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求序列之和——递归.cpp

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求序列之和——递归.cpp

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#include<stdio.h>

main()

{

int n;float s=1;float sum(int,float);

scanf("%d",&n);

sum(n,s);

}

float sum(int n,float s)

{

if(n==1)

{

if(s==1)

printf("1\n");

else

printf("%.6f\n",s);

}

else if(n%2==0)

{

s+=1.0/n;

return sum(n-1,s);

}

else

{

s-=1.0/n;

return sum(n-1,s);

}

}