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warning: unknown escape sequence: '\!' [enabled by default]
  printf("\\ this is a back-slash character\!\n");
         ^
w1p2.c:25:9: warning: unknown escape sequence: '\!' [enabled by default]
  printf("%% this is a percent sign character\!\n");
         ^
w1p2.c:26:9: warning: unknown escape sequence: '\!' [enabled by default]
  printf("\" this is a double - quote character\!\n");

我做了一个简单的printf程序，我不断收到这些消息。
到底是怎么回事，我该怎么解决？
在此之前，我尝试使用\符号，但效果不佳。