Thread: Reading from an input file

  1. #1
    Registered User
    Join Date
    May 2010

    Reading from an input file

    It's been a while since I've had to do any programming at all so I'm back to basics again

    Basically I want to read a list of values from an input file into an array and print the values out again. My code looks like:

    #include <stdio.h>
    #include <math.h>
    FILE *infile1;
    int main()
    	float f0, A, t0, T, t[10], area, f[1800], g[1800], log[1800], tf=4679.45, ti=0.44;
    	int i;
    	infile1 = fopen("list.txt","r");
    	if(infile1 == NULL) {
    		printf("Could not read file!");
    	else {
    		for (i=0; i<10; i=i+1) {
    			printf("%f\n", t[i]);
    return 0;
    (ignore all the float except for t[10])

    The file list.txt simply contains a list of numbers 1 to 10 on separate lines (singly spaced), no other characters. At the moment I just want to get the program to print out these values in the same way but I can't remember how to even do this, how to use fgetc or even if this is the correct function to be using.
    The program clearly finds the file but returns a list of 10 random numbers

    Help on this much appreciated,

  2. #2
    Registered User NeonBlack's Avatar
    Join Date
    Nov 2007
    fgetc() gets a single character.

    You probably want to be using something like fscanf().

    But you definitely want to learn to read the documentation.
    cstdio (stdio.h) - C++ Reference
    I copied it from the last program in which I passed a parameter, which would have been pre-1989 I guess. - esbo

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