C ++中前n个自然数之和
在此问题中,要找到前n个自然数之和,我们将找到从1到n的所有数字之和,并将它们加在一起以求和。
让我们举个例子来学习这个概念,
Input : 4Output : 10
Explanation :
Sum of first 1 natural number = 1
Sum of first 2 natural number = 1 + 2 = 3
Sum of first 3 natural number = 1 + 2 +3 = 6
Sum of first 4 natural number = 1 + 2 + 3 + 4 = 10
Sum of sum of 4 natural number = 1 + 3 + 6 + 10 = 20
示例
#include <iostream>using namespace std;
int sumofSum(int n){
int sum = 0;
for (int i=1; i<=n; i++)
sum += i*(i+1)/2;
return sum;
}
int main(){
int n = 4;
cout<<"先加总和 "<<n<<"natural numbers is "<<sumofSum(n);
return 0;
}
输出结果
先加总和 4natural numbers is 20
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