#include <stdio.h> 
#include <stdlib.h> 
int main() 
{
int x;

printf("输入一个整数: \n");
scanf("%d",&x);

int y;
y = x%2;
if( y == 1) 
printf("是奇数");
else
printf("是偶数"); 
system("pause"); 

return 0;
}

 

 

 #include <stdio.h> 
  #include <stdlib.h> 
  int main() 
  {

      int days;
      
      printf("输入一个整数: \n");
      scanf("%d",&days);
      
     
      if(1<=days,days<=5) 
          printf("workdays, fighting\n");
      else if(6<=days,days<=7) 
          printf("weekend, relax~\n");
      else
          printf("Ooops, not in 1~7\n");
      system("pause"); 

      return 0;
  } 

 

 

 

 

 

 

#include <stdio.h>
  #include <stdlib.h>
  int main() {
      char ch;
      
      printf("输入一个字符:\n");
      scanf("%c",&ch);
      
      
      if('a'<=ch&&ch<='z')   
          ch = ch - 32;   
               
      
      printf("%c\n",ch);
      system("pause"); 
      return 0;
  }