conditional-statements

问题 I want to add a volume to my service, but only if the final user gave a folder for it. Otherwise, no volume should be mounted, for the already-prepared image has valid data in a default folder. That is, I want to do something like (pseudocode): services: my_awesome_service: volumes: if ${VARIABLE} => ${VARIABLE}:/app/folder Are such conditional statements definable in a docker-compose file? The only way I see to make this possible is to first define a base docker-compose file, which does not

问题 I am learning c. I have a question. Why doesn't my program work? #include<stdio.h> #include<conio.h> #include<stdlib.h> char cmd; void exec() { if (cmd == "e") { printf("%c", cmd); // exit(0); } else { printf("Illegal Arg"); } } void input() { scanf("%c", &cmd); exec(); } int main() { input(); return 0; } I insert a "e" but it says illegal arg. cmd is not equal to "e". Why? I set cmd with scanf to "e". 回答1: First of, in C single quotes are char literals, and double quotes are string literals.

来源： https://stackoverflow.com/questions/45083000/pandas-groupby-with-conditional-formula

来源： https://stackoverflow.com/questions/45083000/pandas-groupby-with-conditional-formula

来源： https://stackoverflow.com/questions/63314219/calculate-the-total-paid-from-a-foreach-generated-table-in-codeigniter

来源： https://stackoverflow.com/questions/63314219/calculate-the-total-paid-from-a-foreach-generated-table-in-codeigniter

来源： https://stackoverflow.com/questions/33948574/inequalities-and-parenthesis-in-python

来源： https://stackoverflow.com/questions/48886505/clips-use-string-to-make-a-compare-condition

来源： https://stackoverflow.com/questions/48886505/clips-use-string-to-make-a-compare-condition

来源： https://stackoverflow.com/questions/64180034/matlab-how-to-divide-up-a-string-according-to-a-recurring-number