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ï¼ä¸ï¼è®¾æåé说æè¯å¥int a=8,b,c,d;float x=5.2 ,y,z;æ±ä¸å表达å¼çå¼ï¼
(1)b=5>14||x>2.5
=> 5>14||x>2.5 = 0||1=1
(2)!(a<x)
=>!(8<5.2)=!(0)=1
(3)c='\24'+5
=> \24æ¯
8è¿å¶24 å³
åè¿å¶20 æ以c=25
(4)b=x+a%3+x/2
=>b=x+a%3+x/2=5.2+8%3+5.2/2=5.2+2+2.6=(int)9.8=9
ï¼äºï¼è®¾æåé说æè¯å¥int a=3,b=4,c=5;æ±åºä¸å表达å¼çå¼ï¼
(5) a+b>c&&b==c 0
=>b==c为0 左边ä¸ç¨ç®ï¼ç»æ为0
(6) a||b+c&&b>c 1
=>1
(7) !a||!c||b
=>!3||!4||5=1
(8) a*b&&c+a
=>1
ï¼ä¸ï¼è®¾æåé说æè¯å¥int a=3,*pi=&aï¼æ±åºä¸å表达å¼çå¼ï¼
(9) *pi+a
=>6 *è¿ç®ä¼å
äº+,æ以å
åå¼ï¼åå ï¼å³3+3=6
(10) *pi++
=> 3 æå°çå®é
ä¸å°±æ¯*piï¼ å¨æå°ç»æåpiæéä¼å++è¿ç®ï¼ä½æ¯å·²ç»åé¢ç®æ å
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(1)void main()
{
float x,y;
int a,b;
x=3.1415;
a=y=b=x;
printf("%d %d %f %f",a,b,x,y);//è¿éæéäºï¼åºè¯¥æ¯printf
}
=>è¾åº3 3 3.141500 3.000000
ä»å³å¾å·¦ç®ï¼b=xåæ´ä¸º3 y=b为3 a=y为3 è¾åºæ´æ°ä¸º3ï¼
æµ®ç¹æ°é»è®¤å¸¦6ä½å°æ°
(2)
void main()
{ int i=1;
while(i<=100)
i++;
printf("%d",i);//iåºä¸ºå°å
}
=>101
(3)
void main()
{
int a[10]={10,2,3,1,5,6,7,8,-1,-10},i,j,t;
for(i=0;i<9;i++)
for(j=i+1;j<10;j++)
if(a[j]>a[i])
{ t=a[j];a[j]=a[i];a[i]=t;
}
for(i=0;i<10;i++) printf("%d ",a[i]);
}
=>10 8 7 6 5 3 2 1 -1 -10
=>å°±æ¯ä»å¤§å°å°æåºç¶åè¾åº 注æ%dåé¢æç©ºæ ¼ï¼æ以è¾åºä¹æç©ºæ ¼é´é
(4)
void main()
{
char a[]="I am a student.";
int i=0;
while(a[i]!=0)
putchar(a[i++]);
}
=>I am a student.
=>å°±æ¯ææ°ç»æä½è¾åº
(5)
void main()
{
int a=5,b=6,c;
int *p1,*p2,*p3=&c;
*p1=&a;//è¿éåºè¯¥æ¯ p1=&a ä¸ç¶åå§åæ¶å¯¹p1没æå®ä¹å¼ï¼ç´æ¥*p1ä¼ç¨åºå´©æº
*p2=&b; //åºè¯¥æ¯p2=&b, çç±åä¸
*p3=*p1;
*p1=*p2;
*p2=*p3;
cout<<a<<'\t'<<b;
}
=>å¦ææç
§p1 = &a; p2=&b计ç®ï¼é£ä¹è¾åº
=>6 5
=>注æå¨6 5ä¸é´æä¸ä¸ªtabï¼æ°´å¹³
å¶è¡¨ç¬¦ï¼
=>ab交æ¢å¼
(6)
int min(int a,int b)
{
return(a>b?b,a);//è¿éçéå·åºè¯¥æ¯åå· a>b?b:a åè¾å°å¼
}
void main()
{
int x=5,y=6; //intåxä¸é´è¦æä¸ä¸ªç©ºæ ¼
printf("%d %d \n",x,y);
printf("%d",min(x,y));
}
=>è¾åº
5 6
5
=>注æè¾åºæ两è¡ï¼ç¬¬ä¸è¡æ°åä¸é´æä¸ä¸ªç©ºæ ¼