指针作为函数参数（处理数组的四种方式）

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//数组名传递给指针子参数  #include <stdio.h>#define N 3float average(float * g); int main(){float grade[N]={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 3float average(float grade[N]); int main(){float grade[N]={60,75,80};printf("学生的平均成绩是：%.3f\n",average(grade)); }float average(float grade[N]){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 3float average(float grade[N]); int main(){float grade[N]={60,75,80};float * a=grade; printf("学生的平均成绩是：%.3f\n",average(a)); }float average(float grade[N]){int i; //float ave,sum=0;  for(i=0;i<N;i++) //sum+=grade[i];return ave=sum/N;}

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//指针传递给指针子参数  #include <stdio.h>#define N 3float average(float * g); int main(){float grade[N]={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[N]={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;

}

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