View Compilation Error

0_0_13197232_20488.cpp: In function 'void out()':
0_0_13197232_20488.cpp:54:14: error: invalid conversion from 'char' to 'const char*' [-fpermissive]
    printf('0');
              ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/cstdio:42:0,
                 from 0_0_13197232_20488.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/stdio.h:296:5: note: initializing argument 1 of 'int printf(const char*, ...)'
 int printf (const char *__format, ...)
     ^