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#include <iostream>
#include <string>
using namespace std;
char s[20000], *p, a[5000], separator[] = " ";
int k = 0, i;
void separare();
void afisare();
int main()
{
	cout << "Sirul de nr:"; cin.get(s, 100, '\n');
	separare();
	afisare();
	system("pause");
	return 0;
}
void separare()
{
	p = strtok(s, separator);
	while (p)
	{
		strcpy(a[k], p);
		k++;
		p = strtok(NULL, separator);
	}
}
void afisare()
{
	int i;
	for (i = 0; i < k; i++)
		cout << a[i] << " ";
}

prog.cpp: In function ‘void separare()’:
prog.cpp:18:25: error: ‘strtok’ was not declared in this scope
  p = strtok(s, separator);
                         ^
prog.cpp:21:17: error: ‘strcpy’ was not declared in this scope
   strcpy(a[k], p);
                 ^

Standard output is empty