The meaning of \ and % in c language

In C language, \ and % have special meanings. Among them: \ is an escape character, which is used to change the meaning of the characters that follow, such as escaping new lines, tabs, double quotes, and reverse characters. slash. % is a format specifier, used to instruct functions such as printf() and scanf() how to format input or output values. Common specifiers include %d (integer), %f (floating point number), %s (character String), %c (character), %% (output percent sign).

In C language, \ and %

In C language, \ and % is an escape character and format specifier with special meaning.

\: The escape character

\ is an escape character that changes the character that follows it The meaning, common usage is as follows:

• Escape new line: \n
• Escape tab character: \t
• Escape double quotes: \"
• Escape backslash: \\

%: Format specifier

#% is the format specifier that instructs functions such as printf() and scanf() how to format input or The output value. Common format specifiers are:

• ##%d: integer
##%f
• : floating point number
%s
• : String
%c
• : Character
%%
• : Output percentage symbol %

Usage example:

<code class="c">printf("我的年龄是 %d 岁。\n", age); // 输出年龄
scanf("%d", &age); // 输入年龄

printf("我的姓名是 %s，成绩是 %f。\n", name, score); // 输出姓名和成绩
scanf("%s %f", &name, &score); // 输入姓名和成绩</code>

Note:

escape characters must follow before the escaped character, otherwise it will be treated as a normal character. The

• format specifier must match the corresponding data type, otherwise undefined behavior will occur.

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