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37 lines
485 B
C++
37 lines
485 B
C++
/*
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7-3 ???????????????
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?? 10
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?? C???
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?? ????
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????????,??????? 1 - 1/4 + 1/7 - 1/10 + ... ?????????????????eps?
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????:
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?????????????eps?
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????:
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??????“sum = S”??????????S,???????????????????????????
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????1:
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4E-2
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????1:
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sum = 0.854457
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????2:
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0.02
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????2:
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sum = 0.826310
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*/
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#include<stdio.h>
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int main(){
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int flag=1;
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double eps,a=1,sum=0;
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scanf("%lf",&eps);
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for(int i=1;;){
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sum+=1.0/a*flag;
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if(1.0/a<=eps)
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break;
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a+=3;
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flag=-flag;
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}
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printf("sum = %.6lf",sum);
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return 0;
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}
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