从struct数组中快速交换元素

I have this struct:

我有这个结构体:

typedef struct data{
    char name[100], pseudo[100];
    int num0, num1, num2, num3, num4;
    long int lnum0, lnum1, lnum2, lnum3, lnum4;
    double dnum0, dnum1;
}data;
data list[50]
typedef struct