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I have a problem in doing program in language C for the...

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Question by umney
Submitted on 1/11/2004
Related FAQ: comp.lang.c Answers to Frequently Asked Questions (FAQ List)
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I have a problem in doing program in language C for the topic File Processing. The problem is that, if I want to write something in my output file, by refering to my input file, what should I write down in my program? Say, I wanna count the total marks by refering to the marks in my input file,then, I wanna print out the total marks in my output file, so, what should I do? Please give me the answer and if possible, please give me the sample of program and the files for both input and output...TQ


Answer by harish
Submitted on 3/26/2004
Rating:  Rate this answer: Vote
hi

this can be done by opening both the files at a time.open ur input file for reading as u are not going to modify it and open ur output file for writting.


# include <stdio.h>

int main (void)
{
int ch;
FILE *input, output;

input = fopen ("input file name","r");
if (input == NULL)
{
fprintf (stderr, "Error in opening the file\n");
exit (1);
}
output = fopen ("output file name","w");
if (output == NULL)
{
fprintf (stderr, "error");
exit (1);
}

while ((ch = fgetc (input)) != EOF)
{
make ur calculations heree

for writting it to output file
  fputc (output)

 

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