C语言数组作为传入参数

上例子

常见的三种数组作为传入参数

#include<stdio.h>float average1(float a[5])
{int i;float sum=0;for(i=0;i<5;i++){sum+=a[i];}printf("1:%d %f
",sizeof(a),sum);
}float average2(float a[])
{int i;float sum=0;for(i=0;i<5;i++){sum+=a[i];}printf("2:%d %f
",sizeof(a),sum);
}float average3(float* a)
{int i;float sum=0;for(i=0;i<5;i++){sum+=a[i];}printf("3:%d %f
",sizeof(a),sum);
}int main(void)
{float s[5] ={1.0,2.0,3.0,4.0,5.0};average1(s);average2(s);average3(s);return 0;
}
/*
1:4 15.000000
2:4 15.000000
3:4 15.000000sizeof(a)都是4;传入参数都视为指针
*/