#include <iostream>
#include<string>
#include<math.h>
#include<ctype.h>
#include<stdlib.h>
using namespace std;
string str[100];
int n;
bool check(string s) {
int i = 0;
if (s[i] == '-')i++;
for (;s[i] && s[i] != '.';i++) {
if (!isdigit(s[i])) {//判断字符是否为数字字符
return false;
}
}
if (s[i] == '.') {
for (int j = i + 1;s[j];j++) {
if (!isdigit(s[j]) || j - i > 2) {
return false;
}
}
}
double x = fabs(atof(&s[0]));//将字符串转换成浮点数
if (x > 1000) {
return false;
}
return true;
}
void solve() {
int count = 0;
double sum = 0;
for (int i = 0;i < n;i++) {
if (check(str[i])) {
count++;
sum += atof(&str[i][0]);
}
else {
cout << "ERROR: " << str[i] << " is not a legal number" << endl;
}
}
if (count == 0) {
cout << "The average of 0 numbers is Undefined" << endl;
}
else if (count == 1) {
printf("The average of 1 number is %.2lf
", sum);
}
else {
double y = sum / (double)count;
printf("The average of %d numbers is %.2lf
", count, y);
}
}
int main()
{
cin >> n;
for (int i = 0;i < n;i++) {
cin >> str[i];
}
solve();
return 0;
}
参考博客：https://blog.csdn.net/hy971216/article/details/80653566