Any time a pointer is used as a condition, it means ?Is this a non-null pointer?? A pointer can be used in an if, while, for, or do/while statement, or in a conditional expression.

A pointer in an if statement is normal, and may have many meanings, not just limited to non-null. It may mean
- whether two pointers are the same;
- whether the pointer pointed value is a special value, like if((*p)==1);
- if the pointer is char *, more string related function calling may appeared, like if(strcmp(a,b))

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