Can't read file from txt.

[roverzon]

I have a code for reading a series of data from a text file.
The code was shown below
I don't know why I can't successfully read file. (Can open successfully)

btw: the text file and source code were located at the same directory.

#include <stdio.h>
#include <stdlib.h>
 
int main(){
    int numOfAtoms;
    int num;
    float time;
    float internalEnergy;
 
    FILE *cfPtr;
 
    if((cfPtr= fopen("DEA_27_CoordSample.txt","r"))== NULL){
        printf("The File might not be opened \n");
        }
    else{
        printf("The File is successfully opened \n");
        fscanf(cfPtr,"%d",&numOfAtoms);
        fscanf(cfPtr,"i =    %d, time =     %f, E =     %f",&num);
        }
    printf("number of atoms is: %d \n",numOfAtoms);
    printf("i = %d\n",num);
    system("pause");
    return 0;
}

[weaknessforcats]

Part of your problem is here:

      fscanf(cfPtr,"i =    %d, time =     %f, E =     %f",&num);

The "i =" and the "time =" and the "E =" are in your data file and your fscanf is trying to read them. When it fails it sets a fail flag. Ths fail flag is the first thing fscanf checks and once it's set all the fscanf's in your program stop working.

You would have detected this if you had checked the return from fscanf on every call to be sure thre call worked successfully.

You have to read each and every byte of your data file.