#include <stdio.h>

struct gstudent {
    int id;
    double report;
    double exam;
};

void descriminate3(struct gstudent *p) {
    if (p->id % 3 ==0) {
        p->report *= 1.4; 
    }
}

int main(void) {
    int i; 
    struct gstudent data[] = {
	{  1, 19.0, 64.5 }, 
	{  2, 21.0, 68.0 }, 
	{  3, 18.0, 42.5 }, 
	{  4, 15.5, 37.5 }, 
	{  5, 17.0, 62.5 }, 
	{  6, 18.5, 65.0 }, 
	{  7, 16.5, 42.5 }, 
	{  8,  6.5, 21.5 }, 
	{  9, 20.0, 67.5 }, 
	{ 10, 12.0, 29.0 }, 
	{ 11, 14.5, 38.5 }, 
	{ 12, 17.5, 58.0 }, 
	{ -1,    0,    0 } 
    };

    for (i=0; data[i].id >= 0; i++) {
        descriminate3(&data[i]);
    }

    for (i=0; data[i].id >= 0; i++) {
        printf("学籍番号: %03d、レポート: %6.2f 点、テスト: %6.2f 点、計: %6.2f 点\n",
	       data[i].id, data[i].report, data[i].exam, data[i].report + data[i].exam);
    }

    return 0;
}