java学习(一)---打印乘法表与三角

//java
public class ForDemo03 {
    public static void main(String[] args) {

        for (int j = 1;j <= 9;j++) {
            for (int i = 1; i <= j; i++) {
                System.out.print(j + "*" + i + "=" + (i * j) + "\t");
            }
            System.out.println();
        }
    }
}

//c
#include<stdio.h>
#include<stdlib.h>
int main(){
    int num1, num2;
    for (num1 = 1; num1 <= 9; num1++){
        for (num2 = 1; num2 <= num1; num2++){
            printf("%d*%d=%-3d", num1, num2, num1*num2);
        }
        printf("\n");
    }
    system("pause");
    return 0;
}

public class ForDemo04 {
    public static void main(String[] args) {
        for (int j = 1; j < 10; j++) {
            for (int i = 1; i <= 10-j; i++) {
                System.out.print(i+"*"+j+"="+(i*j)+"\t");
            }
            System.out.println();
        }
    }
}

#include<stdlib.h>
#include<stdio.h>
int main(){
    int num1, num2;
    for(num1 = 1; num1 <10; num1++){
        for(num2 = 1; num2 <= 10-num1; num2++){
           printf("%d*%d=%2d  ", num1, num2, num1*num2);
        }
        printf("\n");
    }
    system("pause");
    return 0;
}

public class TestDemo {
    public static void main(String[] args) {
        for (int i = 1; i <= 5; i++) {
            for (int j = 5; j>= i; j--) {
                System.out.print(" ");
            }for (int j = 1; j<= i; j++) {
                System.out.print("*");
            }for (int j = 1; j< i; j++) {
                System.out.print("*");
            }
            System.out.println();
        }
    }
}

#include<stdio.h>
int main(){
   int i,j;
   for(i=1;i<=5;i++){
        for(j=1;j<=9-i;j++){
            printf(" ");
        }
        for(j=1;j<=2*i-1;j++){
            printf("*");
        }
        printf("\n");
    }
    return 0;
}