Computer programming in the punched card era

Long, long ago, before we had keyboards like today, people told computers what to do using special cards. These cards were like giant pieces of paper with tiny holes punched in them. Each hole or no hole was like a letter in a secret code that the computer could understand. It was a very clever way to give instructions to these amazing machines!

For many years, from when computers were first invented until the 1970s, these punched cards were the main way to write computer programs. Think of it like writing a story, but instead of words on paper, you were making holes on cards. Programmers would carefully punch out the holes, one by one, to create their instructions. It took a lot of patience and precision!

These punched cards were super important because they were the first way to 'talk' to computers and tell them what jobs to do. Without them, computers couldn't do amazing things like add numbers really fast or help scientists discover new things. They were the key to unlocking the power of early computers and making them useful for many tasks.

Computers had special parts that could read these punched cards. Imagine a machine that shines a light through the holes. If there was a hole, the light would pass through, and the computer would know it was a 'yes' or a '1'. If there was no hole, the light wouldn't pass, and the computer would know it was a 'no' or a '0'. This way, the computer read all the instructions and knew what to do!