What is the use of local variables in C language

This article mainly shows you "what is the use of local variables in c language". The content is simple and clear, and I hope it can help you solve your doubts. Let me lead you to study and learn this article "what is the use of local variables in c language?"

1. The variable defined inside the function is called local variable, and its scope is limited to the interior of the function. It is invalid after leaving the function, and an error is reported after use.

2. Local variables can only be used within the function. They are not valid after leaving the function. If you use them again, you will report an error.

Example

# include int F1 (int a) {int bscorec; / / return bscorec is valid only in function F1 ();} int main () {int m = 5; int n = 6; / / mpennvalid printf is only valid in function main () ("m =% d n =% d\ n", mdjinn); printf ("b =% d c =% d\ n", bMagee c) / / bint main c does not declare return 0 in the function;} / * output: main.cpp: In function 'int main ()': main.cpp:11:29: error:'b' was not declared in this scope 11 | printf ("b =% d c =% d\ n", bMagnec) | | ^ main.cpp:11:31: error:'c 'was not declared in this scope 11 | printf ("b =% d c =% d\ n", bPowerc); | ^ * / above is all the content of the article "what is the use of local variables in c language". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!