5. Declarations
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 All variables must be declared before use, although certain declarations can be made implicitly by content. |
| The general format for a declaration is |
| type variable-name [=value]. |
| Examples: |
| – char x; |
/* uninitialized */ |
| – char x=’A’; /* initialized to ’A’*/ |
| – char x=’A’, y=’B’; |
/*multiple variables initialized */ |
| – char x=y=’Z’; |
/*multiple initializations */ |
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| Are the following declarations right? |
| int x=017; int y=12; /* is x>y? */ |
| short int s=0xFFFF12; /* correct? */ |
| char c=−1; unsigned char uc=−1; /* correct? */ |
| puts("hel"+"lo"); puts("hel""lo"); /* which is correct? */ |
| enum sz{S=0, L=3, XL}; /* what is the value of XL? */ |
| enum sz{S=0, L=−3, XL}; /* what is the value of XL? */ |
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