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【单选题】
设变量n已正确定义并赋值,以下不能实现自然数1到n累加求和的程序段是______。A.
int sum=1, i=0;while(i<=n){i++; sum+=i;}
B.
int sum=0,i=1;while(i<=n){ sum+=i;i++;}
C.
int sum=0, i=0;while(i<=n){i++; sum+=i;}
D.
int sum=1, i=1;while(i<=n){i++; sum+=i;}
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