C Language Program Development Classic example of the four

Program 31 "

Question: Please enter the first letter of the week to determine the day of the week, and if the first letter is the same, continue to judge the second letter.

1. Procedure analysis: Use the situation statement is better, if the first letter is the same, then judge with the case statement or if statement to judge the second letter.

2. Program Source code:

#include <stdio.h>
void main()
{
　char letter;
　printf("please input the first letter of someday\n");
　while ((letter=getch())!='Y')/*当所按字母为Y时才结束*/
　{
　　switch (letter)
　　{
　　　case 'S':printf("please input second letter\n");
　　　　if((letter=getch())=='a')
　　　　　printf("saturday\n");
　　　　else if ((letter=getch())=='u')
　　　　　printf("sunday\n");
　　　　else printf("data error\n");
　　　　　break;
　　　case 'F':printf("friday\n");break;
　　　case 'M':printf("monday\n");break;
　　　case 'T':printf("please input second letter\n");
　　　　if((letter=getch())=='u')
　　　　　printf("tuesday\n");
　　　　else if ((letter=getch())=='h')
　　　　　printf("thursday\n");
　　　　else printf("data error\n");
　　　　　break;
　　　case 'W':printf("wednesday\n");break;
　　　default: printf("data error\n");
　　}
　}
}