参考代码:
#include<iostream> #include<cstring> #include<iomanip> using namespace std; struct P { string name; int num; double price; }a[105]; int main() { //freopen("data.in.txt","r",stdin); //freopen("data.out.txt","w",stdout); int n; double sum=0; cin>>n; for(int i=0;i<n;i++) { cin>>a[i].name>>a[i].price>>a[i].num; sum+=a[i].num*a[i].price; } cout<<setiosflags(ios::fixed)<<setprecision(6)<<sum<<endl; return 0; }
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