3.example

Example 1

整型数据类型存储空间的大小。

[+]

#include <iostream>
#include <cstdio>
using namespace std;

int main(){
	
	char a;
	cout << "char size is " << sizeof(a) << " bytes." << endl;
	
	short b;
	cout << "short size is " << sizeof(b) << " bytes."  << endl;

	int c;
	cout << "int size is " << sizeof(c) << " bytes."  << endl;

	long d;
	cout << "long size is " << sizeof(d) << " bytes."  << endl;

	long int e;
	cout << "long int size is " << sizeof(e) << " bytes."  << endl;

	long long f;
	cout << "long long size is " << sizeof(f) << " bytes."  << endl;

	long long int g;
	cout << "long long int size is " << sizeof(g) << " bytes."  << endl;
	
	return 0;
}

Example 2

大小写字母转换。

[+]

#include <iostream>
#include <cstdio>
using namespace std;

int main(){
	
	char c1='a';
	char c2='A';
	
	cout << c1 << " " << c2 << endl;
	c1 = c1 -32;
	c2 = c2 + 32;
	cout << c1 << " " << c2 << endl;
	
	return 0;
}

Exercise 1

整型数据类型存储空间大小，http://noi.openjudge.cn/ch0102/01/[+]

#include<iostream>
using namespace std;

int main()
{
	int i;
	short s;
	
	cout << sizeof(i)<< " " << sizeof(s) << endl; 
	
	return 0;
}

浮点型数据类型存储空间大小，http://noi.openjudge.cn/ch0102/02/[+]

#include<iostream>
using namespace std;

int main()
{
	float f;
	double d;
	
	cout << sizeof(f)<< " " << sizeof(d) << endl; 
	
	return 0;
}

其他基本数据类型存储空间大小，http://noi.openjudge.cn/ch0102/03/[+]

#include<iostream>
using namespace std;

int main()
{
	bool b;
	char c;
	
	cout << sizeof(b)<< " " << sizeof(c) << endl; 
	
	return 0;
}

类型转换1，http://noi.openjudge.cn/ch0102/04/[+]

#include<iostream>
using namespace std;

int main()
{
	int a = 32768;
	short b = a;
	
	cout << "D C" <<endl;
	//printf("%d %d\n", a, b);
	
	return 0;
}

类型转换2，http://noi.openjudge.cn/ch0102/05/[+]

#include<iostream>
using namespace std;

int main()
{
	double a = 1.000000001;
	float b = a;
	
	cout << "F E" <<endl;
	//printf("%.9f %.9f\n", a, b);
	
	return 0;
}

浮点数向零舍入，http://noi.openjudge.cn/ch0102/06/[+]

#include <iostream>
using namespace std;

int main(){
	float a;
	
	cin >> a;
	cout << (int)a << endl;
	
	return 0;
}

打印ASCII码，http://noi.openjudge.cn/ch0102/07/[+]

#include<iostream>
using namespace std;

int main()
{
	char c;
	scanf("%c",&c);
	cout << (int)c << endl;
	
	return 0;
}

打印字符，http://noi.openjudge.cn/ch0102/08/[+]

#include<iostream>
using namespace std;

int main()
{
	int c;
	cin >> c;
	cout << (char)c << endl;
	
	return 0;
}

整型与布尔型的转换，http://noi.openjudge.cn/ch0102/09/[+]

#include<iostream>
using namespace std;

int main()
{
	int i;
	cin >> i;
	bool b = i;
	int j = b;
	cout << j << endl;
	
	return 0;
}

Hello, World!的大小，http://noi.openjudge.cn/ch0102/10/[+]

#include<iostream>
using namespace std;

int main()
{
	
	cout << sizeof("Hello, World!") << endl; 
	
	return 0;
}

Example 3

利用getchar函数接收键盘输入

[+]

#include <iostream>
#include <cstdio>
using namespace std;

int main(){
	
	char ch = getchar();
	cout << "input=" << ch << endl;
	
	return 0;
}

Example 4

利用putchar函数输出字符

[+]

#include <iostream>
#include <cstdio>
using namespace std;

int main(){
	char c='B';
	
	putchar(c);
	putchar('\x42');
	putchar(0x42);
	putchar(66);	
	
	return 0;
}

Example 5

某幼儿园里，有5个小朋友编号为1、2、3、4、5，他们按自己的编号顺序围坐在一张圆桌旁。
他们身上都有若干个糖果（键盘输入），现在他们做一个分糖果游戏。从1号小朋友开始，将自己的糖果均分三份（如果有多余的糖果，则立即吃掉），自己留一份，其余两份分给他的邻居的两个小朋友。接着2号，3号，4号，5号小朋友同样这么做。问一轮后，每个小朋友手上分别有多少糖果？

[+]

#include <iostream>
#include <cstdio>
using namespace std;

int main(){
	int a,b,c,d,e;
	
	scanf("%d%d%d%d%d",&a,&b,&c,&d,&e);
	a=a/3;b=b+a;e=e+a;	
	b=b/3;c=c+b;a=a+b;	
	c=c/3;d=d+c;b=b+c;	
	d=d/3;e=e+d;c=c+d;	
	e=e/3;a=a+e;d=d+e;	
	printf("%5d%5d%5d%5d%5d\n",a,b,c,d,e);
	
	return 0;
}

Exercise 2

输出保留3位小数的浮点数，http://noi.openjudge.cn/ch0101/04/[+]

#include <iostream>
using namespace std;

int main() {
	float a;
	
	cin >> a ;
	printf("%.3f",a);

	return 0;
}

输出保留12位小数的浮点数，http://noi.openjudge.cn/ch0101/05/[+]

#include <iostream>
using namespace std;

int main() {
	double a;
	
	cin >> a ;
	printf("%.12f",a);

	return 0;
}

空格分隔输出，http://noi.openjudge.cn/ch0101/06/[+]

#include <iostream>
using namespace std;

int main() {
	char a;
	int b;
	float c;
	double d;
	
	cin >> a >> b >> c >> d;
	printf("%c %d %f %f",a,b,c,d);

	return 0;
}

输出浮点数，http://noi.openjudge.cn/ch0101/07/[+]

#include <iostream>
using namespace std;

int main() {
	double a;
	
	cin >> a ;
	printf("%f\n",a);
	printf("%.5f\n",a);
	printf("%e\n",a);
	printf("%g\n",a);

	return 0;
}

字符菱形，http://noi.openjudge.cn/ch0101/09/[+]

#include <iostream>

int main() {
	char ch;
	scanf("%c", &ch);
	printf("  %c\n",ch);
	printf(" %c%c%c\n",ch,ch,ch);
	printf("%c%c%c%c%c\n",ch,ch,ch,ch,ch);
	printf(" %c%c%c\n",ch,ch,ch);
	printf("  %c\n",ch);
	
	return 0;
}

超级玛丽游戏，http://noi.openjudge.cn/ch0101/10/[+]

#include <iostream>
using namespace std;

int main(){
	cout << "                ********" << endl;
	cout << "               ************" << endl;
	cout << "               ####....#." << endl;
	cout << "             #..###.....##...." << endl;
	cout << "             ###.......######              ###                 ###           ###           ###" << endl;
	cout << "                ...........               #...#               #...#         #...#         #...#" << endl;
	cout << "               ##*#######                 #.#.#               #.#.#         #.#.#         #.#.#" << endl;
	cout << "            ####*******######             #.#.#               #.#.#         #.#.#         #.#.#" << endl;
	cout << "           ...#***.****.*###....          #...#               #...#         #...#         #...#" << endl;
	cout << "           ....**********##.....           ###                 ###           ###           ###" << endl;
	cout << "           ....****    *****...." << endl;
	cout << "             ####        ####" << endl;
	cout << "           ######        ######" << endl;
	cout << "##############################################################              ##################################" << endl;
	cout << "#...#......#.##...#......#.##...#......#.##------------------#              #...#......#.##------------------#" << endl;
	cout << "###########################################------------------#              ###############------------------#" << endl;
	cout << "#..#....#....##..#....#....##..#....#....#####################              #..#....#....#####################" << endl;
	cout << "##########################################    #----------#                  ##############    #----------#" << endl;
	cout << "#.....#......##.....#......##.....#......#    #----------#                  #.....#......#    #----------#" << endl;
	cout << "##########################################    #----------#                  ##############    #----------#" << endl;
	cout << "#.#..#....#..##.#..#....#..##.#..#....#..#    #----------#                  #.#..#....#..#    #----------#" << endl;
	cout << "##########################################    ############                  ##############    ############" << endl;

	return 0;
}

辽师张大为@https://daweizh.github.io/csp/