61611.cpp

来自「C Primer Plus(第五版)书后练习 第6章答案(自己做的」· C++ 代码 · 共 31 行

#include<stdio.h>
void main(void)
{
	float sum1=0,sum2=0;
	int times;
	printf("Enter times:\n");
	scanf("%d",&times);
	for(int i=1;i<=times;i++)
	{
		sum1+=1/float(i);
		printf("1/%.1f+",float(i));
	}
	printf("=%f\n",sum1);
	for(i=1;i<=times;i++)
	{
		if(i%2==1)
		{
			sum2+=1/float(i);
			printf("+1/%.1f",float(i));
		}
		else if(i%2==0)
		{
			sum2-=1/float(i);
			printf("-1/%.1f",float(i));
		}
	}
	printf("=%f\n",sum2);
	printf("\nsum1=%f\n",sum1);
	printf("sum2=%f\n",sum2);
}