情報処理実習 Lecture 6 データ型

.Lecture6.md

sample

1.cpp

#include <stdio.h>

char switch_case(char c)
{
	return c + ('a' - 'A') * (('A' <= c && c <= 'Z') - ('a' <= c && c <= 'z'));
}

int main()
{
	char c;
	printf("input charactor : ");
	scanf("%c", &c);

	printf("%c --> %c\n", c, switch_case(c));

	return 0;
}

2.cpp

#include <stdio.h>

char toascii(int number)
{
	return (unsigned int)number < 10 ? '0' + number : '0';
}

int main()
{
	for(int i=0; i<10; i++){
		char c = toascii(i);
		printf("%c", c);
	}
	printf("\n");

	return 0;
}

3.cpp

#include <stdio.h>

struct Point3d
{
	double x;
	double y;
	double z;
	void print();
};

double dot_product(const Point3d& p1, const Point3d& p2)
{
	return p1.x*p2.x + p1.y*p2.y + p1.z*p2.z;
}

Point3d cross_product(const Point3d& p1, const Point3d& p2)
{
	Point3d rtn;

	rtn.x = p1.y*p2.z - p1.z*p2.y;
	rtn.y = p1.z*p2.x - p1.x*p2.z;
	rtn.z = p1.x*p2.y - p1.y*p2.x;
	
	return rtn;
}

void Point3d::print()
{
	printf("(%.2f, %.2f, %.2f)\n", x, y, z);
}

int main()
{
	Point3d p1 = {1, 0, 0};
	Point3d p2 = {0, 1, 0};

	printf("p1 = ");
	p1.print();

	printf("p2 = ");
	p2.print();

	printf("p1·p2 = %f\n", dot_product(p1, p2)); //⇧ + ⌥ + 9

	printf("p1 × p2 = ");
	cross_product(p1, p2).print();
	printf("p2 × p1 = ");
	cross_product(p2, p1).print();

	return 0;
}

q4.cpp

#include <stdio.h>

int atoi(char c)
{
	int x = c - 0x30;
	return x;
}

int cubic(int n)
{
	return n*n*n;
}

int main(void)
{
	char c = 0;

	printf("Input a number: ");
	scanf("%c", &c);

	int n = atoi(c);
	int x = cubic(n);

	printf("%d powered by 3 is %d\n", n, x);
}