View Compilation Error

0_0_37840049_22010.cpp:8:9: error: 'shuchu' does not name a type
 typedef shuchu double;
         ^
0_0_37840049_22010.cpp: In function 'void doit()':
0_0_37840049_22010.cpp:154:48: error: 'shuchu' was not declared in this scope
   printf ("%.1f\n", shuchu(d[0]+d[1]*t+d[2]*t*t));
                                                ^