foo.c: In function 'jinwei':
foo.c:44:16: warning: returning 'long long int *' from a function with return type 'long long int' makes integer from pointer without a cast [-Wint-conversion]
   44 |         return tiao;//返回进制数
      |                ^~~~
foo.c: In function 'xuanshupd':
foo.c:73:16: warning: returning 'long long int *' from a function with return type 'long long int' makes integer from pointer without a cast [-Wint-conversion]
   73 |         return a;
      |                ^
foo.c:51:23: warning: unused variable 'b' [-Wunused-variable]
   51 |         long long int b[k];//b:标尺；c:测量
      |                       ^
foo.c:49:25: warning: unused variable 'j' [-Wunused-variable]
   49 |         long long int i,j,pd=1;
      |                         ^

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