- for循环
- 九九乘法表
- 等腰三角形
- 菱形
- 沙漏
外层for控制每一列的数
内层fou控制每一行的数
for(int i=1;i<=9;i++){
for(int j=1;j<=i;j++){
System.out.print(j+"*"+i"="+(j*i)" ");
}
System.out.println();
}
1*1=1 1*2=2 2*2=4 1*3=3 2*3=6 3*3=9 1*4=4 2*4=8 3*4=12 4*4=16 1*5=5 2*5=10 3*5=15 4*5=20 5*5=25 1*6=6 2*6=12 3*6=18 4*6=24 5*6=30 6*6=36 1*7=7 2*7=14 3*7=21 4*7=28 5*7=35 6*7=42 7*7=49 1*8=8 2*8=16 3*8=24 4*8=32 5*8=40 6*8=48 7*8=56 8*8=64 1*9=9 2*9=18 3*9=27 4*9=36 5*9=45 6*9=54 7*9=63 8*9=72 9*9=81等腰三角形
for(int i=1;i<=9;i++){
for(int j=9;j>=i;j--){
System.out.print("*");
}
for(int k=1;k<=2*i-1;k++){
System.out.print("0");
}
System.out.println();
}
*********0 ********000 *******00000 ******0000000 *****000000000 ****00000000000 ***0000000000000 **000000000000000 *00000000000000000菱形
for (int i = 1; i <=9; i++) {
for (int j = 9; j >=i; j--) {
System.out.print("*");
}
for (int k = 1; k <= 2*i-1; k++) {
System.out.print("0");
}
System.out.println();
}
for (int i = 1; i <= 9; i++) {
for (int j = 1; j <=i; j++) {
System.out.print("*");
}
for (int j = 9*2; j >=i*2 ; j--) {
System.out.print("0");
}
System.out.println();
}
*********0 ********000 *******00000 ******0000000 *****000000000 ****00000000000 ***0000000000000 **000000000000000 *00000000000000000 *00000000000000000 **000000000000000 ***0000000000000 ****00000000000 *****000000000 ******0000000 *******00000 ********000 *********0沙漏
for (int i = 1; i <= 9; i++) {
for (int j = 1; j <=i; j++) {
System.out.print("*");
}
for (int j = 9*2; j >=i*2 ; j--) {
System.out.print("0");
}
System.out.println();
}
for (int i = 1; i <=9; i++) {
for (int j = 9; j >=i; j--) {
System.out.print("*");
}
for (int k = 1; k <= 2*i-1; k++) {
System.out.print("0");
}
System.out.println();
}
*00000000000000000 **000000000000000 ***0000000000000 ****00000000000 *****000000000 ******0000000 *******00000 ********000 *********0 *********0 ********000 *******00000 ******0000000 *****000000000 ****00000000000 ***0000000000000 **000000000000000 *00000000000000000
