解题思路:
注意事项:
参考代码:
#include<stdio.h>
struct prut
{
char MC[101];
double DJ;
int ML;
};
int main()
{
int n,i;
double sum = 0.0;
struct prut x[100];
scanf("%d", &n);
for (i = 0; i < n; i++)
scanf("%s %lf %d", x[i].MC, &x[i].DJ, &x[i].ML);
for (i = 0; i < n; i++)
{
sum += (double)x[i].ML * x[i].DJ;
}
printf("%.6lf", sum);
return 0;
}
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