Need help with program

Question

My program is not swapping the birthdates of people from an input file. The input file is like so:
20010628 John Doe
19760912 David Pea
https://code.sololearn.com/cd2S6Ftbl0CI/?ref=app

Answer 1

make these changes:
int s=0, first=0, date=0, origDate=0, longDate=0, name=0;

for(;i<s;i++)

Answer 2

Still didnt work

Answer 3

maybe sololearn compiler doesnt support file.

Answer 4

Thanks for trying