Basic input and output

Of all the programs in CPP, the most important is always two points: input and output.

Next, we'll familiarize ourselves with the input and output of the CPP using an example.

For example, enter two numbers, output their and:

#include <iostream>//use Cin,cout to call iostream library or compile error

using namespace Std;

the int main ()//main program function, which is owned in all CPP programs, is the starting point for the CPP program to run

{

int A, B; Define shaping variables A, b

cin>>a>>b; Input A and B

cout<<a+b; Output of A+b and

return 0; The return statement of main function main (), which represents the end of the program

}

Description:

1: #include <iostream>

using namespace Std;

int main ()

{

return 0;

These statements are the framework of all CPP programs, and beginners must keep in mind that recite!!!

2: About CPP Program input: In CPP language input is generally used cin.

3: about the output of the CPP program: Enter the general use cout in the CPP language.

4: About CIN: Use ">>" connection between number and number (characters and characters) when using CIN for input (two greater than sign)

4: About cout: When using cout to output, in the number and number (character and character) between the need for "<<" connection (two less than the number), if the output is a single character, enclosed in one or double quotation marks, such as cout<< ' K ';  cout<< "K";   。 If the output is multi-character, you must enclose it in double quotation marks, as

cout<< "yes";   。      If the output is an expression, do not add any symbols. PS: The space is "" or "; Change behavior <<endl;.

5:cpp arithmetic operators: + (plus),-(minus), * (multiply),/(except),% (for redundancy)

Example: 1+4=5

60-32=28

4*18=72

9/3=3 14/4=3 (The division operation of CPP will automatically remove decimals and become divisible)

17%4=1 (this is for redundancy)

Let's take a look at two more examples:

#include <iostream>

using namespace Std;

int main ()

{

int a,b,c;

cin>>a>>b>>c;

cout<<a*b%c;

return 0;

}

#include <iostream>

using namespace Std;

int main ()

{

cout<< ' A ' << ' << ' happy! ' <<endl;;

return 0;

}

Homework:

1: Try to define six variables, use all CPP five operators, and output. Be familiar with the arithmetic operators of CPP.

2: Output three single character (no matter, no short lattice)

3: Output three multi-character (no matter, short lattice)

Zerojudge:

General title: a001,a002,d827,d049,d126,d483

Study questions: d053,d461,d296,a042,a044

Rokua:

General title: p1001

Study questions: p1421

Basic input and output