Thread: trying to read numbers from a file - only getting zeros

Hi! I'm a little rusty on C but I have been working on a program that needs to read from two files and compare values/do math. I'm trying to make a struct for each file, skipping the first few lines because they contain strings. However, whenever I try to do this I only get zeros in the struct. I'm not sure why this keeps happening. I think it might be something with malloc and the pointers. Thanks for your help.

also I will attach an example of the file I'm reading.

Code:

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

typedef struct fcat_s{
    float x;
    float y;
    float a_j2000;
    float b_j2000;
    float mag;
} fcat_s;

typedef struct cat_s{
    float num;
    float x;
    float y;
    float xworld;
    float yworld;
    float flux_auto;
    float mag_auto;
    float awin;
    float bwin;
} cat_s;

void readFCAT(FILE *fcat, fcat_s *f, int fcatcount){
    int i;
    for (i=0;i<(fcatcount);i++){
        if (i>5){
            fscanf(fcat, "%f", &f[i-5].x);
            fscanf(fcat, "%f", &f[i-5].y);
            fscanf(fcat, "%f", &f[i-5].a_j2000);
            fscanf(fcat, "%f", &f[i-5].b_j2000);
            fscanf(fcat, "%f", &f[i-5].mag);
        }
    }
}

void readCAT(FILE *cat, cat_s *c, int catcount){
    int j;
    for (j=0;j<(catcount);j++){
        if (j>9){
            fscanf(cat, "%f", &c[j-9].num);
            fscanf(cat, "%f", &c[j-9].x);
            fscanf(cat, "%f", &c[j-9].y);
            fscanf(cat, "%f", &c[j-9].xworld);
            fscanf(cat, "%f", &c[j-9].yworld);
            fscanf(cat, "%f", &c[j-9].flux_auto);
            fscanf(cat, "%f", &c[j-9].mag_auto);
            fscanf(cat, "%f", &c[j-9].awin);
            fscanf(cat, "%f", &c[j-9].bwin);
        }
    }
}

void printFCAT(fcat_s *f, int fcatcount){
    int i=0;
    for(i=0;(i<(fcatcount-5));i++){
        printf("%lf\t %lf\t %lf\t %lf\t %lf\n", f[i].x, f[i].y, f[i].a_j2000, f[i].b_j2000, f[i].mag);
    }
}

void printCAT(cat_s *c, int catcount){
    int i=0;
    for(i=0;(i<(catcount-9));i++){
        printf("%lf\t %lf\t %lf\t %lf\t %lf\t %lf\t %lf\t %lf\t %lf\n", c[i].num, c[i].x, c[i].y, c[i].xworld, c[i].yworld, c[i].flux_auto, c[i].mag_auto, c[i].awin, c[i].bwin);
    }
}

int main(void) {

    float exptime = 0;
    float F = 0;
    float Mi = 0;
    float Mcat = 0;
    float FLUX_AUTO = 0;
    float ZP = 0;
    char fcatname[50];
    char catname[50];
    int fcatcount = 0;
    int catcount = 0;
    char fcat_c;
    char cat_c;
    fcat_s *f;
    cat_s *c;

    printf("Please input the .fcat file name:\n");
    scanf("%str", fcatname);
    
    printf("Please input the .cat file name:\n");
    scanf("%str", catname);

    printf("Please input the exposure time:\n");
    scanf("%f", &exptime);
    
    FILE* fcat;
    fcat = fopen(fcatname, "r");

    if (fcat == NULL) {
        printf("The input file does not exist\n");
    }
    else {
        for (fcat_c = getc(fcat); fcat_c != EOF; fcat_c = getc(fcat)){
                if (fcat_c == '\n')
                    fcatcount++;
        }
    }
    
    FILE* cat;
       cat = fopen(catname, "r");
    
    if (cat == NULL) {
        printf("The input file does not exist\n");
    }
    else {
        for (cat_c = getc(cat); cat_c != EOF; cat_c = getc(cat)) {
                if (cat_c == '\n')
                    catcount++;
          //  printf("%c", cat_c);
        }
    }
    
    printf("\n");
    printf("The .fcat file has %d lines. \n", fcatcount);
    printf("The .cat file has %d lines. \n", catcount);
    
    printf("\n\n");
    
    f = (fcat_s*)malloc(fcatcount*sizeof(fcat_s));
    c = (cat_s*)malloc(catcount*sizeof(cat_s));
    
    rewind(fcat);
    rewind(cat);
    
    readFCAT(fcat, f, fcatcount);
    readCAT(cat, c, catcount);
    
    printf("FCAT CONTENTS\n");
    printFCAT(f, fcatcount);
    
    printf("\n\n");
    
    printf("CAT CONTENTS\n");
    printCAT(c, catcount);
    
    fclose(fcat);
    fclose(cat);
    

    return 0;
}