实验1

#include<stdio.h>
int main()
{
    printf("201983270491");
    return 0;
 } 

#include<stdio.h>
int main()
{
    printf("hello,火星");
    return 0;
 } 

#include<stdio.h>
int product (int,int);
int main (void)
{
    int x,y,s;
    scanf("%d %d",&x,&y);
    s=product(x,y);
    printf("The mul is:%d",s);
    return 0;
}
int product(int a,int b)
{
    int mul;
    mul=a*b;
    return mul;
}

#include<stdio.h>
int main()
{
    int a=5,b=7,c=100,d,e,f;
    d=a/b*c;
    e=a*c/b;
    f=c/b*a;
    printf("d=%d,e=%d,f=%d\n",d,e,f);
    return 0;
    
}

#include<stdio.h>
int main()
{
    int a=5,b=8;
    printf("a++=%d\n",a++);
    printf("a=%d\n",a);
    printf("++b=%d\n",++b);
    printf("b=%d\n",b);
    return 0;
    
}

#include<stdio.h>
int main()
{
    int a=5,b=8,c=8;
    printf("%d,%d,%d,%d\n",a==b&&a==c,a!=b&&a!=c,a>=b&&a>=c,a<=b&&a<=c);
    printf("%d,%d\n",a<=b||a>=c,a==b||b==c);
    printf("%d,%d,%d,%d\n",!(a==b),!(a>=b),!(a>=c),!(a<=b));
    return 0;
}

 #include <stdio.h> 
  int main() {
      int x;
      printf("输入一个整数: \n");
      scanf("%d",&x);
      if("x%2==1") 
          printf("是奇数");
      else
          printf("是偶数"); 
      
      return 0;
  } 

  #include <stdio.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(days==6||days==7) 
          printf("weekend, relax~\n");
      else
          printf("Ooops, not in 1~7\n");
      
      return 0;
  }

  #include <stdio.h>
  int main() {
      char ch;
      
      printf("输入一个字符:\n");
      scanf("%c",&ch);
      
      
      if(61<=ch&&ch<=122)  
          ch=ch-32;
                
      
      printf("%c\n",ch);
      
      return 0;
  }