Reading values from a file in C

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Reading values from a file in C

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#1 by (1 votes)

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I have a file containing the following values:

10 20 30
40 50 60

For each row, the values must be stored in a vector.

How do I get such values from the file, knowing that there is no exact quantity for each line?

c arquivo

asked by anonymous 11.08.2014 / 15:00

1 answer

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score 1 · Answer 1

I'll assume you can read each of the lines in your file, okay?

This code here takes each number from a line:

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

int main() {
    char linha[] = "10 100 1000";
    char *num;
    int x;
    num = strtok(linha, " \n\r");
    while (num != NULL) {
        sscanf(num, "%d", &x);
        printf("%d\n", x);
        num = strtok(NULL, " \n\r");
    }
    return 0;
}

What it does and tokenizar the line, that is, it extracts the elements of the string linha . These elements are the 'things' between spaces or the end of the line, so the numbers.