Simple code example of java loop exercise

Author：Eve Cole Update Time：2024-11-18 19:00:02

★Print the multiplication table

Copy the code code as follows:

public class TestDemo {
public static void main(String[] args){
for(int b=1;b<10;b++){
for(int a=1;a<=b;a++)
System.out.print(a+"*"+b+"="+a*b+"/t");
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
*/

★Print triangles

Copy the code code as follows:

public class Test {
public static void main(String[] args){
printTriangle_1(5);
System.out.println("--------------");
printTriangle_2(5);
System.out.println("--------------");
printTriangle_3(5);
System.out.println("--------------");
printTriangle_4(5);

}

public static void printTriangle_1(int n){
for(int i=1;i<=n;i++){
for(int j=1;j<=i;j++){
System.out.print("*");
}
System.out.println("");
}
}
public static void printTriangle_2(int n){
for(int i=1;i<=n;i++){
for(int j=1;j<=n-i+1;j++)
System.out.print("*");
System.out.println("");
}

}
public static void printTriangle_3(int n){
for(int i=1;i<=n/2+1;i++){
for(int j=1;j<=i;j++)
System.out.print("*");
System.out.println("");
}
for(int i=1;i<=n/2;i++){
for(int j=1;j<=n/2-i+1;j++)
System.out.print("*");
System.out.println("");
}
}
public static void printTriangle_4(int n){
for(int i=1;i<=n;i++){//i represents the number of lines
for(int k=1;k<=ni;k++)//k represents the number of empties printed in the current line
System.out.print(" ");
for(int j=1;j<=2*i-1;j++)//j represents the currently printed * number
System.out.print("*");
System.out.println();
}
}

}
/*
*
**
***
****
*****
---------------
*****
****
***
**
*
---------------
*
**
***
**
*
---------------
*
***
*****
*******
*********

★Print all three-digit daffodil numbers

Copy the code code as follows:

public class Test {
public static void main(String[] args){
for(int i=100;i<1000;i++){
int x =i/100;
int y =i/10%10;
int z =i%10;
if(i==x*x*x+y*y*y+z*z*z)
System.out.println(i);
}
}
}
/*
153
370
371
407
*/