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Isdigit

Item Value Header filectype.h Declarationint isdigit(int ch); Returnreturns nonzero if ch is a digit or zero is returned. #include <ctype.h>   #include <stdio.h>   int main(void)   {     char ch;     for(;;) {       ch = getchar();       if(ch == '.'){           break;       }       if(isdigit(ch)){           printf("%c is a digit\n", ch);       }     }     return 0;   } 1 1 is a digit 2 2 is a digit 3 3 is a digit f .