c - 动态内存指针

int main(int argc, char **argv) {
    float *rainfall;
    float rain_today;
    // rainfall has been dynamically allocated space for a floating point number.
    // Both rainfall and rain_today have been initialized in hidden code.
    // Assign the amount in rain_today to the space rainfall points to.

    return 0;
}

嗨，大家好。这是一个非常基本的问题，但是我还没有找到解决方案。
不只是

rain_today = *rainfall

最佳答案

没有。

rain_today = *rainfall;将采用rainfall指向的值并将其放在rain_today中（理想情况下为NULL）。

要求您执行的操作是将rain_today的值放入指针rainfall指向的空间中

这是：

*rainfall = rain_today \\the value of rain_toady is COPIED to the space pointed by rainfall

或者，您可以执行以下操作：

rainfall = &rain_today \\rainfall points at the memory location of rain_today