/in/foo.c:1:1: warning: data definition has no type or storage class
 a=intin (input())
 ^
/in/foo.c:1:1: warning: type defaults to 'int' in declaration of 'a' [-Wimplicit-int]
/in/foo.c:1:3: warning: implicit declaration of function 'intin' [-Wimplicit-function-declaration]
 a=intin (input())
   ^~~~~
/in/foo.c:1:10: warning: implicit declaration of function 'input' [-Wimplicit-function-declaration]
 a=intin (input())
          ^~~~~
/in/foo.c:1:3: error: initializer element is not constant
 a=intin (input())
   ^~~~~
/in/foo.c:2:1: error: expected ',' or ';' before 'flag'
 flag=Ture
 ^~~~