C 程式設計作業九，使用結構、結構陣列與檔案處理：解題

/* C Programming, Project 9 */

#include <stdio.h>
#include <stdlib.h>
#define MAX 20

struct record {
    char name[20];
    char sex;
    double score;
};

int queryDB(char [], struct record *);
void insertDB(struct record *);
void listAllName(void);
char *getLine(FILE *);

int main(void)
{
    struct record *stdPtr;
    char qname[20];
    char ch;
    int idx, ifFound;
    
    do {
        printf("Command(h for help):");
        ch = getche();
        switch (ch) {
            case 'h':
                printf("\nUse\n");
                printf("h to show this help;\n");
                printf("f to find a record by name;\n");
                printf("l to list all names in the file;\n");
                printf("i to insert a new record;\n");
                printf("d to delete a specified record;\n");
                printf("m to modify a specified record;\n");
                printf("q to quit.\n");
                break;
            case 'f':
                printf("\nFind the name:");
                gets(qname);
                ifFound = queryDB(qname, stdPtr);
                if (!ifFound) {
                    printf("\nName %s not found!\n", qname);
                } else {
                    printf("\nName: %s\n", stdPtr->name);
                    printf("Sex: %c\n", stdPtr->sex);
                    printf("Score: %f\n", stdPtr->score);
                }
                break;
            case 'l':
                listAllName();
                break;
            case 'i':
                break;
            case 'd':
                break;
            case 'm':
                break;
            case 0xd:
                break;
            case 'q':
                printf("\nQuit now.\n");
                break;
            default:
                printf("\nNot a valid command\n");
        }
        fflush(stdin);
        printf("\n");
    } while (ch!='q');

    system("pause");
    return 0;

}


int queryDB(char qname[], struct record *stdPtr) {
    struct record *studtemp;
    char *str, aname[20];
    char asex;
    double ascore;
    FILE *fptr;
    int i, rno, found=0;
    fptr = fopen("db.txt","r");
    if (fptr==NULL)
        return 0;
    else {
        fscanf(fptr, "%d\n", &rno);
        for (i=0;i<rno;i++) {
            str = getLine(fptr);
            strcpy(aname, str);
            str = getLine(fptr);
            asex = str[0];
            str = getLine(fptr);
            ascore = atof(str);
            if (!strcmp(aname,qname)) {
                strcpy(stdPtr->name, aname);
                stdPtr->sex = asex;
                stdPtr->score = ascore;
                found = 1;
            }
        }
        fclose(fptr);
        if (found)
            return 1;
        else
            return 0;
    }
}
void insertDB(struct record *stdPtr) {
}

void listAllName(void) {
    FILE *fptr;
    int i, rno=0;
    char *str;
    
    fptr = fopen("db.txt","r");
    if (fptr==NULL)
        printf("Failed to open file\n");
    else {
        fscanf(fptr, "%d\n", &rno);
        printf("\n");
        for (i=0;i<rno;i++) {
            str = getLine(fptr);
            puts(str);
            str = getLine(fptr);
            str = getLine(fptr);
        }
    }
    fclose(fptr);
}
char *getLine(FILE *fptr) {
    static char str[80];
    int i=0;
    
    while ((str[i]=getc(fptr)) != '\n')
        i++;
    str[i] = '\0';
    return str;
}

作業九題目
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