C++
Write a program that prompts the user for the observed boiling point of a substance in Centigrade and identifies the substance if the observed boiling point is within 5% of the expected boiling point. If the data input is more than 5% higher or lower than any of the boiling points in the table, the program should output the message - SUBSTANCE UNKNOWN.
Substance Normal boiling point (degrees Centigrade)
Water 100
Mercury 357
Copper 1187
Silver 2193
Gold 2660