"what was the first computer program you ever wrote? in what language?"

I wrote a numerical "magic" trick in 73 and I wrote it in IBM-BASIC and it was stored on punch tape.

"write down a three digit number"
"reverse the order of the numbers"
"subtract the smaller value from the bigger value"
"Tell me the last digit the answer and I'll tell you what the full answer is."

#CoSoProgramming

cc @anatman