View Compilation Error

0_0_11799276_11681.cpp:1: error: `let' does not name a type
0_0_11799276_11681.cpp:2: error: expected unqualified-id before "do"
0_0_11799276_11681.cpp:2: error: expected `,' or `;' before "do"
0_0_11799276_11681.cpp:3: error: expected unqualified-id before '+' token
0_0_11799276_11681.cpp:3: error: expected `,' or `;' before '+' token
0_0_11799276_11681.cpp:7: error: `then' does not name a type