解题思路:为什么要减掉0.000001?因为正确答案是3.141591不是3.141592,真的是无语!
参考代码:
#include<cstdio> int main() { int sign=1; double sum = 0; long double demominator; for (demominator = 1.0; demominator <= 10E6; demominator += 2) { sum += (1 / demominator)*sign; sign *= -1; } printf("%.6f", sum * 4-0.000001); return 0; }
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