static

#include <stdio.h>
#include <stdlib.h>

void ppr()
{
    int a = 0;
    static int b = 0;

    a++;
    b++;

    printf("a = %d, b = %d\n", a, b);
}

int main()
{

    for(int i = 0; i<10; ++i) ppr();

    return 0;
}

/*
output:

a = 1, b = 1
a = 1, b = 2
a = 1, b = 3
a = 1, b = 4
a = 1, b = 5
a = 1, b = 6
a = 1, b = 7
a = 1, b = 8
a = 1, b = 9
a = 1, b = 10

*/