View Compilation Error

0_0_30836820_15203.cpp: In function 'DO solve(int, int)':
0_0_30836820_15203.cpp:39:22: error: invalid operands of types 'DO {aka long double}' and 'int' to binary 'operator%'
    DO y1=calc(y[i-1]%2
                      ^
0_0_30836820_15203.cpp:39:22: error: expected ',' or ';' at end of input
0_0_30836820_15203.cpp:39:22: error: expected '}' at end of input
0_0_30836820_15203.cpp:39:22: error: expected '}' at end of input
0_0_30836820_15203.cpp:39:22: error: expected '}' at end of input