c编程错误:预期的specifier-qualifier-list在“{”之前

#include <stdio.h>
#include <stdlib.h>       
#include <math.h> 

typedef struct tagPoint

{     
double x, y; 
} point, *pPoint;  

typedef struct tagSource 
{     
point location;     
float power; 
} source, *pSource;

typedef struct

{


{
    struct tagSource tagSource[100],random [2];
        struct tagPoint};

double spl(double w, double r);
double spl_total(struct tagSource *srcs, int count, struct tagPoint dest);
double distance(struct tagPoint p1, struct tagPoint p2);
double power(double w);
int sort(struct tagSource *srcs, int count);
int display(struct tagSource *srcs, int count);


int main (int argc, char *argv[])
{
#include <stdio.h>
#include <stdlib.h>       
#