#include <stdio.h>

int b;
void f1() {
	int a = 10;
	a++;
	printf("in f1: a = %d\n", a);
}

void f2() {
   b++;
   printf("in f2: b = %d\n", b);
}

char *f3(void) {
	static char str[20] = "a static variable";
	/* Normally str would not live outside the function
	 * it is a local variable for f3. However, static  
	 * will help us claim, the otherwise nonexistent value
	 */
	return(str);
}

int main(int argc, char *argv[]) {
	int a = 5;
	char *str = NULL;

	
	printf("Local variable a = %d\n", a);
	f1();
	printf("After first call: a = %d\n", a);
	f1();
	printf("After second call: a = %d\n", a);
	printf("\n");
	
	b = 5;
	printf("Global variable b = %d\n", b);
	f2();
	printf("After first call: b = %d\n", b);
	f2();
	printf("After second call: b = %d\n", b);
	printf("\n");
	
	printf("Before function call str = %s\n", str);
	str = f3();
	printf("After function call str = %s\n", str);

	return 0;
}