntax, and for some vendor implementations, e.g. Microsoft SQL Server, the data itself) and Pascal.
Read moreWhy is C++ case sensitive?
C++ is a programming language that is case-sensitive, so all keywords must be minuscule. As it handles upper and lower-case characters differently , C++ is case sensitive. So, C++ is case sensitive.25 Kas 2019
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