Created
March 16, 2012 23:25
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Lychrel numbers
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| #include <stdio.h> | |
| #include <stdlib.h> | |
| #include <stdbool.h> | |
| bool palindrome ( unsigned long long int i ); | |
| unsigned long long int reverse ( unsigned long long int i ); | |
| bool lychrel ( unsigned long long int i ); | |
| int main ( void ) | |
| { | |
| unsigned long long int i=0; | |
| int count=0; | |
| for(i=1;i<10000;i++) | |
| { | |
| if(lychrel(i)) | |
| { | |
| count++; | |
| } | |
| } | |
| printf("\n\%d\n", count); | |
| return 0; | |
| } | |
| bool lychrel ( unsigned long long int i ) | |
| { | |
| int j; /*iteration counter*/ | |
| bool lychrel = true; | |
| i = i + reverse ( i ); | |
| for ( j = 1; j <= 30 ; j++ ) | |
| { | |
| if ( palindrome ( i ) ) | |
| { | |
| lychrel = false; | |
| break; | |
| } | |
| i = i + reverse ( i ); | |
| } | |
| return lychrel; | |
| } | |
| unsigned long long int reverse ( unsigned long long int i ) | |
| { | |
| unsigned long long int ret = 0; | |
| while ( i != 0 ) | |
| { | |
| ret *= 10; | |
| ret += i % 10; | |
| i /= 10; | |
| } | |
| return ret; | |
| } | |
| bool palindrome ( unsigned long long int i ) | |
| { | |
| return ( i == reverse ( i ) ); | |
| } |
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