无法找到任何有效的shell。在外部终端中执行所必需的

so I'm currently running my C program in NetBeans IDE 8.1, but as soon as I tried using the scanf function, I began running into issues. I have MinGW download and have added C:\MinGW\bin; to my path environment variable. I looked up and found that I should be running external terminal to use scanf but I am receiving this error. Does anyone have any idea how to fix this. I'm pretty new to C and this IDE so simpler instructions would be appreciated. Here is the code:so I'm currently running my C program in NetBea