为什么这个 C 程序不会拾取转义的反斜杠？
我正在做 K&R 的练习 1-10
编写一个程序，将其输入复制到输出，用
\t替换每个制表符，用\b替换每个退格键，用\\< /代码>。这使得制表符和退格键以明确的方式可见。
我想出了这个......
#include <stdio.h>
int main () {
int c;
printf("\n"); // For readability
while ((c = getchar()) != EOF) {
switch (c) {
case '\t':
printf("\\t");
break;
case '\b':
printf("\\b");
case '\\':
printf("\\");
break;
default:
printf("%c", c);
break;
}
}
}
出于某种原因，它拒绝接触反斜杠。例如，当输入诸如 Hello how\ are you? 之类的字符串时，程序的输出是 Hello\thow\ are you? 这意味着它已将选项卡转换为 OK，但不是反斜杠。
我做错了什么吗？
I'm doing K&R's Exercise 1-10
Write a program to copy its input to its output, replacing each tab by
\t, each backspace by\band each backslash by\\. This makes tabs and backspaces visible in an unambiguous way.
I came up with this...
#include <stdio.h>
int main () {
int c;
printf("\n"); // For readability
while ((c = getchar()) != EOF) {
switch (c) {
case '\t':
printf("\\t");
break;
case '\b':
printf("\\b");
case '\\':
printf("\\");
break;
default:
printf("%c", c);
break;
}
}
}
For some reason, it refuses to touch backslashes. For example, the output from the program when fed a string such as Hello how\ are you? is Hello\thow\ are you? which means it converted the tab OK, but not the backslash.
Am I doing something wrong?
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评论（4）
您可能需要
printf("\\\\");，而不仅仅是printf("\\\\");。You probably want to
printf("\\\\");, instead of justprintf("\\");.您应该打印反斜杠及其转义符。
目前，您只是打印反斜杠 - 在这里您要转义第二个反斜杠，否则它会转义结束双引号：
You should be printing the backslash and its escape.
Currently you're just printing the backslash - here you're escaping the second backslash which would otherwise escape the closing double quote:
使用 printf("\\\\")
Use
printf("\\\\")当 C 编译器在源代码中找到
\\时，它会做什么？What does the C compiler do when it finds
\\in the source?