To add user input to the "Hello World" program, you can use the `scanf` function from the `stdio.h` library. Here's an updated version of the program:

```
#include <stdio.h>

int main()
{
    char name[100];
    printf("Enter your name: ");
    scanf("%s", name);
    printf("Hello %s\n", name);
    return 0;
}```

To run this updated program, follow the same steps as outlined above for compiling and running the original program. When you run the program, you'll be prompted to enter your name, and the program will then print "Hello" followed by your name.
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