Typedef

This is useful if you want to use an inbuilt data type repeatedly, but want to give it a shorter identifier—similar to aliasing.

#include <iostream.h>
 
typedef unsigned short int USHORT;
 
int main(){
 USHORT x = 5;
 USHORT Area = x * x;
 cout << "x = " << x << "\n";
 cout << "Area = " << x*x << "\n";
 return 0;
}

Suppose you need a hundred or so unsigned short integers….instead of typing the keywords unsigned short int each time, just use USHORT.

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