#include <stdio.h>
#pragma warning(disable:4996)

int main()
{
	int a,b=1,c=0;
	char d;
	while(1){
	printf("Hello!\n");
	printf("1) 사칙연산\n");
	printf("2) 팩토리얼\n");
	printf("3) 세제곱\n");
	scanf("%d",&a);

	if(a == 1)
	{
		while(1){
			scanf("%d",&b);
			if(b==-1)
			{
				break;
			}
			else
			{
			scanf("%c %d",&d,&c);
		switch(d){
			case '+':
				printf("%d\n",b+c);
				break;
			case '-':
				printf("%d\n",b-c);
				break;
			case '/':
				printf("%d\n",b/c);
				break;
			default:
				printf("%d\n",b*c);
				break;
			}
			}
		}
	}
	else if(a==2)
	{
		while(1)
			{
				
		scanf("%d",&c);
		if(c==-1)
		{
			break;
			
		}
		else
		{
		while(c>=1)
		{
			b *= c;
			c--;
		}
		printf("%d\n",b);
		b = 1;
		}
		}
	}
	else
	{
		while(1){
		scanf("%d",&b);
		if(b==-1)
		{
			break;
			
		}
		else
		{
		c = b*b*b;
		printf("%d\n",c);
		}
		}
	}
	}
	return 0;
}
#include <stdio.h>
#pragma warning(disable:4996)

int main()
{
	float i = 10;
	float b;
	while(i>-11)
	{
			if(i==0){
				i--;
				continue;
			}
			else
			{
			b = 10/i;
			printf("%f\n",b);
			i--;
			}
	}
	return 0;
}
#include <stdio.h>
#pragma warning(disable:4996)

int main()
{
	int a,b,c;
	scanf("%d %d",&a,&b);
	while(1)
	{
				if(a%b==0){
			printf("%d\n",b);
			break;
		} 
		if(a>=b)
		{
			c = b;
			b = a % b;
			a = c;
		}
		else
		{
			c = b;
			b = a;
			a = c;
			continue;
		}

			
	}
	return 0;
}

#include <stdio.h>
#pragma warning(disable:4996)

int main(void)
{
	
	printf("Hello!\n");
	printf("(1) 사칙연산\n");
	printf("(2) 팩토리얼\n");
	printf("(3) 세제곱\n");
	while (1)
	{
		int m;
		m = getchar();
		int a, b, d, e;
		char c;

		switch (m)
		{
		case '1':
			while (1)
			{
				scanf("%d", &a);
				if (a == -1)
					break;
				else
					scanf("%c %d", &a, &c, &b);
				switch (c)
				{
				case '+':
					printf("%d", a + b);
					break;
				case '-':
					printf("%d", a - b);
					break;
				case '*':
					printf("%d", a * b);
					break;
				case '/':
					printf("%d", a / b);
					break;
				}
			}
			break;
		case '2':
			while (1)
			{
				scanf("%d", &b);
				if (b == -1)
					break;
				else
				d = 2;
				e = 1;
				while (d <= b)
				{
					e = e * d;
					d++;
				}
				printf("%d", e);
			}
			break;
		case '3':
			while (1)
			{
				scanf("%d", &b);
				if (b == -1)
					break;
				else
				printf("%d", b*b*b);
			}
			break;
		}
	}
}

#include <stdio.h>
#pragma warning(disable:4996)

int main()
{
	float a =10, b = 11;
	while (b >= -10)
	{
		b--;

		if (b == 0)
			continue;
		printf("%f\n", a / b);
	}
	return 0;
}

#include <stdio.h>
#pragma warning (disable:4996)

int main()
{
	int a, b;
	scanf("GCD(%d, %d)", &a, &b);
	while (1)
	{
		int c = a;
		if (c % b == 0)
			break;
		a = b;
		b = c % b;

	}
	printf("%d", b);
	return 0;
}