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fscanf from txt file is reading the last record twice

1 New Member
after opening the text file the the prog is soposed to read each record into certain variables and then display the variable name to the screen

the problem i am geting is that the last record in the text file is being printed
twice

the txt file is formated as so
4 Jennifer f n
3 Alexandra f n


while (!feof(fp))
{
fscanf(fp, "%d %s %c %c" , &age, &name, &sex, &sn);
printf("the data in name is %s\n",name)
}
Jun 24 '08 #1
3 6410
oler1s
671 Recognized Expert Contributor
Two hints. I want to see if you can figure this out for yourself.

1) feof does not do what you think it does. Or put another way. How would you know you have reached the end of something?

2) Are you familiar with return values? Functions can return something. What could returning a value be useful for? Do the C library functions return values?
Jun 24 '08 #2
Visame
7 New Member
Expand|Select|Wrap|Line Numbers
  1. while (!feof(fp))
  2. {
  3. fscanf(fp, "%d %s %c %c" , &age, &name, &sex, &sn);
  4. printf("the data in name is %s\n",name)
  5. }
I believe the problem lies in function FEOF.
You can try this:
Expand|Select|Wrap|Line Numbers
  1. if (fscanf(fp, "%d %s %c %c" , &age, &name, &sex, &sn)==4)
  2. printf("the data in name is %s\n",name);
  3.  
or
Expand|Select|Wrap|Line Numbers
  1. while (fscanf(fp, "%d %s %c %c" , &age, &name, &sex, &sn)==4)
  2. {
  3. printf("the data in name is %s\n",name)
  4. }
  5.  
Jul 6 '08 #3
moonavar
1 New Member
hello here is our solution
change coding of fprintf use %wd format that is use width for each variable
fprintf(fp, "%3d %15s %1c %1c" , &age, &name, &sex, &sn);
and also make same change in fscanf also
while (fscanf(fp, "%3d %15s %1c %1c" , &age, &name, &sex, &sn))
{
printf("the data in name is %s\n",name)
}
and you will get your desire output.
so now Cheersssssssss. .........
Nov 24 '12 #4

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