2010 12 05

#include<stdio.h>
#if 0
void main()
{
 void average(float *p,int n);
 void search(float (*p)[4],int n);
 float a[3][4] = {65,67,70,60,80,87,90,81,90,99,100,98}; 
 average(*a,12);
 search(a,2);
}
void average(float *p,int n)
{
 float *end = p+n;
 float sum = 0,ave;
 for(;p<end;p++)
  sum += *p;
 ave = sum/n;
 printf("%.2f/n",ave);
}
void search(float (*p)[4],int n)
{
 int i;
 for(i = 0;i<4;i++)
  printf("%-7.2f",*(*(p+2)+i));
 printf("/n");
}
#endif

#if 0
void main()
{
 void search(float (*p)[4],int n);
 float a[3][4] = {65,57,70,60,58,87,90,81,90,99,100,98}; 
 search(a,3);
}

void search(float (*p)[4],int n)
{
 int i,j,flag;
 for(j = 0;j<n;j++)
 {
  flag = 0;
  for(i = 0;i<4;i++)
   if(*(*(p+j)+i) < 60)
    flag = 1;
   if(flag == 1)
   {
    for(i = 0;i<4;i++)
     printf("%-7.2f",*(*(p+j)+i));
    printf("/n");
   }
 }
}
#endif

#if 0
void main()
{
 //char s[20] = "Hello world!";
 //char *str;
 //str = s;

 //char *str;
 //str = "Hello world!";

 char *str = "Hello world!";
 
 puts(str);
}
#endif

#if 0
//copy
void main()
{
 char a[] = "Hello world!";
 char b[20];
 int i;
 for(i = 0;*(a+i) != '/0';i++)
  *(b+i) = *(a+i);
 *(b + i) = '/0';
 printf("String a :%s/n",a);
 printf("String b :%s/n",b);
}
#endif

#if 0
//copy  用指针变量
void main()
{
 char a[] = "Hello world!";
 char b[20];
 char *p,*q;
 p = a;
 q = b;

 for(;*p != '/0';p++,q++)
  *q = *p;
 *q = '/0';
 printf("String a :%s/n",a);
 printf("String b :%s/n",b);
}
#endif

#if 0
void main()
{
 void copy(char s1[],char s2[]);
 char a[] = "I am a teacher .";
 char b[] = "You are a student .";
 printf("string a :%s/nstring b :%s/n",a,b);
 printf("copy a to b ./n");
 copy(a,b);
 printf("string a :%s/nstring b :%s/n",a,b);
}
void copy(char s1[],char s2[])
{
 int i = 0;
 for(;s1[i]!='/0';i++)
  s2[i] = s1[i];
 s2[i] = '/0';
}
#endif

 

#if 0
void main()
{
 void copy(char s1[],char s2[]);
 char *a = "I am a teacher .";
 char *b = "You are a student .";
 printf("string a :%s/nstring b :%s/n",a,b);
 printf("copy a to b ./n");
 copy(a,b);
 printf("string a :%s/nstring b :%s/n",a,b);
}
void copy(char s1[],char s2[])
{
 int i = 0;
 for(;s1[i]!='/0';i++)
  s2[i] = s1[i];
 s2[i] = '/0';
}
#endif

#if 0
void main()
{
 void copy(char *s1,char *s2);
 char a[] = "I am a teacher .";
 char b[] = "You are a student .";
 printf("string a :%s/nstring b :%s/n",a,b);
 printf("copy a to b ./n");
 copy(a,b);
 printf("string a :%s/nstring b :%s/n",a,b);
}
void copy(char *s1,char *s2)
{
 for(;*s1!='/0';s1++,s2++)
  *s2 = *s1;
 *s2 = '/0';
}
#endif

#if 0

void main()
{ 
 int n=10;
 int a[10][10];
 int i,j;
 for(i=0;i<n;i++)
 {
  for(j=0;j<=i;j++)
  {
   if(j==0||j==i)
   {
    a[i][j]=1;
   }
   else
    a[i][j]=a[i-1][j-1]+a[i-1][j];
   printf("%d/t",a[i][j]);
  }
  printf("/n");
 }
}

#endif

 

#if 0

void main()
{
 int  a = 1,b = 9;
 char *format = "a = %d,b = %d/n";
 printf(format,a,b);
}

#endif

 

#if 0

void main()
{
 int max(int a,int b);
 int (*p)(int,int);//指向函数的指针
 int a,b,c;
 p = max;//函数的入口地址给指针变量
 scanf("%d%d",&a,&b);
 c = (*p)(a,b);//调用函数
 printf("max = %d/n",c);
}
int max(int a,int b)
{
 return (a>b?a:b);
}

#endif

 

#if 0

void main()
{
 int max(int,int);
 int min(int,int);
 int add(int,int);
 void process(int,int,int (*funtion)(int,int));
 int a,b;
 scanf("%d%d",&a,&b);
 printf("max = ");
 process(a,b,max);
 printf("min = ");
 process(a,b,min);
 printf("sum = ");
 process(a,b,add);
}
int max(int a,int b)
{
 return (a>b?a:b);
}
int min(int a,int b)
{
 return (a<b?a:b);
}
int add(int a,int b)
{
 return (a+b);
}
void process(int a,int b,int (*funtion)(int,int))
{
 int result;
 result = (*funtion)(a,b);
 printf("%d/n",result);
}
#endif