实验1

#include<stdio.h>
int main()
{
	printf("201983270458\n");
	printf("hello ,world");
	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<=5)
	printf("weekdays,fighting\n");
	else if(days==7,days==6)
	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(ch>=65&&ch<=90)
	ch+=32; 
	printf("%c\n",ch);
	return 0;
}