Which path format to use in C on Windows, "D:\\source.txt" or "D:/source.txt"? -

i knew can't use d:\demo.txt \d considered escape character , hence have use d:\\demo.txt.but minutes ago found out d:/demo.txt works fine don't have worry escape characters /. using codeblocks on windows, , want know 1 of these formats path valid c on platform.here's code , commented-out lines work fine.

#include<stdio.h>  int main() { char ch; file *fp,*tp; fp=fopen("d:\\source.txt","r"); //fp=fopen("d:/source.txt","r"); tp=fopen("d:\\encrypt.txt","w"); //tp=fopen("d:/encrypt.txt","w"); if(fp==null||tp==null) printf("error"); while((ch=getc(fp))!=eof) putc(~ch,tp); fclose(fp); fclose(tp); } 

windows (like ms-dos before it) requires back-slashes path separator command line tools built into/provided windows.

internal functions, however, have accepted forward or backward slashes interchangeably. personally, prefer forward slashes general rule, it's personal preference -- either works fine.