Example
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Emoticons
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#1 Sapperm ?
Reputation: 2
- Posts: 10
- Joined: 31-October 12
Posted Yesterday, 04:42 PM
I am trying to read in data from a file and the data file contains lines(22,32,34)
(56,22,34)
and so on in that format.
I can read in the lines if they were just
22 32 24
so on...
Just fine, but the additional chars are throwing me off.
A made a simple driver program to try and debug my problem and all I can get is for it to read the first line and no others. If I set the while loop to run for infinity it will pick up other lines besides the first. If I set it to just read in the 7 elements that it should it reads in nothing, and finally if I set it like it is now below it only picks up the first line.
Any help or tips appreciated.
int main(int argc, char *argv[]) { FILE *fp; int a,b,c,total; char x,y,z,j; fp = fopen(argv[1],"r"); // while( total = fscanf(fp,"%d%d%d",&a,&b,&c) > 0 ){ while( total = fscanf(fp,"%c%d%c%d%c%d%c",&x,&a,&y,&b,&z,&c,&j) >= 0 ){ printf("total = %d \n",total); printf("First = %d Second = %d Third = %d\n",a,b,c); printf("First = %c Second = %c Third = %c 4th = %c\n",x,y,z,j); } return 0; }
Is This A Good Question/Topic? 0
Replies To: Reading in data from a file
#2 Skydiver ? 
Reputation: 1750
- Posts: 5,198
- Joined: 05-May 12
Re: Reading in data from a file
Posted Yesterday, 04:50 PM
You also need to read the '\n' or '\r\n' that is at the end of each line after the ')'.I suggest using fgets() to get the entire line first, and then using sscanf() or strtok() to parse the line.
#3 Sapperm ?
Reputation: 2
- Posts: 10
- Joined: 31-October 12
Re: Reading in data from a file
Posted Yesterday, 04:58 PM
Thanks for that I'll get to work on that right away. Is there a reason for when the data is say three ints
such as 78 67 62 you can read it in with scanf("&d&d&d",&a,&b,&c); and not worry about the \n?
#4 Sapperm ?
Reputation: 2
- Posts: 10
- Joined: 31-October 12
Re: Reading in data from a file
Posted Yesterday, 06:57 PM
Very messy and I'm sure a very long way around, but this is how I got it to work....also ignore any // slashed out code. That was left over from trying a lot of stuff.
Press ENTER or type command to continue #include "tree23.c" #include <string.h> int main(int argc, char *argv[]) { FILE *fp; int a,b,c,total; char string[100]; char x,y,z,j,k; char *point; fp = fopen(argv[1],"r"); char delim1[] = "("; char delim2[] = ")"; char delim3[] = ","; // while( total = fscanf(fp,"%d%d%d",&a,&b,&c) > 0 ){ // printf("here\n"); while(fgets(string,100,fp)!= NULL ){ // sscanf(string,"%d%d%d",&a,&b,&c); // a =(int) string[0]; // b =(int) string[3]; // c =(int) string[6]; point = strtok(string,delim2); point = strtok(point,delim1); // point = strtok(point,delim3); sscanf(point,"%d%c%d%c%d",&a,&x,&b,&y,&c); // printf("total = %d \n",total); printf("First = %d Second = %d Third = %d\n",a,b,c); // printf("First = %c Second = %c Third = %c 4th = %c\n",x,y,z,j); } return 0; } ~
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Source: http://www.dreamincode.net/forums/topic/318016-reading-in-data-from-a-file/
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