C——运用循环嵌套打印金字塔模型

#include<stdio.h>
int main(void)
{
    int i;
    int j;
    int k;
    char t1;
    printf("请输入一个大写字母：");
    scanf_s("%c", &t1);
    char t2 = ‘A‘;
    int x = t1 - ‘A‘ + 1;
    for (i = 1;i <= x;i++)
    {
        for (j = 1;j <= x-i;j++)//空格
            printf(" ");
        for (k = 1;k <= i;k++)//升序
            printf("%c",t2++);
        for (k = 1;k <= i - 1;k++)//降序
        {
            printf("%c", t2 - 2);
            t2--;
        }
        printf("\n");
        t2 = ‘A‘;
    }
    return 0;
}