C++
#include<iostream>
using namespace std;
void mice();
void howrun();
int main() {
mice();
mice();
howrun();
howrun();
}
void mice() {
cout << "Three Blind mice" << endl;
}
void howrun() {
cout << "See how they run" << endl;
}
输出：
Three Blind mice Three Blind mice See how they run See how they run
二、用户输入年龄，显示该年龄包含多少个月？
#include<iostream>
using namespace std;
int monthnumber(int);
int main() {
cout << "please input your age:" << endl;
int age;
cin >> age;
int month = monthnumber(age);
cout << month << "monthes" << endl;
return 0;
}
int monthnumber(int age) {
return age * 24;
}
输出：
please input your age: 24 576monthes
三、用户输入小时和分钟数，main函数中，将这两个参数传递给一个void函数，并显示：
#include<iostream>
using namespace std;
void showtime(int, int);
int main() {
int hour;
int minute;
cout << "Enter hour: ";
cin >> hour;
cout << "Enter minutes: ";
cin >> minute;
showtime(hour,minute);
}
void showtime(int hour, int minute) {
cout << "Time " << hour << " : " << minute << endl;
}
输出：
Enter hour: 3 Enter minutes: 15 Time 3 : 15
四、每种数据类型所占字节数以及最大值
#include<iostream>
#include<climits>
using namespace std;
int main() {
short n_short = SHRT_MAX;
int n_int = INT_MAX;
long n_long = LONG_MAX;
long long n_long_long = LLONG_MAX;
cout << " short: " << sizeof(n_short) << " bytes." << endl;
cout << " int: " << sizeof(n_int) << " bytes." << endl;
cout << " long: " << sizeof(n_long) << " bytes." << endl;
cout << " long long: " << sizeof(n_long_long) << " bytes." << endl;
cout << "max num:" << endl;
cout << "short: " << n_short << endl;
cout << "int: " << n_int << endl;
cout << "long: " << n_long << endl;
cout << "long long: " << n_long_long << endl;
cout << "min: " << INT_MIN << endl;
cout << "Bits per byte: " << CHAR_BIT << endl;
}
输出：
short: 2 bytes. // short int 占2个字节，每个字节8位，总计16位 int: 4 bytes. // int 占 4个字节，每个字节8位，总计32位 long: 8 bytes. // .... long long: 8 bytes. max num: short: 32767 int: 2147483647 long: 9223372036854775807 long long: 9223372036854775807 min: -2147483648 Bits per byte: 8
五、无符号的与有符号的对比：
无符号的说白了就是增大数据可表示范围，注意：：该值不能表示复数，仅仅表示正数
#include<iostream>
#include<climits>
#define ZERO 0
using namespace std;
int main() {
short sam = SHRT_MAX;
unsigned short sue = sam;
cout << " sam value is: " << sam << ", sue vale is: " << sue << endl;
sam += 1;
sue += 1;
cout << " sam value is: " << sam << ", sue vale is: " << sue << endl;
sam = ZERO;
sue = ZERO;
cout << " sam value is: " << sam << ", sue vale is: " << sue << endl;
sam -= 1;
sue -= 1;
cout << " sam value is: " << sam << ", sue vale is: " << sue << endl;
return 0;
}
输出：
sam value is: 32767, sue vale is: 32767 sam value is: -32768, sue vale is: 32768 sam value is: 0, sue vale is: 0 sam value is: -1, sue vale is: 65535
六、如何十进制、十六进制、十进制显示数据
#include<iostream>
#include<climits>
using namespace std;
int main() {
int chest = 42;
int waist = 42;
int inseam = 42;
cout << "10 jinzhi: chest " << chest << endl;
cout << hex;
cout << "16 jinzhi: waist " << waist << endl;
cout << oct;
cout << "8 jinzhi: inseam " << inseam << endl;
return 0;
}
输出：
10 jinzhi: chest 42
16 jinzhi: waist 2a
8 jinzhi: inseam 52
七、cout默认将十六进制、八进制的数据以十进制的形式输出；
#include<iostream>
#include<climits>
using namespace std;
int main() {
int chest = 42;
int waist = 0x42;
int inseam = 042;
cout << "10 jinzhi: chest " << chest << endl;
cout << "16 jinzhi: waist " << waist << endl;
cout << "8 jinzhi: inseam " << inseam << endl;
return 0;
}
输出：
10 jinzhi: chest 42 16 jinzhi: waist 66 8 jinzhi: inseam 34
八、cout char类型
#include<iostream>
#include<climits>
using namespace std;
int main() {
char ch;
cout << "please input: " << endl;
cin >> ch;
cout << "character is: " << ch << endl;
return 0;
}
输出：
please input: M character is: M
输入字符M，cin首先将M转换为77，输出时，将77转换为M；
也就是说，cout和cin的行为都是由变量类型引导的；
九、char类型的计算；cout.put使用
#include<iostream>
#include<climits>
using namespace std;
int main() {
char ch;
int i;
cout << "please input ch: " << endl;
cin >> ch;
i = ch;
cout << "character: " << ch << ", code: " << i << endl;
ch += 1;
i = ch;
cout << "character: " << ch << ", code: " << i << endl;
cout << "displaying char in using cout.put(ch): ";
cout.put(ch);
cout << endl;
cout << "displaying a char constant in using cout.put: ";
cout.put('i');
cout << endl;
return 0;
}
输出：
please input ch: M character: M, code: 77 character: N, code: 78 displaying char in using cout.put(ch): N displaying a char constant in using cout.put: i
十、bool
#include<iostream>
#include<climits>
using namespace std;
int main() {
bool right = true;
bool wrong = false;
cout << "bool: " << right << ", " << wrong << endl;
int righ = true;
int wron = false;
cout << "int: " << righ << ", " << wron << endl;
bool ri = -100;
bool wr = 0;
cout << "bool: " << ri << ", " << wr << endl;
return 0;
}
输出：
bool: 1, 0 int: 1, 0 bool: 1, 0
十一、const 限定符
与#define相比，可以限定作用域；可以适用于更复杂的数据类型；
#include<iostream>
#include<climits>
using namespace std;
const int Year = 2016;
int main() {
const int Months = 12;
cout << Year << " "<< Months << endl;
return 0;
}
输出：
2016 12
十二、