C character set and keywords | Identifiers

C character set and catchphrases 

Identifiers 

Identifiers are names that are given to different program components, for example, factor, works and clusters. 

Identifiers comprise of letters and digits, in any request, then again, actually the primary character must be a letter.; 

Both upper-and lowercase letters are allowed, however basic use supports the utilization of lowercase letters for most kinds of identifiers. Upper-and lowercase letters are not compatible. 

The underscore (_) character can likewise be incorporated, and is viewed as a letter. An underscore is frequently utilized amidst an identifier. 

An identifier may likewise start with an underscore, however this is once in a while done practically speaking. 

The accompanying names are legitimate identifiers: 

x 

y12 

sum_1 

tax_rate 

region 

_temperature