模拟实现printf

#include<stdio.h>
#include<stdarg.h>
void display(int tmp)
{
	 if(tmp > 9)
	{
		display(tmp / 10);
	}
	putchar(tmp % 10 + '0');
}
void print(const char *format, ...)
{
	va_list arg;
	va_start(arg, format);
	while ((*format) != '\0')
	{
		switch (*format)
		{
		case 'c':
		{
			char tm = va_arg(arg, char);
			putchar(tm);
			break;
		}
		case 's':
		{
			char* tmp = va_arg(arg, char*);
			while ((*tmp) != '\0')
			{
				putchar(*tmp);
				tmp++;
			}
		}
		break;
		case 'd':
		{
			int tmp = va_arg(arg, int);
			display(tmp);
			break;
		}

		default:
		{
			putchar(*format);
		}
		}
		format++;
	}

}
int main()
{
	print("s ccc d.\n", "hello", 'b', 'i', 't',100);
	getchar();
	return 0;
}