Run two+ void functions at once?

[ExSanity]

So currently i want to run two functions at once but idk if that's possible without threads

void runbot4() {
	printf("Second one started");
	Sleep(1000);
	printf("I run while the Add Bot Adds!");
}
void addbot1() {
	printf("i'm the first bot");
	int z = x + y;
	printf("Z Equals: %d", z);

}

So could i have these both run at the same time without having to use threads and just have int main start both or would i have to start one and have the other run on a thread?

[jonnin]

You can't do it without threads or similar. There are similar to thread event-driven constructs that can do it also. None of this is really C++ language, more of hooks to OS.

[gunnerfunner]

without having to use threads

why?