Question

该程序是N号学生的数据日志。它会计算谁拥有最高分，谁没有通过考试，谁有点年纪（他们至少失败了一次）。

下面有一些我无法识别的错误，作为结构的初学者。

我收到某些if语句和base [N]

的错误

编译器：默认编译器

E:\Desktop\4o set\ask5.c: In function `main':
E:\Desktop\4o set\ask5.c:35: error: invalid operands to binary ||
E:\Desktop\4o set\ask5.c:35: error: syntax error before "grade"

E:\Desktop\4o set\ask5.c:50: error: `base' undeclared (first use in this function)
E:\Desktop\4o set\ask5.c:50: error: (Each undeclared identifier is reported only once
E:\Desktop\4o set\ask5.c:50: error: for each function it appears in.)
E:\Desktop\4o set\ask5.c: At top level:
E:\Desktop\4o set\ask5.c:81: error: syntax error before "return"

Execution terminated

#include <stdio.h>

struct data{
    char fname[30];
    char lname[30];
    float grade;
    int trials;
    int year;
    int later_year;
};

main()
{
    int i,N,minyear,mostrials;
    float maxgrade;
    //struct data *base;    
    printf("Amount of students: ");
    scanf("%d",&N);
    //struct data *base=(struct data *)malloc(N*sizeof(struct data));
    {
    struct data base[N];
    for(i=0;i<N;i++){
        printf("\n-----------------------------");
        printf("\nStudent Data(remaining %d)\n",N-i);
        printf("-----------------------------\n\n");
        printf("\nName ");
        fgets(base[i].fname,30,stdin);
        printf("\nLast Name ");
        fgets(base[i].lname,30,stdin);
        Error:
        printf("\nGrade ");
        scanf(" %f",&(base[i].grade));
        if(base[i].grade<=0 || base[i]grade>=10){
            printf("\nGrade-> [0,10]\n");
            goto Error;
        }
        printf("\nNumber of attempts to pass ");
        scanf(" %d",&(base[i].trials));
        Error2:
        printf("\nYear ");
        scanf(" %d",&(base[i].year));
        if((base[i].year)<=0){
            printf("\nYear greater than 0");
                goto Error2;
        }
    }
    maxgrade=base[0].grade;
    minyear=base[0].year;
    mostrials=base[0].trials;
    for(i=0;i<N;i++){
        if(maxgrade<base[i].grade)
            maxgrade=base[i].grade;
        if(minyear>base[i].year)
            minyear=base[i].year;
        if(mostrials<base[i].trials)
            mostrials=base[i].trials;
    }
    printf("\n\n|Students with max grade (%f)|\n",maxgrade);
    for(i=0;i<N;i++)
        if(base[i].grade==maxgrade)
            printf("\n%s %s",base[i].fname,base[i].lname);
    printf("\n\n|Student who failed the most (%d fores)|\n",mostrials); 
    for(i=0;i<N;i++)
        if(base[i].trials==mostrials)
            printf("\n%s %s",base[i].fname,base[i].lname);
    printf("\n\n|Older students|\n");


    for(i=0;i<N;i++)
        if(base[i].year>=minyear)
           base[i].later_year=1;

    for(i=0;i<N;i++)
        if(base[i].later_year)
            printf("\n%s %s year(%d)",base[i].fname,base[i].lname,base[i].year);
    }
return 0;
}

Answer 1

main应返回int

int main()

你忘记了点。第35行sholud看起来像这样

if(base[i].grade<=0 || base[i].grade>=10

结构数据日志不能正常工作？

1 个答案: