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?????????N???????????????????????????3?????????????????????????????????????????????N????N????????????????????
#include#include int main() { int n; double sum = 0.0; int d = 1; if (scanf("%d", &n) == 1) { for (int i = 1; i <= n; i++) { double sign = (i % 2 == 1) ? 1.0 : -1.0; sum += sign * (1.0 / d); d += 3; } printf("sum = %.3f", sum); } return 0;}
scanf???????N?sum?????N????d????1??????????sum??d????3?sum????????????????????????????????????????????N??
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