24 lines
496 B
C
24 lines
496 B
C
#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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#include <math.h>
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int main()
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{
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int N;
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printf("请输入项数N: ");
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scanf("%d", &N);
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double a = 2.0, b = 1.0, sum = 0.0;
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for (int i = 0; i < N; i++)
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{
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sum += a / b;
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double next_a = a + b; // 计算下一项的分子
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double next_b = a; // 计算下一项的分母
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a = next_a; // 更新分子
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b = next_b; // 更新分母
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}
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printf("%.2f\n", sum);
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return 0;
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} |