Question

I have a file with data like this

{0 /Data1/ , 0x00, 0, 0xFF},

{1 /data2/ , 0x00, 0, 0xFF},

{2 /data3/ , 0x00, 0, 0xFF},

{3 /data4/ , 0x00, 0, 0xFF},
…

I want to print only the second and last column of each line. Below is the code I worked on. Its printing the whole line. How to edit to print only the second and last column of each line.

#include<stdio.h>

#include<conio.h>

int main ()
{       
    char filename[] = "file.txt"; 

    FILE *file = fopen(filename, "r");

    if(file!= NULL)     
    {                           
        char line[128];                 

        while ( fgets( line, sizeof line, file)!= NULL)
        {                                           
            fputs ( line,stdout);                           
        }                                                       
        fclose(file);                           
    }                                               
    else                    
    {                               
        perror(filename);                   
    }                                           


    getch();                    

    return 0;                       
}        

Please Help!

Thanks a ton!

Answer 1

sscanf() should do the trick.

It uses a format string just like printf(), then reads the values into variables.

#include <stdio.h>
#include <stdlib.h>

int main()
{
    unsigned int a, c, d, e;
    char b[101] = "";
    char filename[] = "file.txt";
    FILE *file = fopen(filename, "r");
    if (file != NULL) {
        char line[128];
        while (fgets(line, sizeof line, file) != NULL) {
            sscanf(line, "{%d %100s , %x, %d, %x}", &a, b, &c, &d, &e);
            printf("%d %X\n", d, e);
        }
        fclose(file);
    } else {
        perror(filename);
    }
    return 0;
}