//
// Created by zhangrongxiang on 2017/10/20 17:25
// File main
//
#include
#include
#include
using namespace std;
using std::setw;
double getAverage(const int arr[], int size);
int * getRandom();
int main() {
int n[10]; // n æ˜¯ä¸€ä¸ªåŒ…å« 10 个整数的数组
// åˆå§‹åŒ–数组元ç´
for (int i = 0; i < 10; i++) {
n[i] = i + 100; // è®¾ç½®å…ƒç´ i 为 i + 100
}
cout << "Element" << setw(13) << "Value" << endl;
// 输出数组ä¸æ¯ä¸ªå…ƒç´ 的值
for (int j = 0; j < 10; j++) {
cout << setw(7) << j << setw(13) << n[j] << endl;
}
int a[3][4] = {
{0, 1, 2, 3}, /* åˆå§‹åŒ–索引å·ä¸º 0 çš„è¡Œ */
{4, 5, 6, 7}, /* åˆå§‹åŒ–索引å·ä¸º 1 çš„è¡Œ */
{8, 9, 10, 11} /* åˆå§‹åŒ–索引å·ä¸º 2 çš„è¡Œ */
};
for (int k = 0; k < 3; ++k) {
for (int i = 0; i < 4; ++i) {
cout << "a[" << k << "][" << "[" << i << "] == " << a[k][i] << endl;
}
}
cout << "---------------------------------------------------" << endl;
// 带有 5 ä¸ªå…ƒç´ çš„æ•´åž‹æ•°ç»„
double balance[5] = {1000.0, 2.0, 3.4, 17.0, 50.0};
double *p;
p = balance;
// 输出数组ä¸æ¯ä¸ªå…ƒç´ 的值
cout << "使用指针的数组值 " << endl;
for (int i = 0; i < 5; i++) {
cout << "*(p + " << i << ") : ";
cout << *(p + i) << endl;
}
cout << "使用 balance 作为地å€çš„数组值 " << endl;
for (int i = 0; i < 5; i++) {
cout << "*(balance + " << i << ") : ";
cout << *(balance + i) << endl;
}
/* 输出数组ä¸æ¯ä¸ªå…ƒç´ 的值 */
/*
printf("使用指针的数组值\n");
for (int i = 0; i < 5; i++) {
printf("*(p + %d) : %f\n", i, *(p + i));
}
printf("使用 balance 作为地å€çš„数组值\n");
for (int i = 0; i < 5; i++) {
printf("*(balance + %d) : %f\n", i, *(balance + i));
}
*/
cout << "getAverage(n,5) : " << getAverage(n, 5) << endl;
int *pInt = getRandom();
for (int l = 0; l < 10; ++l) {
cout << " random is :" << *(pInt + l) << endl;
}
return 0;
}
double getAverage(const int arr[], int size) {
int i, sum = 0;
double avg;
for (i = 0; i < size; ++i) {
sum += arr[i];
}
avg = double(sum) / size;
return avg;
}
// è¦ç”Ÿæˆå’Œè¿”回éšæœºæ•°çš„函数
int * getRandom()
{
static int r[10];
// 设置ç§å
srand( (unsigned)time( nullptr ) );
for (int & i : r)
{
i = rand();
cout << i << endl;
}
return r;
}