实验二刘子余

`//ex1.cpp

include<stdio.h>

int main(){
int a=5, b=7,c=100,d,e,f;
d=a/bc;
e=ac/b;
f=c/b*a;
printf("d=%d,e-%d,f=%d\n",d,e,f);
return 0;

`//ex2.cpp

include<stdio.h>

int main(){

int x=1234;
float f=123.456;
double m=123.456;
char ch='a';
char a[]="hello,world!";//定义一个数组啊，数组中存放字符串常量hallo,world!
int y=3,z=4;
printf("%d %d\n",y,z);
printf("y=%d,z=%d\n",y,z);
printf("%8d,%2d\n",x,x);
printf("%f,,%8f,%8.1f,%0.2f,%.2e\n",f,f,f,f,f);
printf("%1f\n",m);
printf("%3c\n",ch);
printf("%S\n%15s\n%10.5s\n%2.5s\n%.3s\n",a,a,a,a,a);
return 0;`

`#include<stdio.h>
int main (){
double x,y;
char c1,c2,c3;
int a1,a2,a3;

scanf("%d%d%d",&a1,&a2,&a3);
printf("%d,%d,%d\n",a1,a2,a3);
scanf("%c%c%c",&c1,&c2,&c3);
printf("%c,%c,%c\n",c1,c2,c3);
scanf("%lf,%lf",&x,&y);
printf("%lf,%lf\n",x,y);

return 0;
}![](https://img2020.cnblogs.com/blog/2184252/202011/2184252-20201108212359783-988690321.png)#include <stdio.h>
int main(){
char x;
x=getchar();

if(x>='0'&&x<='9')
printf("%c是数字字符\n",x);
else if(x>='a'&&x<='z'||x>='A'&&x<='Z')
printf("%c是英文字母\n",x);
else
printf("%c是其他字符\n",x);
return 0;
}`