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Try system("pause") but it may not work in your system.
Parallel array in this case just means keep using the age[] array... But it somehow disappeared in your 2nd example. Then when you do the...

In this version you forgot about the parallel array 'age' altogether.
Where to put system(pause)? Just before the return in main().

Prototype is the function header without its body. Used to define the types of arguments and return type. strncmp() is a standard library function. You should not put in the prototype for those...