c语言 4-25输出向下的金字塔

#include <stdio.h>

int main(void)
{
    int i, j, layer;
    puts("please input the layer");
    printf("layer = "); scanf("%d", &layer);
    
    for(i = 1; i <= layer; i++)
    {
        for(j = 1; j <= i - 1; j++)
        {
            putchar(‘ ‘);
        }
        for(j = 1; j <= (layer -i) * 2 + 1; j++)
        {
            printf("%d", i%10);
        }
        putchar(‘\n‘);
    }
    return 0;
}