C语言实现输入字母判断是星期几

C语言实现输入字母判断是星期几
请输入星期几的第一个字母来判断一下是星期几，如果第一个字母一样，则继续判断第二个字母。 例如： 程序运行时，提示你"please input first character:" 你输入’f’或者’F’，则程序输出"Friday"， 你输入s，则程序进一步提示你"Please input second character:" 此时还需要进一步输入u，程序才输出"Sunday" 如果你输入的字母和任何星期的英文单词首字母都不匹配，则程序需要提示"Illegal input!n"。

#include "stdio.h" 
int main(void)
{
	char i,j;
	scanf("%c",&i);
	if(i>='a'&&i <='z') i=i-32;
	if(i>='A'&&i <='Z'){
		if(i=='M')
			printf("Monday");
		else if(i=='W')
			printf("Wednesday");
		else if(i=='F')
			printf("Friday");
		else if(i=='S'||i=='T'){
			scanf(" %c",&j);
			if(i=='S'&&j=='u')
				printf("Sunday");
			else if(i=='S'&&j=='a')
				printf("Saturday");
			else if(i=='T'&&j=='u')
				printf("Tuesday");
			else if(i=='T'&&j=='h')
				printf("Thursday");
			else
				printf("illegal input!n");
		}
		else
			printf("illegal input!n");
	}
}

#include "stdio.h"
int main() {
// your code
  char week1,week2;
  scanf("%c",&week1);
  if (week1=='M'||week1=='m')
  {
    printf("Monday");
  } 
  else if (week1=='W'||week1=='w')
  {
    printf("Wednesday");
  }
  else if (week1=='F'||week1=='f')
  {
    printf("Friday");
  }
  else if (week1=='T'||week1=='t')
  {
    scanf(" %c",&week2);
    if (week2=='U'||week2=='u')
    {
      printf("Tuesday");
    }
    else if (week2=='H'||week2=='h')
    {
      printf("Thursday");
    }   
  }
  else if (week1=='S'||week1=='s')
  {
    scanf(" %c",&week2);
    if (week2=='A'||week2=='a')
    {
      printf("Saturday");
    }
    else if (week2=='U'||week2=='u')
    {
      printf("Sunday");
    }   
  }
  else
  {
    printf("illegal input!n");
  }
}