双重循环打印顶点在左上的直角三角形:
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public static void main(String[] args) {
// TODO Auto-generated method stub
int num= 0 ;
System.out.println( "请输入直角三角形的行数:" );
Scanner input= new Scanner(System.in);
num=input.nextInt();
for ( int i= 1 ;i<=num;i++){
for ( int k= 1 ;k<=num-i+ 1 ;k++){
System.out.print( "*" );
}
System.out.print( "\n" );
}
}
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打印顶点在左下的直角三角形
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public static void main(String[] args) {
int rows= 0 ;
System.out.println( "请输入要求的三角形的行数:" );
Scanner input= new Scanner(System.in);
rows=input.nextInt();
for ( int i= 1 ;i<=rows;i++){
for ( int j= 1 ;j<= 2 *i- 1 ;j++){
System.out.print( "*" );
}
System.out.print( "\n" );
}
}
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打印定点在右上的直角三角形
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public static void main(String[] args) {
int num= 0 ;
System.out.println( "请输入三角形所需要的行数:" );
Scanner input= new Scanner(System.in);
num=input.nextInt();
for ( int i= 1 ;i<=num;i++){
for ( int k=num;k>num-i+ 1 ;k--){
System.out.print( " " );
}
for ( int j=num;j>=i;j--){
System.out.print( "*" );
}
System.out.println();
}
System.out.println();
}
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打印定点在右下的直角三角形
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public static void main(String[] args) {
int num= 0 ;
System.out.println( "请输入打印的三角形行数:" );
Scanner input= new Scanner(System.in);
num=input.nextInt();
for ( int i= 1 ;i<=num;i++){
for ( int k=num;k> 0 ;k--){
if (k<=i){
System.out.print( "*" );
} else {
System.out.print( " " );
}
}
System.out.println();
}
}
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打印顶点在上的等腰三角形:
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public static void main(String[] args) {
int num= 0 ;
System.out.println( "请输入要打印三角形的行数:" );
Scanner input= new Scanner(System.in);
num=input.nextInt();
for ( int i= 1 ;i<=num;i++){
for ( int k= 0 ;k<=num-i;k++){
System.out.print( " " );
}
for ( int j= 1 ;j<= 2 *i- 1 ;j++){
System.out.print( "*" );
}
System.out.print( "\n" );
}
}
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打印顶点在下的等腰三角形
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public static void main(String[] args) {
int num= 0 ;
System.out.println( "请输入要求的三角形行数:" );
Scanner input= new Scanner(System.in);
num=input.nextInt();
for ( int i= 1 ;i<=num;i++){
for ( int m=num- 1 ;m>num-i;m--){
System.out.print( " " );
}
for ( int j=num;j>=i;j--){
System.out.print( "* " );
}
System.out.println();
}
}
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打印矩形
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public static void main(String[] args) {
for ( int i= 0 ;i< 5 ;i++){
for ( int j= 0 ;j< 5 ;j++){
System.out.print( "*" );
}
System.out.print( "\n" );
}
}
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打印空心菱形和实心菱形
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public static void main(String[] args) {
int hangshu = 11 ;
int yiban = hangshu / 2 + 1 ;
int yibanduo = hangshu / 2 ;
System.out. println ( "空心菱形:" );
for( int k = 1 ;k <= yiban;k++){
for( int i = 1 ;i <= (yiban - k);i++){
System.out. print ( " " );
}
System.out. print ( "*" );
for( int i = 1 ;i <= ( (k - 2 ) * 2 + 1 );i++){
System.out. print ( " " );
}
if (k != 1 ){
System.out. print ( "*" );
}
System.out. println ();
}
for( int k = yibanduo;k >= 1 ;k--){
for( int i = 1 ;i <= (yiban - k);i++){
System.out. print ( " " );
}
System.out. print ( "*" );
for( int i = 1 ;i <= ( (k - 2 ) * 2 + 1 );i++){
System.out. print ( " " );
}
if (k != 1 ){
System.out. print ( "*" );
}
System.out. println ();
}
System.out. println ( "实心菱形:" );
for( int i = 1 ;i <= hangshu;i++){
if (i <= hangshu/ 2 + 1 ){
for( int k = 1 ;k <= hangshu/ 2 + 1 - i;k++){
System.out. print ( " " );
}
for( int k = 1 ;k <= i;k++){
System.out. print ( "* " );
}
System.out. println ();
} else {
for( int k = 1 ;k <= (i -(hangshu/ 2 + 1 ));k++){
System.out. print ( " " );
}
for( int k = 1 ;k <= ( 2 *(hangshu/ 2 + 1 ) - i);k++){
System.out. print ( "* " );
}
System.out. println ();
}
}
}
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打印平行四边形
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public static void main(String[] args) {
for ( int i = 0 ; i < 5 ; i++) { //打印行
for ( int j = 0 ; j < 4 -i; j++) { //打印空格
System.out.print( " " ); //引号中间加空格
}
for ( int j = 0 ; j < 6 ; j++) { //打印列
System.out.print( "*" );
}
System.out.println(); //换行
}
}
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打印九九乘法表
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public static void main(String[] args) {
int num= 9 ;
for ( int i= 1 ;i<=num;i++){
for ( int j= 1 ;j<=i;j++){
System.out.print(j+ "*" +i+ "=" +j*i+ " " );
}
System.out.println();
}
}
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九九除法表
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public class TestNineNine {
public static void main(String[] args) {
for ( int b= 1 ;b<= 9 ;b++) {
for ( int a= 1 ;a<= 9 ;a++) {
int c = a*b;
System.out.print(c+ "/" +a+ "=" +b+ "\t" );
}
System.out.println();
}
}
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总结
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原文链接:http://blog.csdn.net/qq_38070608/article/details/78469410