开发代码来评估函数调用，类型铸造和代码流算法。

代码说明：

Develop code to evaluate function calls, type casting and code flow algorithms for performance. Programming assignment 4 is exploring the use of Shared Memory (shm). // // This program configures the shm region, accepts user input, and stores // the user msg in shm. // // Scope: // Open and attach to shm region // while runable // shm allowed to write // clear message // prompt user for msg // store msg in shm // if msg begins with "end", detach from shm // allow program 2 to resume // exit // -Develop code to evaluate function calls, type casting and code flow algorithms for performance. Programming assignment 4 is exploring the use of Shared Memory (shm). // // This program configures the shm region, accepts user input, and stores // the user msg in shm. // // Scope: // Open and attach to shm region // while runable // shm allowed to write // clear message // prompt user for msg // store msg in