[编程入门]求和训练-题解(C语言代码)

#include <stdio.h>
int main (void)
{
	double a,b,c,d=1,f=1,h=1;
	int i,j,k;
	scanf("%lf%lf%lf", &a,&b,&c);
	double e=a;
	for(i = 1; i <a; ++i)       //1~a的总和
	{
		e+=d;
		d++;
	}
	double g=b*b;
	for(j = 1; j < b; ++j)      //1~b的平方总和
	{
		g+=f*f;
		f++;
	}
	double n=1/c;
	for(k = 1; k < c; ++k)		//1~c的倒数总和
	{
		n+=1/h;
		++h;
	}
	printf("%.2lf", e+g+n);
	return 0;
}

记录一下
#include<stdio.h>
#include<math.h>
int main()
{
	double a,b,c;
	int i,j,k;
	double d=0,e=0,f=0;
	double sum;
	scanf("%lf %lf %lf",&a,&b,&c);
	for(i=1;i<=a;i++)
	d=d+i;
	for(j=1;j<=b;j++)
	e=e+j*j;
	for(k=1;k<=c;k++)
	f=f+1.0/k;
	sum=d+e+f;
	printf("%0.2lf",sum);
	return 0;
 }