题目：用*号输出字母C的图案。

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1.程序分析：可先用'*'号在纸上写出字母C，再分行输出。
2.程序源代码：
#include "stdio.h"
main()
{
printf("Hello C-world!\n");
printf(" ****\n");
printf(" *\n");
printf(" * \n");
printf(" ****\n");
}