View Compilation Error

0_0_37391815_21224.cpp: In function 'int main()':
0_0_37391815_21224.cpp:65:29: error: 'struct proton' has no member named 'l'
             p.low=p1.low+p2.l
                             ^
0_0_37391815_21224.cpp:65:29: error: expected '}' at end of input
0_0_37391815_21224.cpp:65:29: error: expected '}' at end of input
0_0_37391815_21224.cpp:65:29: error: expected '}' at end of input