C语言程序设计教程（第三版）课后习题11.5 （C语言代码）

解题思路:

注意事项:

参考代码:

#include<stdio.h>

#include<stdlib.h>

#define IDLEN 10

#define NAMELEN 10

typedef struct student {

char id[IDLEN];

char name[NAMELEN];

int grade[3];

}St;

int main()

{

int n, i, j;

St *record;

float mean[3], sum;

int max, sum2 , index = 0;

scanf("%d", &n);

record = malloc(n * sizeof(St));

for (i = 0; i < n; i++)

{

scanf("%s%s", record->id, record->name);

for (j = 0; j < 3; j++)

scanf("%d", &record->grade[j]);

record++;

}

for (i = 0; i < 3; i++)

{

record -= n;

sum = 0;

for (j = 0; j < n; j++, record++)

sum += record->grade[i];

mean[i] = sum / n;

}

record -= n;

for (i = 0; i < 3; i++)

printf("%.0f ", mean[i]);

putchar('\n');

for (i = 0; i < n; i++)

{

sum2 = 0;

for (j = 0; j < 3; j++)

sum2 += record[i].grade[j];

if (i == 0)

max = sum2;

if (max < sum2)

{

max = sum2;

index = i;

}

}

printf("%s %s ", record[index].id, record[index].name);

for (i = 0; i < 3; i++)

printf("%d ", record[index].grade[i]);

putchar('\n');

free(record);

return 0;

}