找找错误在哪？
#include<stdio.h>
#include<stdlib.h>
#define num 1
#define res 30
typedef struct employee
{
    int age;
    char name[10];
    double salary;
}PEMP;
//输入函数
void update(PEMP company[])
{
    int i;
    PEMP emp;
    if((PEMP *)malloc(num*sizeof(PEMP))==NULL)
        exit(0);
    printf("共有%d位员工请输入信息：\n",num);
    for(i=0;i<num;i++)
    {
        scanf("%d,%s,%lf",&emp.age,emp.name,&emp.salary);
        company[i]=emp;
    }
    printf("%d位员工信息为：\n",num);
    for(i=0;i<num;i++)
    {
        printf("%d,%s,%f\n",company[i].age,company[i].name,company[i].salary);
    }
   
}
//对年龄大于age的工资求和
double total(PEMP company[],int age)
{
    double sum=0.0;
    int i;
    for(i=0;i<num;i++)
        if(company[i].age>=age)
            sum+=(company[i].salary);
        return(sum);
}
//对年龄大于age的工资求平均值
double mean(PEMP company[],int age)
{
    int i;
    double average=0.0;
    for(i=0;i<num;i++)
        if(company[i].age>=age)
        {
            average+=(company[i].salary);
        }
        return(average/(++i));
        
}
void main()
{
    PEMP company[num]={0};
    update(company);
    printf("total=%g\n",total(company,res));
    printf("mean=%g\n",mean(company,res));
}