[英]How do I keep updating a variable's value?
我试图编写一个代码,它会告诉我使用单位时间量(round)和人口(pop)的指数增长,但最终得到的代码是从原始变量计算值。 例如,当我输入 10000 为 pop 和 3 为 round 时,它应该首先计算 10000 的 %5,将其添加到原始值,然后再用新值再计算 2 次。 每次重复 for 循环时,我似乎都找不到更新 pop 的方法。 有人能帮我吗?
#include <iostream>
using namespace std;
int main() {
int pop, new_people;
int i, round;
cout << "Population: ";
cin >> pop;
cout << "Round: ";
cin >> round;
new_people = (pop * 5) / 100;
for (i = 1; i <= round; i++) {
pop += new_people;
cout << pop;
}
return 0;
}
您需要将 new_people 更新放在 for 循环中,以便每轮更新它。
#include<iostream>
using namespace std;
int main() {
int pop, new_people;
int i, round;
cout << "Population: ";
cin >> pop;
cout << "Round: ";
cin >> round;
for(i = 1; i<=round; i++){
new_people = (pop*5)/100;
pop += new_people;
cout << pop;
}
return 0;
}
您可以将“new_people = (pop * 5) / 100”和“pop += new_people”放入循环中,以更新“new_people”和“pop”的值。
#include<iostream>
using namespace std;
int main() {
int pop, new_people;
int i, round;
cout << "Population: ";
cin >> pop;
cout << "Round: ";
cin >> round;
for (i = 1; i <= round; i++) {
new_people = (pop * 5) / 100;
pop += new_people;
cout << "round" << i << ": " << pop << endl;
}
return 0;
}
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