A1108 Finding Average (20分)

一、技术总结

1. 具体参看代码
2. 参看sscanf和sprintf的解释，https://www.cnblogs.com/tsruixi/p/12933677.html

二、参考代码

#include<bits/stdc++.h>
using namespace std;
int main(){
	int N, cnt = 0;
	double sum = 0.0, temp;
	scanf("%d", &N);
	char a[50], b[50];
	for(int i = 0; i < N; i++){
		scanf("%s", a);
		sscanf(a, "%lf", &temp);
		sprintf(b, "%.2f", temp);
		int flag = 0;
		for(int j = 0; j < strlen(a); j++){
			if(a[j] != b[j]) flag = 1;
		}
		if(flag || temp < -1000 || temp > 1000){
			printf("ERROR: %s is not a legal number
", a);
			continue;
		}else{
			sum += temp;
			cnt++;
		}
	}
	if(cnt == 1){
		printf("The average of 1 number is %.2f", sum);
	}else if(cnt > 1){
		printf("The average of %d numbers is %.2f", cnt, sum / cnt);
	}else{
		printf("The average of 0 numbers is Undefined");
	}
	return 0;
}