View Compilation Error

0_0_26278324_31964.cpp: In function 'int main()':
0_0_26278324_31964.cpp:8:32: error: invalid conversion from 'int' to 'const char*' [-fpermissive]
 while(scanf('%lf%d%lf',&d,&r,&t),r)
                                ^
In file included from 0_0_26278324_31964.cpp:1:0:
GCC4.9.2/x86_64-w64-mingw32/include/stdio.h:386:15: note: initializing argument 1 of 'int scanf(const char*, ...)'
   int __cdecl scanf(const char * __restrict__ _Format,...) __MINGW_ATTRIB_DEPRECATED_SEC_WARN;
               ^
0_0_26278324_31964.cpp:13:39: error: invalid conversion from 'int' to 'const char*' [-fpermissive]
 printf('Trip #%d: %.2lf %.2lf',i,s1,s2);
                                       ^
In file included from 0_0_26278324_31964.cpp:1:0:
GCC4.9.2/x86_64-w64-mingw32/include/stdio.h:378:15: note: initializing argument 1 of 'int printf(const char*, ...)'
   int __cdecl printf(const char * __restrict__ _Format,...);
               ^