#include<stdio.h>
void main()
{
long int n,t,s1=0,s2,sum=0;
int a[12];
printf("Enter the account no..");
scanf("%ld",&n);
t=n;
int i=11;
while(n!=0)
{
a[i]=n%10;
if(i%2!=0)
{
s1+=(a[i]);
}
else
{
a[i]*=2;
s2=0;
while(a[i]!=0)
{
s2+=a[i]%10;
a[i]/=10;
}
sum+=s2;
}
n/=10;
i--;
}
sum+=s1;
if(sum%10==0)
printf("\nThe Entered no is a valid Account Number..");
else
printf("\nThe Entered no is not a valid Account Number..");
}
void main()
{
long int n,t,s1=0,s2,sum=0;
int a[12];
printf("Enter the account no..");
scanf("%ld",&n);
t=n;
int i=11;
while(n!=0)
{
a[i]=n%10;
if(i%2!=0)
{
s1+=(a[i]);
}
else
{
a[i]*=2;
s2=0;
while(a[i]!=0)
{
s2+=a[i]%10;
a[i]/=10;
}
sum+=s2;
}
n/=10;
i--;
}
sum+=s1;
if(sum%10==0)
printf("\nThe Entered no is a valid Account Number..");
else
printf("\nThe Entered no is not a valid Account Number..");
}
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