How is getchar used in the C programming language?

The function getchar() is used to read a character from the standard input stream (stdin) and return the ASCII value of that character. Its basic usage is as follows:

int getchar(void);

When using the getchar() function, it is common to assign the returned character value to an integer variable before performing any other operations. For example:

int c;
c = getchar();

// 判断输入的字符是否为换行符
if (c == '\n') {
    printf("输入的是换行符\n");
} else {
    printf("输入的字符是： %c\n", c);
}

The getchar() function will continuously wait for the user to input a character until the user presses the Enter key. By combining the getchar() function with a loop statement, it is possible to continuously read multiple characters.