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C program to change the file name using rename() function
The rename function changes a file or directory from oldname to newname. This operation is just like a move operation. Hence, we can also use this rename function to move a file.
This function is present in stdio.h library header files.
The syntax of rename function is as follows −
int rename(const char * oldname, const char * newname);
Function of rename()
It accepts two parameters. One is oldname and another is newname.
These two parameters are pointer to constant character, which define old and new name of file.
If file renamed is successful, then it returns zero otherwise, it returns a non-zero integer.
During the rename operation if that newname file is already present, then it replaces that already existing file with this new file.
Algorithm
Refer an algorithm given below for changing the file name by using rename() function.
Step 1 − Declare variables
Step 2 − Enter old file path
Step 3 − Enter new file path
Step 4 − check rename(old, new) == 0
If yes print file renamed successfully Else Unable to rename.
Program
Following is the C program to change the file name by using rename() function −
#include <stdio.h>
int main(){
char old[100], new[100];
printf("Enter old file path: ");
scanf("%s", old);
printf("Enter new file path: ");
scanf("%s", new);
if (rename(old, new) == 0){
printf("File renamed successfully.
");
}
else{
printf("Unable to rename files
");
}
return 0;
}Output
When the above program is executed, it produces the following result −
Run 1: Enter old file path: test.exe Enter new file path: test1.exe File renamed successfully. Run 2: Enter old file path: priya.c Enter new file path: bhanu.c Unable to rename files
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