C问：没有警告？ [英] C question: no warning?

问题描述

main()
{
  printf("Hello World.");
}

$ b <返回类型为'int'

Why does no warning is produced in gcc compiler even though we declare main() with return type 'int'

推荐答案

因为你不使用-Wall标志。当你这样做，你应该得到：

Because you're not using the -Wall flag. When you do, you should get:

foo.c:1: warning: return type defaults to ‘int’
foo.c: In function ‘main’:
foo.c:1: warning: implicit declaration of function ‘printf’
foo.c:1: warning: incompatible implicit declaration of built-in function ‘printf’
foo.c:1: warning: control reaches end of non-void function

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