分数求和:1-1/3+1/5-1/7+…-1/99+1/101。

#include <stdio.h>

void main() {
    int i, t = 1;
    float n, sum = 0;
    for (i = 1; i <= 101; i += 2) {
        n = (1.0 / i) * t;
        sum += n;
        t = -t;
    }
    printf("%.2f", sum);
}
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