in | !out )return 0;for( i = 0 ; i < length ; i++ ){out[i] = ( in[i] + n ) % 26;}return 1;}unsigned caesar_decryption(char* in, char* out, int n, int length){int i = 0;if( !in | !out )return 0;for( i = 0 ; i < length ; i++ ){out[i] ...