Sunday 11 August 2019

c - Program Reading Last Line of File Twice




I am writing a program that reads a .txt file line by line. I have been able to do this so far, but the last line of the file is read twice. I can't seem to figure out why. Thank you for your help in advance! Here is the code I have:



#include 
#include

#define MAX_LINELENGTH 200


int main(int argc, char* argv[])
{
FILE* textFile;
char buffer[MAX_LINELENGTH];
char strName[40];
int numCharsTot;
int numWordsInMesg;
int numCharsInMesg;

textFile = fopen(argv[1], "r");

if(textFile == NULL)
{
printf("Error while opening the file.\n");
return 0;
}
while(!feof(textFile))
{
fgets(buffer, MAX_LINELENGTH, textFile); //Gets a line from file
//printf("Got Line: %s\n", buffer);
}

}

Answer



while(!feof(textFile))


is wrong, you end up "eating" the end of file. You should do



while(fgets(buffer, MAX_LINELENGTH, textFile))
{

// process the line
}


Related: Why is iostream::eof inside a loop condition considered wrong?


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