NetEase Cloud Classroom _c language programming first week: Data type: integer type, floating-point type, enum type

C Language Programming Advanced _ First week: Data type: integer type, floating-point type, enum type

1.0 Data Types

1.1 Integer type

1.2 Floating-point types

1.3 Logical Types

1.4 Type conversions and conditional operations

1.0 Data Types

1 integers

char (%c), short, int (%d), long (%ld), Long Long (C99)

2 floating point

Float (%f), double (%LF), long double (C99)

3 logic

BOOL (C99)

4 hands

5 Custom Types

The range of the number expressed: Char<short<int<float<double

sizeof is a static operator whose results are determined at compile time.

Do not operate in the parentheses of sizeof, these operations do not

1 #define_crt_secure_no_warnings2 3#include <stdio.h>4 5 Main ()6 {7     intA =6;8 9printf"sizeof (int) =%d\n",sizeof(int));Ten  Oneprintf"sizeof (a) =%d\n",sizeof(a++));//sizeof is a static operator whose results are determined at compile time. A     //Do not operate in the parentheses of sizeof, these operations do not -      -printf"a=%d\n", a);//is still 6 the  -printf"sizeof (a) =%d\n",sizeof(A +1.0));//8, change to double -  -printf"a=%d\n", a);//is still 6 +  -System"Pause"); +}

1.1 Integer type

Integer

Char:1 byte, 8 bit: -128~127

Short:2 bytes: -32768~32767

int: Depending on the compiler CPU, the usual meaning is 1 words

Long: Depending on the compiler CPU, the usual meaning is 1 words

Long Long:8 bytes

1 #define_crt_secure_no_warnings2 3#include <stdio.h>4 5 Main ()6 {7printf"sizeof (char) =%d\n",sizeof(Char));8 9printf"sizeof (short) =%d\n",sizeof( Short));Ten  Oneprintf"sizeof (int) =%d\n",sizeof(int)); A  -printf"sizeof (long) =%d\n",sizeof(Long)); -  theprintf"sizeof (Long long) =%d\n",sizeof(Long Long)); -  -System"Pause"); -}

sizeof (char) =1
sizeof (short) =2
sizeof (int) =4
sizeof (long) =4
sizeof (long Long) =8
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Range of integers

1 #define_crt_secure_no_warnings2 3#include <stdio.h>4#include <limits.h>5 6 Main ()7 {8     Charc =255;9     inti =255;Ten  Oneprintf"c=%d,i=%d\n", C, i);//char out of range, so display-1 A  -printf"%d,%d\n", Char_max, char_min);//127-128 -  theSystem"Pause"); -}

Complement

0000 0001 (1) +1111 1111 (-1) = (1) 0000 0000

1111 1111 is regarded as pure binary, is 255, is treated as a complement is-1

Similarly, for-A, whose complement is 0-a, is actually 2^n-a,n is this type of bit number

1.2 Floating-point types

1.3 Logical Types

1.4 Type conversions and conditional operations

NetEase Cloud Classroom _c language programming first week: Data type: integer type, floating-point type, enum type