diamond图形

#include <stdio.h>
#include <stdlib.h>

void diamond(int , char);

int main(void)
{
    int n ,a;
    n = 5;
    a = '+';
    diamond(n,a);
    return 0;
}

void diamond(int x, char y)
{
    if(!x%2)
        printf("Please input even ");
    int i,j;
    for (i=1; i <=x; i++){
        for (j=1; j<=x-abs(i-x/2-1); j++){
            if (j >= abs(i-x/2-1)+1)
                printf("%c\t",y);
            else
                printf(" \t");
        }
        printf("\n");
    }
}