Different file opening modes in C

• File opening mode specifies the purpose for which programmer wants to open the file.
• C provides three basic purposes; read, write and append.
• And the basic modes area “r” for reading, “w” for writing, and “a” for appending data.
• All basic and mixed modes are tabulated below:
Mode Purpose
r Read in text mode
w Write in text mode
a Append in text mode
r+ Read + write in text mode
w+ Write + read in text mode
a+ Append + read in text mode
rb Reade in binary mode
wb Write in binary mode
ab Append in binary mode
rb+ Read + write in binary mode
wb+ Write + read in binary mode
ab+ Append + read in binary mode
• The file opening mode to be used depends upon requirement and “whether the file already exists?”
• Some important situations are given below.
Mode File already exist File does not exist
r Read -
w Overwrite Create
a Append Create

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More Useful Topics...

 

History Of C..

In the beginning was Charles Babbage and his Analytical Engine, a machine
he built in 1822 that could be programmed to carry out different computations.
Move forward more than 100 years, where the U.S. government in
1942 used concepts from Babbage’s engine to create the ENIAC, the first
modern computer.
Meanwhile, over at the AT&T Bell Labs, in 1972 Dennis Ritchie was working
with two languages: B (for Bell) and BCPL (Basic Combined Programming
Language). Inspired by Pascal, Mr. Ritchie developed the C programming
language.

My 1st Program...


#include
#include
void main ()
{
clrscr ();
printf ("\n\n\n\n");
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printf ("\t\t\t********************************\n");
printf ("\t\t\t\"Life is Good...\"\n");
printf ("\t\t\t********************************");
getch ();
}

Next Step...


#include
#include

void main ()
{
clrscr ();
printf ("\n\n\n\n\n\n\n\n");
printf ("\t\t\t --------------------------- \n\n");

printf ("\t\t\t | IGCT, Info Computers, INDIA | \n\n");
printf ("\t\t\t --------------------------- ");

getch ();

}

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