287342_0_7441.c
287342_0_7441.c(4) : error C2065: “unsinged” : 未声明的标识符
287342_0_7441.c(4) : error C2143: 语法错误 : 缺少“;”(在“类型”的前面)
287342_0_7441.c(5) : error C2065: “n” : 未声明的标识符
287342_0_7441.c(7) : error C2065: “sum” : 未声明的标识符
287342_0_7441.c(8) : error C2065: “i” : 未声明的标识符
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