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What are the usages of get function in C language?

Sep 20, 2023 pm 01:38 PM
c languageget function

c语言get函数用法有从键盘读取用户的输入和从文件中读取内容。详细介绍:1、从键盘读取用户的输入,程序会提示用户输入一个字符,并使用get函数读取用户的输入,然后,程序会将读取到的字符打印出来;2、从文件中读取内容,程序会提示用户输入一行字符串,并使用get函数逐个字符地读取用户的输入,直到遇到换行符为止。然后,程序会将读取到的字符串打印出来。

What are the usages of get function in C language?

C语言中的get函数是一个用于从标准输入流中获取字符的函数。它可以用于从键盘读取用户的输入,并将输入的字符存储到内存中的变量中。在本文中,我们将介绍get函数的用法以及一些常见的应用场景。

首先,让我们来看一下get函数的基本用法。get函数的原型如下:

int get(void);

get函数没有任何参数,它返回一个整数值,表示读取到的字符的ASCII码。如果读取失败或者到达文件末尾,get函数将返回EOF(End of File)。

下面是一个简单的示例,演示了get函数的基本用法:

#include
int main() {
int c;
printf("请输入一个字符:");
c = get();
printf("您输入的字符是:%c\n", c);
return 0;
}

在上面的示例中,程序会提示用户输入一个字符,并使用get函数读取用户的输入。然后,程序会将读取到的字符打印出来。需要注意的是,get函数只能读取一个字符,如果用户输入多个字符,get函数只会读取第一个字符。

除了基本的用法外,get函数还可以与循环结合使用,用于读取一行字符串。下面是一个示例,演示了如何使用get函数读取一行字符串:

#include
#define MAX_SIZE 100
int main() {
char str[MAX_SIZE];
printf("请输入一行字符串:");
int i = 0;
while ((str[i] = get()) != '\n') {
i++;
}
str[i] = '\0';
printf("您输入的字符串是:%s\n", str);
return 0;
}

在上面的示例中,程序会提示用户输入一行字符串,并使用get函数逐个字符地读取用户的输入,直到遇到换行符为止。然后,程序会将读取到的字符串打印出来。

除了从标准输入流中读取字符外,get函数还可以从文件中读取字符。下面是一个示例,演示了如何使用get函数从文件中读取字符:

#include
int main() {
FILE *file;
char c;
file = fopen("example.txt", "r");
if (file == NULL) {
printf("无法打开文件\n");
return 1;
}
while ((c = getc(file)) != EOF) {
printf("%c", c);
}
fclose(file);
return 0;
}

在上面的示例中,程序会打开名为example.txt的文件,并使用get函数逐个字符地读取文件中的内容,直到到达文件末尾为止。然后,程序会将读取到的字符打印出来。

综上所述,get函数是一个非常有用的函数,可以用于从标准输入流或文件中读取字符。它的用法简单明了,可以满足各种不同的需求。无论是从键盘读取用户的输入,还是从文件中读取内容,get函数都能够提供便捷的解决方案。

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