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Int isalnum(int ch)

//Declaration: int isalnum(int ch); //Return: returns nonzero if its argument is either a letter of the alphabet or a digit. returns zero if the character is not alphanumeric. #include <ctype.h> #include <stdio.h> int main(void) { char ch; printf(". to exit:"); for(;;) { ch = getc(stdin); if(ch == '.') break; if(isalnum(ch)) printf("%c is alphanumeric\n", ch); } return 0; }