User:Atlant/String symmetry.c

/* Forward routines * */ int  is_symmetrical( char string[] ); int main( int argc, char * argv[], char * envp[] ); void try_one( char string[] );
 * 1) include 
 * 2) include 

int main( int argc, char * argv[], char * envp[] ) {    try_one( "" ); try_one( "A" ); try_one( "AB" ); try_one( "AA" ); try_one( "ABC" ); try_one( "ABA" ); try_one( "ABCD" ); try_one( "ABBA" ); try_one( "ABBC" ); try_one( "ABCA" ); return( 0 ); }

void try_one( char string[] ) {    int status; status = is_symmetrical( string ); if (status) {        printf( "\"%s\" is symmetrical\n", string ); }    else {        printf( "\"%s\" isn't symmetrical\n", string ); }  }

int is_symmetrical( char string[] ) {    int i;     int j;     i = 0;                              // Position at first byte j = strlen(string)-1;              // Position at last byte while (i<j)                        // Until indices cross or coincide... {        if (string[i] != string[j]) return( 0 ); i++; j--; }    return( 1 ); }