Just learning, problem with an excercise.
I have to do a program that evaluates if the digits of a number are alternatingly evens and odds. Example = 23232, 1234, 9634, etc.
Code:
#include <stdio.h>
int main()
{
int a;
int cont=0;
printf("Ingrese un entero :");
scanf("%i",&a);
int temp=a;
while(temp>0)
{
temp=temp/10;
cont++;
}
printf("\n Número de dígitos : %d",cont);
int arr[cont], dig=(temp%10), i=0;
temp=a;
while (i<cont){
if (dig%2==0){
arr[i]=0;
i++;
temp=temp/10;
dig=temp%10;}
else if (dig%2!=0){
arr[i]=1;
i++;
temp=temp/10;
dig=temp%10;}
}
i=0;
int t=(i+1), alter;
while (i<cont){
if (arr[i]!=arr[t]){
alter=1;
i++;
t++;}
else{
alter=0;
i++;
t++;}
}
if (alter==1)
printf ("\n El número sí es alternante");
else
printf ("\n El número no es alternante");
i=0; // I did this to see if it detection of even or odds worked right
while (i<cont){
printf ("\n %i (0=par, 1=impar)", arr[i]);
i++;
}
}
The problem is that in this part:
Code:
while (i<cont){
if (dig%2==0){
arr[i]=0;
i++;
temp=temp/10;
dig=temp%10;}
else if (dig%2!=0){
arr[i]=1;
i++;
temp=temp/10;
dig=temp%10;}
}
The first digit to enter will always be taken as an even one, and I don't know why.
