﻿ C Program: Explain whether a number is Keith or not - w3resource

# C Exercises: Explain whether a number is Keith or not

## C Numbers: Exercise-37 with Solution

Write a program in C to check if a number is Keith or not (with explanation).

Test Data
Input a number : 1537

Sample Solution:

C Code:

``````# include <stdio.h>
# include <stdlib.h>
# include <stdbool.h>
# include <math.h>

int lenCount(int nm)
{  int ctr=0;
while(nm>0)
{
nm=nm/10;
ctr++;
}
return ctr;
}
int main()
{
int num1=0,arr1[10],num2=0,flg=0,i=0,sum=0,kk;
printf("\n\n Check whether a number is Keith or not: \n");
printf(" Sample Keith numbers: 197, 742, 1104, 1537, 2208, 2580, 3684, 4788, 7385..\n");
printf(" -----------------------------------------------------------------------\n");
printf(" Input a number : ");
scanf("%d",&num1);
num2=num1;
for(i=lenCount(num2)-1;i>=0;i--)
{
arr1[i]=num1 % 10;
num1/=10;
}
while(flg==0)
{
for(i=0;i<lenCount(num2);i++)
sum+=arr1[i];
if(sum==num2)
{
flg=1;
kk=1;
}
if(sum>num2)
{
flg=1;
kk=0;
}
for(i=0;i<lenCount(num2);i++)
{
printf(" %d",arr1[i]);
if(i!=lenCount(num2)-1)
{
arr1[i]=arr1[i+1];
printf(" + ");
}
else
{
arr1[i]=sum;
printf(" = %d",arr1[i]);
}
}
printf("\n");
sum=0;
}
if(kk==1)
{
printf(" The given number is a Keith Number.\n");
}
if(kk==0)
{
printf(" The given number is not a Keith Number.\n");
}
}
```
```

Sample Output:

``` Input a number : 1537
1 +  5 +  3 +  7 = 16
5 +  3 +  7 +  16 = 31
3 +  7 +  16 +  31 = 57
7 +  16 +  31 +  57 = 111
16 +  31 +  57 +  111 = 215
31 +  57 +  111 +  215 = 414
57 +  111 +  215 +  414 = 797
111 +  215 +  414 +  797 = 1537
The given number is a Keith Number.
```

Pictorial Presentation:

Flowchart:

C Programming Code Editor:

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﻿

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Try

```#include<string.h>

#define __FILENAME__ (strrchr(__FILE__, '/') ? strrchr(__FILE__, '/') + 1 : __FILE__)
For Windows use '\\' instead of '/'.
```

Ref: https://bit.ly/3mOf045

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