Write a program using the pthreads api that prints "hello, world! " from four threads it creates and prints the ids of the threads along with in the format "hello, world! from thread id : 0" from each of the threads. you can use a global variable to declare the number of threads to be created and set that to 4 for this assignment.

Consider the usual algorithm to convert an infix expression to a postfix expression. suppose that you have read 10 input characters during a conversion and that the stack now contains these symbols: (5 points) | | | + | | ( | bottom |_*_| now, suppose that you read and process the 11th symbol of the input. draw the stack for the case where the 11th symbol is