/in/foo.c:1:1: error: unknown type name 'def'
 def gcd(a,b):
 ^~~
/in/foo.c: In function 'gcd':
/in/foo.c:1:13: error: expected declaration specifiers before ':' token
 def gcd(a,b):
             ^
/in/foo.c:1:5: warning: type of 'a' defaults to 'int' [-Wimplicit-int]
 def gcd(a,b):
     ^~~
/in/foo.c:1:5: warning: type of 'b' defaults to 'int' [-Wimplicit-int]
/in/foo.c:10:1: warning: control reaches end of non-void function [-Wreturn-type]
 print(ans,int(ans1))
 ^~~~~