实验二

#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("%f,%lf",&x,&y); 
   printf("%f,%lf\n",x,y); 
  
  
   
    return 0; 
}

#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是其它字符\n", x);
    
 
    return 0;
} 

#include<stdio.h>
int main(){
   int sum,n,a;
   sum=1;
   a=2;
   scanf("%d",&n);
   if(n<='0'&&n>='10')
   {
   printf("calcuate wrong");
}
   else
   while(a<=n){
   a=a*2;
   sum=sum+a;
   
   }
   printf("n=%d时",n);printf("sum=%d\n",sum);
 
    return 0;
} 

好难好难555

#include <stdio.h>
int main(){
    int x=1234;  
    float f=123.456;
    double m=123.456;
    char ch='a';
    char a[]="Hello, 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("%lf\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(){
    char ans1, ans2;
    printf("复习了没? (输入y或Y表示复习了，输入n或N表示没复习) :  "); 
    ans1=getchar();
    getchar(); 
    printf("\n动手敲代码了没? (输入y或Y表示敲了，输入n或N表示木有敲) :  ");
    ans2 = getchar();
    if(ans1=='y'&&ans2=='y'||ans1=='y'&&ans2=='Y'||ans1=='Y'&&ans2=='y'||ans1=='Y'&&ans2=='Y') 
    printf("\n罗马不是一天建成的:)\n");
    else
    printf("\n罗马不是一天毁灭的。。。\n");
 
    return 0;
} 

#include <stdio.h>
int main(){
    int num;
     
    scanf("%d",&num);
    printf("2049%04d\n",num);
    
    scanf("%d",&num);
    printf("2049%04d\n",num);
    
    scanf("%d",&num);
    printf("2049%04d\n",num);
    
    return 0;
    
    
}