Append mode is used to append or add data to the existing data of file, if any. Hence, when you open a file in Append (a) mode, the cursor is positioned at the end of the present data in the file.

What is the use of append in C?

Append function allows appending some string of characters to an existing string. There are different syntax present for this in C++. 1. It is used to append a given string str1 to another specified string str.

How do you append strings in C?

In C, the strcat() function is used to concatenate two strings. It concatenates one string (the source) to the end of another string (the destination). The pointer of the source string is appended to the end of the destination string, thus concatenating both strings.