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我晕了,找了好多遍不知道哪错,帮看看,谢谢用的C++,但是cout<<setpresicion(2)<<sumn<<endl;不好使。 现在这个样子帮我看看哪不行啊? #include <iostream> using namespace std; int main() { double sumn = 0 , month; int i = 1; while (i <= 12) { cin >> month; sumn = sumn + month; ++i; } sumn = sumn / i + 0.05; printf("$%.2f\n" , sumn); return 0; } Followed by:
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