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float value;
float rear = value - (int)value; //获取浮点数的小数部分

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double round(double number, unsigned int bits) {
    stringstream ss;
    ss << fixed << setprecision(bits) << number;
    ss >> number;
    return number;
}

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int size = 50;
int *p=new int[size];  //申请动态数组

delete [] p; //释放动态数组