Dark Horse programmer------C language Learning notes---C language data types

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1.1 C Language data types

01 Integer Data

L Integer constant decimal number: starts with a non-0 digit. Octal: Starts with the number 0. Hex: Start with 0x or 0X

l integer variable int, long int, short int,

#include <stdio.h>intMain () {#definePI 3.14DoubleR; Doubleh; Doubles; //Prompt user to enter two number: radius r, High hprintf"Please enter a radius: Please enter High: \ n"); //accept data entered by the userscanf"%LF%LF",&r,&h); //Calculation Resultss =2*pi*r*h + pi*r*R; //Output Resultsprintf"the surface area of the cylinder is%f\n", s); return 0;}

02 Real-Data

l Real type constant decimal form: 0.12 0.55

Exponential form: 1.2e3 E is preceded by a number and the following exponent is an integer

* Real variable float, double, longdouble,

03-Character data

* Character constant: is a single character enclosed in single quotation marks. Like ' A ' ' 0 '

* Character variables: Character variables are used to store character constants.

* String constants: is a sequence of characters with a pair of double quotation marks, the escape character ' \ s ' as the end flag.

04 Enum Type: You can use an enumeration type when there are only a limited number of possible values for a variable.

05 pointer type: pointer type is a special type of data, stored values are interpreted as an address in memory

#include <stdio.h>intMain () {intI=0, j=0, x=Ten, y=Ten, z=Ten, t=Ten, B; floatf,f1,f2,f3; /*single-Mesh operation*/x= -x; Y= ++i; Y= j + +; printf ("x=%d,y=%d,z=%d\n", x, Y, z); printf ("i=%d,j=%d\n", i,j); /*Binocular Operation*/I= t%3; J= t/3; printf ("i=%d,j=%d\n", i,j); /*Type Conversions*/F=Ten; b=2; F1=1/b* -+Ten+F; F2=1.0/b* -+Ten+F; F3= (float)1/b* -+Ten+F; printf ("f1=%f,f2=%f,f3=%f\n", F1,F2,F3); 

Dark Horse programmer------C language Learning notes---C language data types