Include stdio.h
in your header files.
In your main function, include the following lines on top.
freopen("input.in","r",stdin);
freopen("output.out","w",stdout);
In most online programming competitions, input is given through stdin
and output through stdout
. However, in this case, you have to read input from a file (.in) and write to a file (.out). freopen takes the stream(stdin, stdout) specified as the third argument to re-open the stream and instead use the file specified.
Edit: Sample code takes input from input.in and writes to output.out.
#include <stdio.h>
int main(){
freopen("input.in","r",stdin);
freopen("output.out","w",stdout);
int n;
scanf("%d",&n);
printf("%d\n",n);
return 0;
}