Data and Simple Computing Program (2)

Section II data, types, and simple programs

First, common basic types

1, integer int long int (long)

(2 bytes) (8 bytes)

2, float float single-precision type

Double Dual Precision Type

3, character type (ASCII code) char

(integer type)

Example: int long double float

35L 2.5 2.5f

Scientific counting Method:

Example: 3+108 (2e8 (integer)) (scientific notation belongs to floating-point type)

int:

120 binary

O12 octal

ox12 Hex

Second, function printf and simple text output program

Format: printf (String)

"Formal parameters (formal parameter)"

printf ("Hello")

"Actual parameter (argument)"

Significance:

Sends a string to the display hardware.

PLACEHOLDER:

1,%d integer placeholders

2,%ld Long integer placeholders

3,%f decimal digit double-precision placeholder

4,%LF decimal digit long double precision placeholder

5,%e scientific counting method placeholder

6,%g computer according to choose%e or%f

7,%c character placeholder

8.%s String placeholder

Data and Simple Computing Program (2)