foo.c:1:1: warning: data definition has no type or storage class
 a=int(input('a:'))
 ^
foo.c:1:1: warning: type defaults to 'int' in declaration of 'a' [-Wimplicit-int]
foo.c:1:3: error: expected expression before 'int'
 a=int(input('a:'))
   ^~~
foo.c:1:13: warning: multi-character character constant [-Wmultichar]
 a=int(input('a:'))
             ^~~~
foo.c:2:13: warning: multi-character character constant [-Wmultichar]
 b=int(input('b:'))
             ^~~~
foo.c:3:13: warning: multi-character character constant [-Wmultichar]
 c=int(input('c:'))
             ^~~~

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