C语言函数调用的三种实现方法实例

return_type Function_name(Parameter List)
{
    The function body
}

#include<stdio.h>

#define M 10   // 数组元素个数
int num[M]={1,2,3,4,5,6,7,8,9,10};


int sum(int * start, int * end);


int main(void)
{
	long answer;
	answer=sum(num,num+M);
	printf("The　total　number　is　%ld.\n",answer);
	return 0;
}


int sum(int * i, int * end)
{
	int total=0;
	while(i<end)
	{
	total+=*i;// 把数组元素的值加起来
	i++;  // 让指针指向下一个元素
	}
	return total;
}

#include<stdio.h>
#include "D:\mwq\LAB\z7\ARM\VC\extern_get_c_file_v2\sum.c"//调用外部函数   路径+外部函数名

#define M 10   // 数组元素个数
int num[M]={1,2,3,4,5,6,7,8,9,10};



int main(void)
{
	long answer;
	answer=sum(num,num+M);//调用求和函数
	printf("The　total　number is　%d.\n",answer);
	return 0;
}

#include<stdio.h>


int sum(int * i, int * end)
{
	int total=0;
	while(i<end)
	{
	total+=*i;// 把数组元素的值加起来
	i++;  // 让指针指向下一个元素
	}
	return total;
}

#include <stdio.h>
#include "platfORM.h"
#include "xil_printf.h"
#include "sleep.h"
#include "sum.h"

#define M 10
int answer;

int main()
{

    init_platform();

    print("Hello World\n\r");
    print("you are my book\n\r");


	answer=sum(M);//调用求和函数
	printf("The total number is %d.\n",answer);

    cleanup_platform();
    return 0;

}

#include<stdio.h>
#include"sum.h"


int sum(int N)
{
	int i;
	int total=0;
	for(i=0;i<=N;i++)
	{
		total=total+i;// 把数组元素的值加起来
	}
	return total;
}

#ifndef SUM_H
#define SUM_H

int sum(int N);// 子函数

#endif