Question: This is code for To find sum of two numbers without using any operator,here why they are used %c instead of %d ? What is the features of %c compare to %d ? 

```
int add(int x, int y)
{
    return printf("%*c%*c",  x, ' ',  y, ' ');
}

int main()
{
    printf("Sum = %d", add(3, 4));
    return 0;
}

```

Answer: 
The table in the data sheet seems quite clear: Y0 is active if A0, A1, A2, and A3 are low and A4, A5, A6, and A7 are high. Y1 is active under all the same conditions except A0 is high.
[![Thanks for the comments to help me connect the dots in figuring out how the address is map to the input address](https://i.stack.imgur.com/v84lK.jpg)](https://i.stack.imgur.com/v84lK.jpg)

Thanks for the comments to help me connect the dots in figuring out how the address is map to the input address