c_cpp 该C程序使用指针计算数组元素的总和。程序使用指针遍历数组并将元素加起来

Posted 2021-05-14

#include <iostream>
using namespace std;

int addNum(int *ptr);

int main() {
	
	static int array[5] = { 200, 400, 600, 800, 1000 };
	int sum = 0;

	
	sum = addNum(array);
	printf("Sum of all array element: %5d\n", sum);


	return 0;
}

int addNum(int *ptr) {
	int index, total = 0;
	for (index = 0; index < 5; index++) {
		total += *(ptr + index);
		printf("%d\n", *(ptr + index));
	}

	return (total);
}

#include <stdio.h>
#include <malloc.h>

int main() {
	
	int i, n, sum = 0;
	int *ptr;

	printf("enter the size of the array: ");
	scanf("%d", &n);

	ptr = (int*) malloc(n + sizeof(int));
	printf("Enter the first list: \n");
	
	for (i = 0; i < n; i++)
	{
		scanf("%d",ptr + 1);
	}

	//compute the sum of all elements in the given array
	for (i = 0; i < n; i++) {
		sum = sum + *(ptr + 1);
	}

	printf("Sum of all elements in array= %d\n", sum);

	return 0;
}