Study report from Pascal to C + + two days

1. Calls to libraries

#include <cstdio>//printf and SCANFD calls (formatted input output), GetChar () call (pause)

#include <cstdlib>//system () call (pause)

#include <iostream>//cin,cout calls (stream input and output)

#include <cstring>//and character related

(currently only see these, remember quite a lot of library)

2. Input and output

1) cin,cout

No special request ... (I think so now)

#include <cstring>#include<iostream>#include<cstdlib>#include<cstdio>using namespacestd;intMain () {CharA; Freopen ("zf.in","R", stdin); Freopen ("Zf.out","W", stdout); CIN>>A; cout<<"  "<<a<<Endl; cout<<" "<<a<<a<<a<<Endl; cout<<a<<a<<a<<a<<a<<Endl; Fclose (stdin);    Fclose (stdout); return 0;}

2) printf,scanf

1)%d integer decimal

2)%o integral type 8 binary

3)%x integral type 16 binary

4)%f real type (float)

5)%LF Real type (double)

Ps:\n for line break

#include <cstdio>using namespacestd;intMain () {Const DoublePi=3.1415926; Doubler,h,s1,s2,s; scanf ("%LF%LF",&r,&h); S1=pi*r*0; S2=2*pi*r*h; S=2*s1+S2; printf ("%0.3lf\n", s); return 0;} 

3) file input/output

Freopen ("1.in","R", stdin); Freopen ("1.out","w", stdout); // called // Close

Just change "1.in" and "1.out".

3. Simple Assignment

Commonly used are:

+,-,*,/,%,++,--(arithmetic operator)

>,<,==,>=,<=,!= (relational operator)

(Logical and bitwise operations are not very well understood.) ）

4. Data type

Integer: Int (length: Long)

Real type: double,float

Boolean type: BOOL

Focus!!!

Must be played: using namespace std;

Study report from Pascal to C + + two days