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How do you check whether a character is numeric in an alphanumeric field in C?
Wiki User
∙ 8y ago
If the character's ASCII value is in the range of the digit characters, then it is a numeric. In ASCII, the range of digits is from '0' to '9' (48 to 57 decimal). Note that character constants such as '0' will implicitly convert to the constant integer 48 (the ASCII code for the character) so there is no need to remember the actual value; the compiler can determine this for us.
The following function shows how one might test a character to see if it is a digit or not:
bool is_digit (const char c) {
return (c>='0' && c<='9');
}
The function will return true if the given character is a digit, otherwise it will return false.
Wiki User
∙ 8y ago
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