第3章 順序程序設計
1、輸入函數scanf的參數錯誤，應該為：scanf("%f",&k);
2、|1234?1234?|
3、ff10
4、1,3,1
5、原字符串
???左邊加空格再加字符串本省，字符個數總和為5個
6、scanf("%d,%d,%c,%c",&a1,&a2,&c1,&c2);
7、printf("a+b=%d\n",a+b);
???printf("a-b=%d\n",a-b);
???printf("a*b=%d\n",a*b);
???printf("a/b=%d\n",a/b);
???printf("(float)a/b=%f\n",(float)a/b);
???printf("a%b=%d\n",a%b);
8、void?main()
???{
?????float?r;
?????float?s,c;
?????printf("please?input?the?number:");
?????scanf("%f",&r);
?????if(r>=0)
?????{
????????s?=?3.14*r*r;
????????c?=?2*3.14*r;
????????printf("s?=?%f,?c?=?%f\n",s,c);
?????}
?????else
printf("you?input?number?is?error!");
???}
9、void?main()
{
???int?n;
???printf("please?input?the?number:");
???scanf("%d",&n);
???if(n>=100?&&?n?<=?999)
??????printf("%d%d%d",n%10,(n/10)%10,n/100);
???else
printf("you?input?number?is?error!");
}
10、void?main()
{
???int?i,j,k;
???scanf("%d,%d,%d",&i,&j,&k);
???((i%2?!=?0?1:0)?+?(j%2?!=?0?1:0)+(k%2?!=?0?1:0))?==?2?printf("YES\n"):printf("NO\n");
}
11、void?main()
{
??char?a;
??scanf("%c",&a);
??printf("%c,%c,%c",a-1,a,a+1);
??printf("%d,%d,%d",a-1,a,a+1);
}
12、void?main()
{
??float?a,b,c,s,Area;
??scanf("%f,%f,%f",&a,&b,&c);
??if(a+b?>?c?||?a+c?>?b?||?b+c?>a)
??{
???????s?=?(a+b+c)/2;
???????Area?=?sqrt(s*(s-a)*(s-b)*(s-c));
???????printf("%f\n",Area);
??}
??else
?????printf("you?input?the?number?is?error!\n");
}
第4章 選擇結構程序設計計
1：?0
?
2：?20
?
3：?????(x<30&&x>20)||(x<-100)
?
4:?***a=25,b=14,c=16***
?
5:?37
?
6:?if(a<=b)????printf("1");
else????????printf("2");
?
7、
#include<stdio.h>
void?main()
{?char?a,b,t1,t2;
scanf("%c,%c",&a,&b);
t1=a>b?a:b;
t2=a<b?a:b;
if((t1-t2)%2==0)printf("%c,%c",a+1,b+1);
else??printf("%c,%c",a-1,b-1);
getch();
}
8、
#include<stdio.h>
void?main()
{?int?temp1=0,temp2=0,x,y,i=1;
printf("Please?input?(x,y):??");
scanf("%d,%d",&x,&y);
while((i*y)<=x)
{?if(x==(i*y))?{temp1=1;break;}
temp2=i;
i++;
}
if(temp1)
printf("%d?/?%d?=?%d",x,y,i);
else
printf("%d?/?%d--->?shang=%d,yushu=%d",x,y,temp2,x-y*temp2);
getch();
}
9、
#include<stdio.h>
void?main()
{?float?x,y,m=0,n=0;
scanf("%f,%f",&x,&y);
n=(x-2)*(x-2);
m=(y-2)*(y-2);
if((m+n)<=1)
printf("(%.3f,%.3f)In?the?yuan",x,y);
else
printf("(%.3f,%.3f)out?of?the?yuan",x,y);
getch();
}
10、
#include<stdio.h>
void?main()
{?int?temp=0,month,year;
printf("Please?input?(year,month):???");
scanf("%d,%d",&year,&month);
if((year%400==0)||(year%4==0&&year%100!=0))
temp=1;
if(month==2)
{?if(temp)printf("%d?year?%d?month?have?29?",year,month);
else?printf("%d?year?%d?month?have?28?",year,month);
}
else?if(month%2==0)
printf("%d?year?%d?month?have?30?",year,month);
else????printf("%d?year?%d?month?have?31?",year,month);
getch();
}
11、
switch(a/10)
{?case?5:m=4;break;
case?4:m=3;break;
case?3:m=2;break;
case?2:m=1;break;
default:m=5;?
}
12、
方法一：
#include<stdio.h>
void?main()
{?int?x,y;
scanf("%d",&x);
if(x<0&&x>-5)
y=x-1;
else?if(x==0)
y=x;
else?if(x>0&&x<8)
y=x+1;
printf("%d",y);
getch();
}
方法二：
#include<stdio.h>
void?main()
{?int?x,y;
scanf("%d",&x);
if(x<8&&x>-5)
{?if(x==0)y=x;
else?if(x>0&&x<8)????y=y=x+1;
else?y=x-1;
printf("%d",y);
}
else????printf("Input?error!!!");
getch();
}
方法三：
#include<stdio.h>
void?main()
{?int?x,y,i;
scanf("%d",&x);
if(x<8&&x>-5)
{?if(x==0)i=1;
else?if(x>0&&x<8)???i=2;
else?i=3;
}
else????i=4;
switch(i)
{?case?1:y=x;printf("%d",y);break;
case?2:y=x+1;printf("%d",y);break;
case?3:y=x-1;printf("%d",y);break;
case?4:printf("Input?error!!");break;
}getch();
}
