C/stdio.h/fopen

fopen: opens a file by *fname

<source lang="cpp">

//Header: #include <stdio.h> //Declaration: FILE *fopen(const char *fname, const char *mode); //Return: returns a FILE pointer on success or NULL pointer on failure

//The legal values for mode.

//Mode Meaning //"r": Open text file for reading //"w": Create a text file for writing //"a": Append to text file //"rb": Open binary file for reading //"wb": Create binary file for writing //"ab": Append to a binary file //"r+": Open text file for read/write //"w+": Create text file for read/write //"a+": Open text file for read/write //"rb+" or "r+b": Open binary file for read/write //"wb+" or "w+b": Create binary file for read/write //"ab+" or "a+b": Open binary file for read/write

 #include <stdio.h>
 #include <stdlib.h>
 int main(int argc, char *argv[])
 {
     FILE *fp;
  
     if ((fp = fopen("test", "w"))==NULL) {
       printf("Cannot open file.\n");
       exit(1);
     }
     fclose(fp);
 }
          
      </source>

Open a file called TEST for binary read/write operations

<source lang="cpp">

 #include <stdio.h>
 #include <stdlib.h>
 int main(int argc, char *argv[])
 {
     FILE *fp;
  
     if((fp=fopen("test", "rb+"))==NULL) {
       printf("Cannot open file.\n");
       exit(1);
     }
    
     fclose(fp);
 }
  
          
      </source>