Thread: File I/O

How can I read several data from a file, which includes one data for each line, and some comments follow those data?
Fox example:
"input.txt"

12.3 ;first data use for ....
34.5 ;second data use for...
90.67 ;3rd data use for...
12098 ;4th data use for...
¡¡¡¡

Like so

Code:

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

int main ( ) {
    FILE *fp = fopen( "input.txt", "r" );
    char buff[BUFSIZ];
    while ( fgets(buff,BUFSIZ,fp) != NULL ) {
        float var;
        char *comment = strchr( buff, ';' );
        if ( comment != NULL ) *comment = '\0'; // blow away the comment
        if ( sscanf( buff, "%f", &var ) == 1 ) {
            printf( "Data=%f\n", var );
        } else {
            printf( "Garbage in %s", buff );
        }
    }
    return 0;
}