Issue
What i read from a file: a P1/ s/ e/ t etc. / for different line. After specific letters(like 'a') come some data i have to collect so i don't want to use fgets. It doesn't end running. Could you help me, please?
char com[21];
fscanf(src,"%s",com);
while(com!=EOF)
{
if(com[0]=='a')
fprintf(dest,"%s 1",com);
if(com[0]=='s')
fprintf(dest,"%s 2",com);
fscanf(src,"%s",com);
}
Solution
Simple way is to test if fscanf()
succeeded as the loop condition and you don't need a fscanf()
before the loop:
char com[21];
while(fscanf(src,"%20s",com) == 1)
{
if(com[0]=='a')
fprintf(dest,"%s 1",com);
if(com[0]=='s')
fprintf(dest,"%s 2",com);
}
fscanf()
returns the number of items successfully scanned. So, you don't need to check if it' returned EOF
.
Note that I changed the format string to avoid buffer overflow. I suggest you use fgets()
instead of fscanf()
(and remember to take care of newline chars if it matters).
Answered By - P.P Answer Checked By - Marilyn (PHPFixing Volunteer)
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