How to name and create file in a loop

问题

In C, I want to create and open text files to write data into, but the problem is I want to name the files on the go, such as

FILE *ptr;

for(i=0;i<1000;i++){
   fopen_s(&ptr,"i.txt","w");
   operations to fill data into file i.txt;
   fclose(ptr);
}

such that I will create file 0.txt, 1.txt, 2.txt ... 999.txt.

How is this possible? I checked open and rename functions, but couldn't find a way to do.

Thank you so much for all your help. Best,

回答1:

use snprintf to set the file number:

FILE *ptr;
char name[FILENAME_MAX];

for(i=0;i<1000;i++){
   snprintf(name, sizeof(name), "%d.txt", i);
   fopen_s(&ptr, name, "w");
   //operations to fill data into file i.txt;
   fclose(ptr);
}

来源：https://stackoverflow.com/questions/13432535/how-to-name-and-create-file-in-a-loop