c语言代码解决问题

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;

}