1019
2016-10-24 16:50
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/*************************************************
求2/1+3/2+5/3+8/5+13/8+21/13+...前20项的和
**************************************************/
#include <stdio.h>
int main()
{
double sum=0,a=2,b=1;
int i,j;
for (i=1;i<=20;i++)
{
sum=sum+a/b;
j=a;
a=a+b;
b=j;
}
printf ("%lf\n",sum);
return 0;
}
求2/1+3/2+5/3+8/5+13/8+21/13+...前20项的和
**************************************************/
#include <stdio.h>
int main()
{
double sum=0,a=2,b=1;
int i,j;
for (i=1;i<=20;i++)
{
sum=sum+a/b;
j=a;
a=a+b;
b=j;
}
printf ("%lf\n",sum);
return 0;
}
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