/in/foo.c:1:1: warning: data definition has no type or storage class
    1 | num1, num2 = map(float, input("请输入两个数字，用空格隔开：").split())
      | ^~~~
/in/foo.c:1:1: warning: type defaults to 'int' in declaration of 'num1' [-Wimplicit-int]
/in/foo.c:1:7: warning: type defaults to 'int' in declaration of 'num2' [-Wimplicit-int]
    1 | num1, num2 = map(float, input("请输入两个数字，用空格隔开：").split())
      |       ^~~~
/in/foo.c:1:14: warning: implicit declaration of function 'map' [-Wimplicit-function-declaration]
    1 | num1, num2 = map(float, input("请输入两个数字，用空格隔开：").split())
      |              ^~~
/in/foo.c:1:18: error: expected expression before 'float'
    1 | num1, num2 = map(float, input("请输入两个数字，用空格隔开：").split())
      |                  ^~~~~
/in/foo.c:2:1: error: expected ',' or ';' before 'op'
    2 | op = input("请输入运算符(+、-、*、/)：")
      | ^~