isdigit example in C

Header file:

    ctype.h

Synopsis:

    int isdigit (int input)

Description:

    Checks whether the given input is a decimal digit or not

Return Value:

    TRUE(non-zero value) on success

    0 on failure.

isdigit function C example

  #include<stdio.h>
  #include<ctype.h>
  int main() {
        char c;
        printf("Enter your input:");
        c = getchar();
        if (isdigit(c))
                printf("The given input is a decimal digit\n");
        else
                printf("The given input is not a decimal digit\n");
        printf("Return value of isdigit: %d\n", isdigit(c));
        return 0;
  }

  Output:

  Enter your input:1
  The given input is a decimal digit
  Return value of isdigit: 2048