CS2931 -  Fall 2003 - Some Common Errors in C
More will be added as we proceed: 
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The char 'x' is not a string "x".
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= is not = = ; & is not && etc.
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left association effects: 
a < b < c is meaningful, but not as the conjunction of inequalities
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& is required for scanf(); it and printf() expect string, not char arguments;
both require: #conversions = #arguments
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avoid overflow when using INT_MAX eg use i < INT_MAX-j, NOT  i + j < INT_MAX