c++ - Is there a quick way to check if a string is numeric? -


is possible check if string variable entirely numeric? know can iterate through alphabets check non-numeric character, there other way?

the quickest way can think of try cast "strtol" or similar functions , see whether can convert entire string:

char* numberstring = "100"; char* endptr; long number = strtol(numberstring, &endptr, 10); if (*endptr) {     // cast failed } else {     // cast succeeded }

this topic discussed in thread: how determine if string number c++?

hope helps :)


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