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How to declare or use Variables in C++ ?

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Which of the following variable declarations are correct? If a variable declaration is not correct give the reason(s) and provide the correct variable declaration.

n = 12; //Line 1
char letter = ; //Line 2
int one = 5, two; //Line 3
double x, y, z; //Line 4

Line 3 and 4 are correct but what is wrong with Line 1 and Line 2?

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Solution Summary

The solution is comprised of examples which shows some common mistakes in variable declaration and definition.

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n = 12 //Line 1
* Undefined Symbol n
Remedy: declare it as an integer.
int n = 12;

char letter = ; //Line ...

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