How to use scanf and printf in c++

The scanf and printf functions in C are used to read data from standard input and write data to standard output. scanf usage: int scanf(format, ...), where format is the data format to be read, ... is the variable address to be read; printf usage: int printf(format, ...), where format is The data format to be written,... is the variable to be written.

Usage of scanf and printf in C

scanf and printf are two commonly used standard input/output functions in C. They are used to read data from standard input and write data to standard output respectively.

scanf

Usage:

<code class="cpp">int scanf(const char *format, ...);</code>

Among them:

• format: Specifies the format string of the data to be read.
• ...: The address of the variable to be read.

Format specifier:

• ##%d: Integer
• %f : Floating point
• %c: Character
• %s: String

Example:

<code class="cpp">int age;
char name[50];
scanf("%d %s", &age, name);</code>

printf

Usage:

<code class="cpp">int printf(const char *format, ...);</code>

• format: Specifies the format string of the data to be written.
• ...: Variable to be written.

Format specifier:

##%d
• : Integer
%f
• : Floating point
%c
• : Character
%s
• : String

<code class="cpp">int age = 25;
printf("姓名：%s，年龄：%d\n", name, age);</code>

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