How does cortex-M33, for example, know previous exception priority?

Hello I want to know about exception priority. In following situation A has highest priority, described as priority A. B has medium priority, described as priority B. C has lowest priority...
How does cortex-M33, for example, know previous exception priority?

Hello I want to know about exception priority. In following situation A has highest priority, described as priority A. B has medium priority, described as priority B. C has lowest priority...
Warning:no previous prototype for function 'delay'

Why am I getting this warning ?? #include "stm32f0xx.h" // Device header void delay() { for (int i=0;i<100000;i++); } int main() { RCC->AHBENR |= RCC_AHBENR_GPIOAEN; GPIOA->MODER |= GPIO_MODER_MODER5_0;...
Warning:no previous prototype for function 'delay'

Why am I getting this warning ?? #include "stm32f0xx.h" // Device header void delay() { for (int i=0;i<100000;i++); } int main() { RCC->AHBENR |= RCC_AHBENR_GPIOAEN; GPIOA->MODER |= GPIO_MODER_MODER5_0;...
Back down from uVision5 to previous version.

I have uninstalled uVision5, but I still get the link error for using an evaluation copy. How can I completely remove uVision5 and return to my previous working copy.