Write records into file : c

Question

int main()
{

    FILE *fp;
    char another = 'Y';
    struct emp
    {
            char name[20];
            int age;
            float bs;
    };
    struct emp e;

    fp = fopen("employee.dat", "w");

    if(fp == NULL)
    {
            printf("file cannot be opened for writing\n");
            exit(1);
    }

    while(another == 'Y')
    {
            printf("\n enter name, age and basic salary: ");
            scanf("%s %d %f", e.name, &e.age, &e.bs);
            fprintf(fp, "%s %d %f\n", e.name, e.age, e.bs);

            printf(" Add another record (Y/N)");
            fflush(stdin);
            scanf("%c", &another);
    }

    fclose(fp);
    return 0;

In this program I am trying to write records into file named, employee.dat. Program executed fine, but it will takes only one record of employee and then program gets terminated. It is not asking for next record to add i.e.,

 fflush(stdin); 
 scanf("%c", &another);

are not getting executed in the program.

Thanks in advance....

score 2 · Answer 1 · answered Aug 04 '13 at 13:38

2

The problem that you're experiencing is that scanf("%c", &another); only grabs a single character from the input buffer. This would be fine, except that there's still a newline left in the input buffer that resulted from hitting 'enter' after your input. You need to clear the input buffer after you use getchar() like this:

char c;
while ((c = getchar()) != '\n');

answered Aug 04 '13 at 13:38

No Idea For Name

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No need!! noly use flushall(); after scanf – One Man Crew Aug 04 '13 at 14:00
@OneManCrew what do you mean "no need"? it's another way to do it, just as good as yours. – No Idea For Name Aug 04 '13 at 14:05

One Man Crew · Answer 2 · 2013-08-04T14:12:24.863

0

You can do this:

while(another == 'Y' || another == 'y')
    {
            printf("\n enter name, age and basic salary: ");
            scanf("%s %d %f", e.name, &e.age, &e.bs);
            fprintf(fp, "%s %d %f\n", e.name, e.age, e.bs);

            printf(" Add another record (Y/N)");

            another=getch();
            //scanf("%c", &another);

    }

edited Aug 04 '13 at 14:12

answered Aug 04 '13 at 14:00

One Man Crew

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`flushall` is not a standard function. And in any case, trying to flush an input stream is undefined behavior. – interjay Aug 04 '13 at 14:09

Lidong Guo · Answer 3 · 2013-08-04T14:51:21.297

0

You can fixed it simply by use : scanf("\n%c",&another); instead of scanf("%c",&another);

scanf("%s %d %f", e.name, &e.age, &e.bs);

Example--->Here your input is : name_1 22 6000.000 <"Enter">

Then in the buffer : name_1 -->e.name 22-->e.age 6000.00-->e.bs <"Enter">-->nothing

fflush(stdin);//it didn't delete the <"Enter">.
scanf("\n%c", &another);//here we deal with <"Enter">

edited Aug 04 '13 at 14:51

answered Aug 04 '13 at 14:44

Lidong Guo

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Write records into file : c

3 Answers3