This is the question of the textbook an introduction to programming with C++, 8th edition.
16. In this exercise, you will modify the tip program shown earlier in Figure 7-31. Follow the instructions for starting C++ and viewing the ModifyThis16.cpp file, which is con- tained in either the Cpp8\Chap07\ModifyThis16 Project folder or the Cpp8\Chap07 folder. (You may need to open the project/solution file first.) Change the for statement to a while statement. Save and then run the program. Test the program using 90.50 as the restaurant bill. The three tips should appear as shown earlier in Figure 7-32.