But generally, only pointers pointing to the same array will compare sizes with each other, or add and subtract, otherwise it is meaningless.
Same array:
P 1==p2 points to the same position.
p 1 & gt； P2 p 1 is in the high address position.
int a[ 10]，* p = a； P points to a[0], p+ 1 points to a[ 1], ...
This is what you put on it. P
int argc，char *argv[]
Char *argv[] refers to an array whose size is int argc and the number of elements in the group.
As for what you said about entering proc ..., one * * four, the argc value is 4 strlen () is to calculate the length of characters, starting with the second element argv 1, and finally n is 7.
The last one doesn't know
There is one last one.