4 Attachment(s)
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.
Attachment 16130
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;
}
