C语言学习Day05

5-1

#include <stdio.h> 

int main()

{

	//第一个

	printf("\\中华人民共和国\\"); 

	printf("中\t国\t欢\t迎\t你"); 

	

	return 0;

}

5-2

/*

	1.算术运算符  + - * / % ++ -- 

		++i --i:先加、减，后用

		i++ i--:先用，后减 

*/ 

#include  <stdio.h>

int main() 

{

	int i1 = 6 , i2 = 12 , i3 = 50 , y;

	y = i1++;//i1 = 7 y = 6

	printf("y = %d \n" , y);//y = 6

	printf("i1 = %d \n\n" , i1);//i1 = 7

	

	//

	y = ++i1;//y = 8

	printf("y = %d \n" , y);

	printf("i1 = %d \n\n" , i1);

	

	y = i2--;

	printf("y = %d \n" , y);//

	printf("i2 = %d\n\n" , i2);

	

	y = --i3;

	printf("y = %d \n" , y);

	printf("i2 = %d\n" , i3);//

	//5++;//i = 5 i = 6 i = 7

	 

}