static

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

void ppr1()
{
    int a = 0;
    static int b = 0;

    a++;
    b++;

    printf("ppr1: a = %d, b = %d\n", a, b);
}

void ppr2()
{
    int a = 0;
    static int b = 0;

    a++;
    b++;

    printf("ppr2: a = %d, b = %d\n", a, b);
}

int main()
{

    for(int i = 0; i<2; ++i) ppr1();

    printf("\n");

    for(int i = 0; i<3; ++i) ppr2();

    printf("\n");

    for(int i = 0; i<2; ++i) ppr1();

    printf("\n");

    for(int i = 0; i<3; ++i) ppr2();

    printf("\n");

    return 0;
}

/*
output:

ppr1: a = 1, b = 1
ppr1: a = 1, b = 2

ppr2: a = 1, b = 1
ppr2: a = 1, b = 2
ppr2: a = 1, b = 3

ppr1: a = 1, b = 3
ppr1: a = 1, b = 4

ppr2: a = 1, b = 4
ppr2: a = 1, b = 5
ppr2: a = 1, b = 6


*/