#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <string.h>
#include <math.h>
#include <stdlib.h>

main()
{
	printf("%f\n", pow(2, 3));
	printf("%f\n", sqrt(25));
	printf("%d\n", abs(-20));
	char a[] = "ad";
	char b[] = "ac";
	printf("%d\n", strcmp(a, b));
	strcpy(a, b);
	printf("%d\n", strcmp(a, b));
	char c[] = "123";
	char d[] = "456";
	printf("%d\n", atoi(c) + atoi(d));
	char e[] = "12.3";
	char f[] = "45.6";
	printf("%f\n", atof(e) + atof(f));
}