Programme For Palindrome

Question

Hi, I want how to write Palindrome programme programme without using any string functions and without any loops like while,do while. Any one can tell simple way. Thanks In advance, MOULALI.

Brajesh Kumar · Answer

palindrome Program using recursion #include int checkPalindrome(int); int main(){ int num,sum; printf("Enter a number: "); scanf("%d",&num); sum = checkPalindrome(num); if(num==sum) printf("%d is a palindrome",num); else printf("%d is not a palindrome",num); return 0; } int checkPalindrome(int num){ static int sum=0,r; if(num!=0){ r=num%10; sum=sum*10+r; checkPalindrome(num/10); } return sum; } palindrome Program using Pointer #include int is_palindrome(char*); void copy_string(char*, char*); void reverse_string(char*); int string_length(char*); int compare_string(char*, char*); int main() { char string[100]; int result; printf("Enter a string
"); gets(string); result = is_palindrome(string); if ( result == 1 ) printf(""%s" is a palindrome string.
", string); else printf(""%s" is not a palindrome string.
", string); return 0; } int is_palindrome(char *string) { int check, length; char *reverse; length = string_length(string); reverse = (char*)malloc(length+1); copy_string(reverse, string); reverse_string(reverse); check = compare_string(string, reverse); free(reverse); if ( check == 0 ) return 1; else return 0; } int string_length(char *string) { int length = 0; while(*string) { length++; string++; } return length; } void copy_string(char *target, char *source) { while(*source) { *target = *source; source++; target++; } *target = '\0'; } void reverse_string(char *string) { int length, c; char *begin, *end, temp; length = string_length(string); begin = string; end = string; for ( c = 0 ; c end++; for ( c = 0 ; c temp = *end; *end = *begin; *begin = temp; begin++; end--; } } int compare_string(char *first, char *second) { while(*first==*second) { if ( *first == '\0' || *second == '\0' ) break; first++; second++; } if( *first == '\0' && *second == '\0' ) return 0; else return -1; }