What is the use of the static keyword in C?

A static local variable is created once and keeps its value between function calls. A static global variable or function is visible only in its own file.

#include <stdio.h>

void count(void) {
    static int n = 0;
    n++;
    printf("%d ", n);
}

int main(void) {
    count(); count(); count();
    printf("\n");
    return 0;
}

Output:

A normal local variable would print 1 every time.

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