#include<stdio.h>
#include<string.h>

void change_const(const double *param_pointer){
	double *pe = (void*)param_pointer;
	*pe = 39;
}

void our_strcpy(char* dest, char* source){
	for( ; *source; *dest++ = *source++);
	return; // return nothing, because the return type is void

	// Long version
	while(*source != 0){
		*dest = *source;
		dest++;
		source++;
	}
}

int main(){
	int a = 5;
	int *pa = &a;

	pa = 10;
	printf("a = %d\n", a);
	
//	*pa = 10; // causes segfault
//	printf("a = %d\n", a);

	char animal[] = "dugong";
	char copy[32];
	our_strcpy(copy, animal);

	printf("Copy is %s\n", copy);

	double e = 2.71;
	printf("e = %lf\n", e);
	e = 271;
	change_const(&e);
	printf("e = %lf\n", e);



	return 0;
}