View Compilation Error

0_0_29636092_25851.cpp
0_0_29636092_25851.cpp(50) : error C2065: “sum”: 未声明的标识符
0_0_29636092_25851.cpp(53) : error C2059: 语法错误:“return”
0_0_29636092_25851.cpp(54) : error C2059: 语法错误:“}”
0_0_29636092_25851.cpp(54) : error C2143: 语法错误 : 缺少“;”(在“}”的前面)