r + mode

The r+ mode for opening a file is similar to the r mode but has some added features. It opens the file in both read and write mode.

However, the main purpose of r+ is reading. If the file exists, it will be opened for both reading and writing, but if the file does not exist, a new file will not be created.

Note - This mode has modification facility.

Example

#include<stdio.h>
#include<conio.h>
int main(){
   FILE *fp;
   fp = fopen("D://program.txt", "r+");
   if (fp == NULL) 
    {
       printf("Error");
       exit(1);   
    }
    fputs("C Programming",fp);
    printf("\n Modify data successfully");
    
 fclose(fp);
getch();
return 0;
}

Output