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C Exercises: Check whether a number is a Duck Number or not

C Numbers: Exercise-23 with Solution

Write a program in C to check whether a number is a Duck Number or not.

Test Data
Input a number: 3210

Sample Solution:

C Code:

# include <stdio.h>
# include <stdlib.h>


int main()
{
    int dno,dkno,r,flg;
	flg=0;
 printf("\n\n Check whether a number is a Duck Number or not: \n");
 printf(" ----------------------------------------------------\n");
 printf(" Input a number: ");
 scanf("%d",&dkno);
 dno=dkno;
    while(dkno>0)
        {
            if(dkno % 10 == 0)
            {
            flg=1;
            break;
            }
			dkno/=10;
        }
            if(dno>0 && flg==1)
            {
             printf(" The given number is a Duck Number.\n");
            }
            else
            {
             printf(" The given number is not a Duck Number.\n");
            }
}

Sample Output: 

 Input a number: 3210                                                                                         
 The given number is a Duck Number.

Pictorial Presentation:

C programming: Check whether a number is a Duck Number or not.

Flowchart:

Flowchart: Check whether a number is a Duck Number or not

C Programming Code Editor:

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C Programming: Tips of the Day

Static variable inside of a function in C

The scope of variable is where the variable name can be seen. Here, x is visible only inside function foo().

The lifetime of a variable is the period over which it exists. If x were defined without the keyword static, the lifetime would be from the entry into foo() to the return from foo(); so it would be re-initialized to 5 on every call.

The keyword static acts to extend the lifetime of a variable to the lifetime of the programme; e.g. initialization occurs once and once only and then the variable retains its value - whatever it has come to be - over all future calls to foo().

Ref : https://bit.ly/3fOq7XP