View Compilation Error

0_0_22104885_15752.cpp: In function 'void convo(int*, int*, int*, int)':
0_0_22104885_15752.cpp:163:1: error: 't' was not declared in this scope
 t[i]=((x[i]+!x[j])*(!y[j]-y[i])+(!x[j]-x[i])*(y[i]+!y[j]))*(cp){0,0.25};
 ^
0_0_22104885_15752.cpp:165:9: error: 't' was not declared in this scope
     fft(t, len, -1);
         ^