You can do: # use nullglob in case there are no matching files shopt -s nullglob # create an array with all the filer/dir inside ~/myDir arr=(~/myDir/*) # iterate through array using a counter for ((i=0; i<${#arr[@]}; i++)); do #do something to each element of array echo “${arr[$i]}” done You can also do this for … Read more
The slow CPU wasting part is the “do serial sending”. The while loop with just a short sleep will use negligible CPU. Can you show the serial sending code. There may be a way to speed that up. On this rather slow CPU I see this: import time while True: time.sleep(0.2) # 0% CPU while … Read more
For most purposes, you probably won’t notice a difference. However, foreach reads each line into a list (not an array) before going through it line by line, whereas while reads one line at a time. As foreach will use more memory and require processing time upfront, it is generally recommended to use while to iterate … Read more
Since x and y have been declared as volatile, the programmer expects that they will be changed from outside the program. In that case, your code will remain in the loop while(x>y); and will return the value x-y after the values are changed from outside such that x <= y. The exact reason why this … Read more
No, changing the type of loop wouldn’t matter. The only thing that can make it faster would be to have less nesting of loops, and looping over less values. The only difference between a for loop and a while loop is the syntax for defining them. There is no performance difference at all. int i … Read more
The design of this depends on what you want doing for 15s. The two most plausible cases are “do this every X for 15s” or “wait for X to happen or 15s whichever comes sooner”, which will lead to very different code. Just waiting Thread.sleep(15000) This doesn’t iterate, but if you want to do nothing … Read more
For-loops: For-loop in C: for(int x = 0; x<=3; x++) { //Do something! } The same loop in 8086 assembler: xor cx,cx ; cx-register is the counter, set to 0 loop1 nop ; Whatever you wanna do goes here, should not change cx inc cx ; Increment cmp cx,3 ; Compare cx to the limit … Read more
They are equivalent, even if you turn the optimizer off. Example: #include <stdio.h> extern void f(void) { while(1) { putchar(‘ ‘); } } extern void g(void) { for(;;){ putchar(‘ ‘); } } extern void h(void) { z: putchar(‘ ‘); goto z; } Compile with gcc -O0 gives equivalent assembly for all 3 functions: f: ; … Read more
To do this, you would need to increment a counter on each iteration (like you are trying to avoid). count=0 while read -r line; do printf ‘%d %s\n’ “$count” “${line*//}” (( count++ )) done < test.txt EDIT: After some more thought, you can do it without a counter if you have bash version 4 or … Read more
A couple of changes mean that only an R or r will roll. Any other character will quit import random while True: print(‘Your score so far is {}.’.format(myScore)) print(“Would you like to roll or quit?”) ans = input(“Roll…”) if ans.lower() == ‘r’: R = np.random.randint(1, 8) print(“You rolled a {}.”.format(R)) myScore = R + myScore … Read more