Input n to print the triangle (for example, n = 3, n = 4, n = 5) 1 <= n <= 26

Package demo; public class printdemo {public static void main (string [] ARGs) {print (26);} Private Static void print (int I) {if (I <1 | I> 26) {return;} Int J, J2; For (j = 1; j <= I; j ++) {for (J2 = 1; J2 <= I; J2 ++) {If (J + J2 <= I) {system. out. print ("");} else {system. out. print (char) (64 + J2) ;}for (J2 = I-1; J2> = 1; J2 --) {If (J + J2> I) {system. out. print (char) (64 + J2);} else {system. out. print ("") ;}} system. out. println ();}}}

Output result:

Three points:

1. Do not write system. Out. Print () as system. Out. println.

2. If the operation is performed on the diagonal line, use if to determine.

3. Generally, two-tier loops control the number of rows in the outer loop. External Loop variables must exist in the internal loop!

Input N, printed triangle (for example, n = 3, n = 4, n = 5) 1 <= n <= 26