#include <stdio.h>

struct project
{
      int prnum;
      char prname[15];
      int prgrade;
    };
    struct std{
    int num;
    char name[15];
    struct project math;
    struct project english;
    struct project c;
    struct project maogai;
    struct project PE;
    }student[10];
double aver(int num)
{
    int i;
    for(i=0;i<10;i++)
    {
    if(num==student[i].num ) break;
    }
double a=(double)(student[i].englishgrade+student[i].maogaigrade+student[i].mathgrade+student[i].PEgrade+student[i].cgrade)/5;
return (a);
}
int main( )
{

    int num;
    scanf("%d",&num);
     printf("学号为%d五门平均成绩为%3.1f",num,aver(num));
    return 0;
}






这是错误类型
error C2143: syntax error : missing ';' before 'type'
error C2065: 'a' : undeclared identifier