View Compilation Error

847470_0_0_6579.c
847470_0_0_6579.c(4) : error C2065: “unsign” : 未声明的标识符
847470_0_0_6579.c(4) : error C2143: 语法错误 : 缺少“;”(在“类型”的前面)
847470_0_0_6579.c(5) : error C2065: “i” : 未声明的标识符
847470_0_0_6579.c(6) : error C2065: “sum” : 未声明的标识符
847470_0_0_6579.c(7) : error C2065: “n” : 未声明的标识符
847470_0_0_6579.c(9) : error C2143: 语法错误 : 缺少“;”(在“!=”的前面)