I have a text file of 4 rows 3 columns ex:

1 2 5
3 5 6
8 8 2
1 1 0

I want to move from one file to the other file the third column so the new text will look like this

5
6
2
0

I've done this with fscanf so that every third time I use fscanf to insert it to the new file Is there a better way to access the third column other that scanning the first 2 numbers? Thanks

CodePudding user response：

*scanf is far more complex than you need for something this simple. When you can avoid scanf, you should. (You can almost always avoid it, where "almost" is just me hedging). This is a simple task, which should be done with simple tools. For example:

#include <ctype.h>
#include <stdio.h>

/* A simple implementation of `awk '{print $3}'` */

int
main(int argc, char* argv[])
{
    int c;
    int column = 0;
    int last = ' ';
    while( (c = getchar()) != EOF ){
        if( ! isspace(c) && isspace(last)){
            column  = 1;
        }
        if( c == '\n' ){
            column = 0;
            putchar(c);
        } else if( column == 3 ){
            putchar(c);
        }
        last = c;
    }
}

CodePudding user response：

Oh, I see. This worked for me.

#include <stdio.h>
#include <string.h>

int main() {
    char line[25];
    FILE * file;

    file = fopen("text1.txt", "r");

    fscanf(file, "%[^\n]s", &line);

    printf("%s", line   strlen(line) - 1);

    fclose(file);

    return 0;
}

Basically, you will store an entire line in an array of chars, then you will print certain pieces of that string (array of chars). With that in mind, you can make a way to do with multiple lines.

Hope this helped you out.