Reading from file and printing double data

Hi!

I am new to C and try to make a program that reads a segment of data from a file and prints it to the screen. When I declare the array that stores the data read from file as float, it works well. But when I declare it as double, the program prints out only zeros. Can anyone explain why? Am I doing something wrong?

I need to store this data with double precision because of computations that will be done with them later. How can I fix it?

Here is the code:

Code:

---


# include <stdio.h>

int main (void)
{
        FILE *fpIn = fopen( "S001.txt", "r");        // Open input file

        const int nsize = 2048;               
               
        double y[200000];

        if (fpIn != NULL) // Successful opening of input file
        {
       
                // Reads from input file first segment of nsize samples into y:       
                unsigned int i;                       
                int numRead = 0;
                for (i = 0; i < nsize; i++ )
                {
                        numRead = fscanf(fpIn, "%f", &y[i]);

                        printf("%f\n",y[i]);

                }

                close(fpIn);                        // Close input file
        }

        return 0;
}

---

Thank you in advance!

Elena

do not put two hundred thousand doubles on the stack, please

change %f to %lf

Thank you Tux0r! I followed your advice and tried an array of size 1 and %lf, but it still prints out 0.000000. It is very strange.

Code:

---

#include <stdio.h>

int main() {
        FILE *f=fopen("file.txt","r");

        if(f==NULL)
                return 1;

        double values[10];
        unsigned int i;                       

        for(i = 0; i < 10; ++i) {
                fscanf(f, "%lf",&values[i]);
                printf("%lf\n",values[i]);
    }

        close(f);

        return 0;
}

---

file.txt

Code:

---

0.37
13.37
13.37
13.37
11.37
12.37
19.37
13.37
13.37
13.37

---

works here

Hurray! It worked!!! I just didn't put %lf on fscanf(), only on printf(), and when I did, it started to work! Thank you a lot, Tux0r!!!