CODEWITHSUNDEEP
cfgetsfreadscanf
Liquidmetal
Liquidmetal

Reputation: 295

Reading a file in C with input with different data types

I am reading a file in C that is formatted like this

int int int int char double double

but repeated a known number of times. (The first line of the file, not listed in the sample, specifies the number of times this sequence will repeat) I want to parse these values into a structure. However, I am not sure how to read these elements as they have different datatypes, I was looking at three different methods

fread --> does not work because the different elements are of different data types and wont have the same number of bytes.

fscanf --> does not work because of multiple different data types

fgets--> does not work becase it only stops once there is a newline character.

So I am not sure what to do about this. Maybe I am looking to hard for an elegant solution to loading a file with ugly input like this, or maybe I am overlooking something in one of the functions that I have already mentioned.

This is for a school project btw, but I am not asking for an answer, just a hint.

I am limited to what I can use in the stdio and the stdlib libraries.

thanks for all the help

Upvotes: 0

Views: 4967

Answers (3)

R Sahu
R Sahu

Reputation: 206627

To elaborate on the earlier answers, you would need something like:

int intVar1;
int intVar2;
int intVar3;
int intVar4;
char c;
double doubleVar1;
double doubleVar2;

fscanf(file, "%d %d %d %d %c %lf %lf", 
       &intVar1,
       &intVar2,
       &intVar3,
       &intVar4,
       &c,
       &doubleVar1,
       &doubleVar2);

Upvotes: 1

LearningC
LearningC

Reputation: 3162

you can use any of those functions to read from the file. the easiest to use for this case is fscanf()
you can read inside a loop since you know the number of times to read by just iterating known number of times.

fscanf(fd,"%d %d %d %d %d %c %lf %lf",&a,&b,&c,&d,&e,%f,&h)

or you can create a structure

struct data
{
  int a;
  int b;
  int c;
  int d;
  char e;
  double h;
  double i;
}var1;

and use it in fscanf() to fill the value for its members

Upvotes: 1

Jesus Ramos
Jesus Ramos

Reputation: 23268

fscanf should work.

fscanf(file, "%d %d %d %d %c %lf %lf", ....);

Upvotes: 1

Related Questions