#include <stdio.h>
int a,b=5,c;
//global variable a=0,b=5 and c=0 (a and c initialized by bss)
 
int main(void) {
	int b,c;
	//local b initialized local c initialised (local c=0)
	a=20;
	//(global a updated) global a=20 global b=5 global c=0 
	b=function1();
	//local b=output of function 1 local b=25
	function3();
	//printf("a= %d\nb= %d\nc= %d\n",a,b,c); (commented out)
	//This prints local values of c (from this block main function and global of a) 
	return 0;
}
 
int function1(){
	int a=50;
	int b=20;
	//global a=20 global b=5 global c=0
	//local a and b initialized local a=50 local b=20
	c=function2(b); //local b sent as parameter of function2 (b=20)
	//global c updated global c= output of function2 global c=25
	return c;
}
int function2(int b){
	//global a=20 global b=5 global c=0 
	b=a+5;
	//local b= global a + 5 
	return b;
}
int function3(){ ///prints all global values
	printf("a= %d\nb= %d\nc= %d\n",a,b,c);
}

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