[C++知识库]PTA1027-C语言-打印沙漏

#include <stdio.h>
void print_fuhao(int a, int b, char c)//a fuhaoshulaing ,b konggeshuliang
{
    int i;
    for(i = 1; i <= b/2; i ++)
        printf(" ");
    for(i = 1; i <= a; i ++)
        printf("%c",c);
    printf("\n");
}
int main()
{
    int N;
    char s;
    scanf("%d %c",&N,&s);
    int i = 1;
    int sum = 0;
    //===================================
    if(N%2 == 0) //even
    {
        while (sum <= (N/2) )
        {
            sum = i + sum;
            i +=2;
        }
    }
    else
    {
        while(sum <= (N+1)/2 )
        {
            sum = i + sum;
            i += 2;
        }
    }
    int cengshu;
    cengshu  = (i - 4)/2 + 1;
    //=====================printf
    int j;
    for(i = 1; i <= cengshu*2 - 1; i ++)
    {
        if(i <= cengshu)
        {
            print_fuhao((cengshu+1-i)*2-1,(i-1)*2,s);
        }
        else
        {
            j = cengshu*2 - i;
            print_fuhao((cengshu+1-j)*2-1,(j-1)*2,s);
        }
    }
    //=======================the number of no use
    int use_sum = 0 ;
    use_sum = ((1 + (cengshu*2 -1))*cengshu/2 - 1)*2 + 1;
    //=============================================
    printf("%d\n",N - use_sum);
    return 0;
}