foo.cc: In function 'int issushu(int)':
foo.cc:8:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
    8 |  for(i=2;i<=x-1;i++)
      |  ^~~
foo.cc:11:3: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   11 |   if(i==x)
      |   ^~
foo.cc:13:1: warning: control reaches end of non-void function [-Wreturn-type]
   13 | }
      | ^
foo.cc: In function 'int main()':
foo.cc:17:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   17 |  scanf("%d",&m);
      |  ~~~~~^~~~~~~~~

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