//仅供参考
#include <stdio.h>
int main(){
double ans = 0.0;
int n = 1;
/*
//----start----
while (n <= 20){
ans += ((double)n+1.0/(double)n);
n += 1;
}
//----end----
**/
//----start----
do {
ans += (double)n+1.0/(double)n;
n+=1;
}while (n <= 20);
//----end----
printf ("sum=%f\n", ans);
return 0;
}
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