C language is a process-oriented computer programming language, which is different from object-oriented programming languages such as C++ and Java. The design goal of C language is to provide a programming language that can compile and process low-level memory in a simple way, only generate a small amount of machine code, and does not need any running environment support at runtime.
C language is faster than assembly language in describing problems, less workload, good readability, easy debugging, modification and transplantation, and the code quality is equivalent to that of assembly language. Generally speaking, C language is only less efficient than the target program generated by assembly language code 10% to 20%. So C language can write system software.
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Constants and variables
Constants have unchangeable values, and symbolic constant names are usually capitalized.
A variable is a quantity whose value can be changed under the name of an identifier. An identifier is a series of letters, numbers or underscores that begin with a letter or underscore. Please note that the first character must be a letter or an underscore, otherwise it is an illegal variable name. Variables are assigned corresponding storage locations at compile time.
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If the variable name is followed by a number bracket, the declaration is an array declaration. Strings are also arrays. They end the array with ASCII NULL. It should be noted that the index values in parentheses are counted from 0.