要求:
http://codeup.cn/problem.php?cid=100000588&pid=11
说明:
这一题主要注意使用c++判断是否输入结束,使用while(cin>>n)就可以了(判断cin输入是否为真)
代码:
#include <stdio.h>
#include <iostream>
#include <math.h>
#include <string>
using namespace std;
int judge(int i,int p){
if(i %7 == 0){
p = 0;
}
else if(i %10 == 7){
p = 0;
}
else if(i /10 == 7){
p = 0;
}
else{
p = 1;
}
return p;
}
int sum1(int a){
int sum = 0;
int p =1;
for(int i = 1;i <=a;i++){
if(judge(i,p) == 0){
;
}
else{
sum = sum + i*i;
}
}
return sum;
}
int main(){
string n;
while(cin>>n){
int b = n.length();
if(b == 1){
int num = n[0]-'0';
printf("%d\n",sum1(num));
}
else{
int num = (n[0]-'0')*10 + n[1]-'0';
printf("%d\n",sum1(num));
}
}
}