UVa OJ - 488 Triangle Wave

The following program is my ACcepted code for UVA-488.
It's a for everybody to learn and discuss.
If there is any mistake or comment, please let me know.  :D

此乃UAV 488的AC code!
歡迎一同討論學習，如有錯誤與任何建議請留言 : )

//This program is for UVa 488 Triangle Wave
//http://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=6&page=show_problem&problem=429


/*
a very simple problem
one trick is the note:
NOTE: There is a blank line after each separate waveform, excluding the last one.
Therefore, we should set condition to control the blank line
*/

#include<stdio.h>
#include<iostream>
using namespace std;

/*
    input integer Amplitude and Frequency
    print the outcomes as problem described
*/
void wave(int amp, int fre)
{
    for(int i=0; i<fre; i++)
    {
       
        for(int j=1 ; j<=amp; j++)
        {
            for(int k=1; k<=j; k++)
                printf("%d",j);
            printf("\n");
        }
       
        for(int j=amp-1 ; j>0; j--)
        {
            for(int k=1; k<=j; k++)
                printf("%d",j);
            printf("\n");
        }
        if(i != fre-1)
            printf("\n");
    }
   
}

int main()
{
    int n, x, y;
   
    scanf("%d", &n);
   
    for(int i=0; i<n; i++)  
    {
        scanf("%d %d", &x, &y);
        wave(x, y);
       
        if(i != n-1)
            printf("\n");
    }
   
    return 0;
}