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Hi guys, can anybody explain to me with a example why we people emphasize to pass double pointer in a function instead a single pointer when we want to fill some variable inside that function. or what are thge advantage of double pointers in c over single pointer?
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how to check there exist number in string using isalpha.if number exist, display "only alphabetic,please input again" example : user input = i had to 2 number 
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