指针作为函数参数（处理数组的四种方式）

//数组名传递给指针子参数
#include <stdio.h>
#define N 3
float average(float * g);
int main()
{
float grade
={60,75,80};
printf("学生的平均成绩是：%.3f\n",average(grade));

}
float average(float * g)
{
float *a=g; //这句话很重要
float ave,sum=0;
for(;g<a+N;g++) //原来a的地方用g代替会出错:因为随g自增,条件恒满足,程序陷入死循环
sum+=*g;
return ave=sum/N;

}

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//数组名传递给数组名
#include <stdio.h>
#define N 3
float average(float grade
);
int main()
{
float grade
={60,75,80};
printf("学生的平均成绩是：%.3f\n",average(grade));

}
float average(float grade
)
{
int i; //
float ave,sum=0;
for(i=0;i<N;i++) //
sum+=grade[i];
return ave=sum/N;

}

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//指针传递给数组名
#include <stdio.h>
#define N 3
float average(float grade
);
int main()
{
float grade
={60,75,80};
float * a=grade;
printf("学生的平均成绩是：%.3f\n",average(a));

}
float average(float grade
)
{
int i; //
float ave,sum=0;
for(i=0;i<N;i++) //
sum+=grade[i];
return ave=sum/N;

}

-------------------------------------------------------------------------------------------------------------------------------------------------------

//指针传递给指针子参数
#include <stdio.h>
#define N 3
float average(float * g);
int main()
{
float grade
={60,75,80};
float * a=grade;
printf("学生的平均成绩是：%.3f\n",average(a));

}
float average(float * g)
{
float *a=g; //
float ave,sum=0;
for(;g<a+N;g++) //
sum+=*g;
return ave=sum/N;

}

//指针传递给指针子参数  

#include <stdio.h>

#define N 3

float average(float * g); 

int main()

{
float grade
={60,75,80};
float * a=grade; 
printf("学生的平均成绩是：%.3f\n",average(a)); 

}

float average(float * g)

{
float *a=g; //这句话很重要 
float ave,sum=0;  
for(;g<a+N;g++) //原来a的地方用g代替会出错:因为随g自增,条件恒满足,程序陷入死循环 
sum+=*g;

return ave=sum/N;

}