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cgi and perl cgi and perl All the integer constants in the program like 5 and 9 have become 5.0 and 9.0 and so on. If a constant number includes a decimal point, then the compiler assumes it's a double precision floating point number. If it doesn't then the compiler assumes it's an integer.

cgi and perl However when two numbers of different types such as integer and floating point are involved in a calculation on the right hand side of an equation, the compiler promotes the number of the weaker type to the stronger type before doing the calculation. What makes one type of number stronger than another? It's the ability to represent a broader spectrum of numbers. Since a byte can only represent 256 numbers it's weaker than a short which can stand for 65,535 different numbers including all the numbers a byte can represent. Similarly an int is stronger than a short. Floating point numbers are stronger than any integer type and doubles are the strongest type of all.

cgi and perl Therefore we could have left all the small constants as integers and the program output would have been unchanged. However it is customary to put in decimal points to remind yourself and anyone else who may be unlucky enough to have to read your code, exactly what is going on.This applies to calculations that take place on the right hand side of an equal sign. The left hand side of the equals sign is a different story. In fact it's so different that programmers have given the different sides of the equals sign special names.

cgi and perl The left-hand side is called an lvalue while the right hand side is called an rvalue. An rvalue is a calculated result and as specified above it takes on the strongest type of any number involved in the calculation. On the other hand the lvalue has a type that must be defined before it is used. That's what all those float fahr, celsius; statements are doing. Once the type of an lvalue is defined it never changes.

cgi and perl

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cgi and perl