Basic Data Types

Some C++ data types, their format specifiers, and their most common bit widths are as follows:

• Int ("%d"): 32 Bit integer
• Long ("%ld"): 64 bit integer
• Char ("%c"): Character type
• Float ("%f"): 32 bit real value
• Double ("%lf"): 64 bit real value

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Reading
To read a data type, use the following syntax:

scanf("`format_specifier`", &val)

For example, to read a character followed by a double:

char ch;
double d;
scanf("%c %lf", &ch, &d);

For the moment, we can ignore the spacing between format specifiers.

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Printing
To print a data type, use the following syntax:

printf("`format_specifier`", val)

For example, to print a character followed by a double:

char ch = 'd';
double d = 234.432;
printf("%c %lf", ch, d);

Note: You can also use cin and cout instead of scanf and printf; however, if you are taking a million numbers as input and printing a million lines, it is faster to use scanf and printf.

Input Format

Input consists of the following space-separated values: int, long, char, float, and double, respectively.

Output Format

Print each element on a new line in the same order it was received as input. Note that the floating point value should be correct up to 3 decimal places and the double to 9 decimal places.

Sample Input

3 12345678912345 a 334.23 14049.30493

Sample Output

3
12345678912345
a
334.230
14049.304930000

#include<iostream>
#include<iomanip>
using namespace std;
int main()
{
	int a;
	long long b;//變量數據類型的選擇：應該使用long long int，又可簡寫爲long long
	char c;
	float d;
	double e;
	cin >> a >> b >> c >> d >> e;
	cout << a << endl;
	cout << b << endl;
	cout << c << endl;
	/*咱們在這裏主要用到其中兩個：fixed 和 showpoint。
首先說fixed，以定點方式顯示實數，即顯示整數部分*/
	cout <<setiosflags(ios::fixed)<< setprecision(3)<<d<< endl;
	cout<<setiosflags(ios::fixed)<<setprecision(9) <<e;
	return 0;
}

主要考察基本變量吧，注意long long ；