Question

Write a c program that will return 1 if the argument passed is a digit and zero otherwise.

Use the following function int isNumber(char *c) to do that.

Do not use && or || logical operator.

Write a full c program that has the header required and will accept the user entry.

Answer 1

CODE :

#include <stdio.h> //standard header
//isNumber function that return 1 if character is digit otherwise it will return 0
int isNumber(char *c)
{
    int n=0;
    if(*c>='0') //if it is greater or equal to 0
    {
        if(*c<='9') //if it is less than or equal 9
        {
            n=1; //digit
        }
        else //if not digit
        {
            n=0;
        }
      
    }
    return n;
}
int main()
{
   char ch;
   printf("Enter input:");
   scanf("%c",&ch); //reading character from the user
   printf("%d",isNumber(&ch)); //calling function isNumber
}

CODE SCREENSHOT:

OUTPUT:
RUN-1

RUN-2

RUN-3

RUN-4

RUN-5