字母金字塔

源自<C Primer Plus>6-4

#include<stdio.h>
int main()
{
	int line, i, n;
	char a = 'A';
	char temp;
	printf("字母金字塔\n请输入一个大写字母：");
	scanf("%c", &temp);
	n = (int)(temp - 'A' + 1);
	for (line = 1; line <= n; line++)
	{
		for (i = 1; i <= n-line; i++)
		{
			printf(" ");
		}
		for (i = 1; i <= line; i++,a++)
		{
			printf("%c", a);
		}
		for (i = line - 1, a = a - 2; i > 0; i--, a--)
		{
			printf("%c", a);
		}
		printf("\n");
		a = 'A';
	}
	return 0;
}