Under 16-bit environment the size of integer is of 2 bytes. As against this, under 32-bit environment an integer is of 4 bytes. Hence its range is -2147483648 to +2147483647. Thus there is no difference between an int and a long int. But what if we wish to store the age of a person in an integer? It would be improper to sacrifice a 4-byte integer when we know that the number to be stored in it is hardly going to exceed hundred. In such as case it would be more sensible to use a short int since it is only 2 bytes long.
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