>>157
(3_5)
#include <stdio.h>
struct grade_t {char *name; int logi; int math; int ecom;};
struct grade_t array[4] = {
{"A", 90, 80, 90},{"B", 70, 85, 85},{"C", 90, 70, 80},{"D", 80, 80, 90}
};
int sum(struct grade_t *x)
{
return x->logi + x->math + x->ecom;
}
void ave(int num, struct grade_t x[])
{
int i; double logi=0.0, math=0.0, ecom=0.0;
for (i = 0; i < num; i++) {
logi += x[i].logi; math += x[i].math; ecom += x[i].ecom;
}
printf("average logi:%g, math:%g, ecom:%g\n",logi/num, math/num, ecom/num);
}
int main()
{
int i;
for (i = 0; i < 4; i++) {
printf("%s sum:%d\n", array[i].name, sum(&array[i]));
}
ave(4, array);
return 0;
}