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从m加到n

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public class Main {
	public static void main(String[] args) {
		int sum = 0;
		int m = 20;
		int n = 100;
		// 使用while计算M+...+N:
		while (m <= n) {
                    sum += m;
                    m++;
		}
		System.out.println(sum);
	}
}

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