/in/foo.c:1:1: warning: data definition has no type or storage class
 aa=intin (input())
 ^~
/in/foo.c:1:1: warning: type defaults to 'int' in declaration of 'aa' [-Wimplicit-int]
/in/foo.c:1:4: warning: implicit declaration of function 'intin' [-Wimplicit-function-declaration]
 aa=intin (input())
    ^~~~~
/in/foo.c:1:11: warning: implicit declaration of function 'input' [-Wimplicit-function-declaration]
 aa=intin (input())
           ^~~~~
/in/foo.c:1:4: error: initializer element is not constant
 aa=intin (input())
    ^~~~~
/in/foo.c:2:1: error: expected ',' or ';' before 'flag'
 flag=Ture
 ^~~~