我用的是DEV C++ 但是运行下面这个程序却有错误  错误的内容是    [Error] expected ',' or ';' before '{' token   求解


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

/* run this program using the console pauser or add your own getch, system("pause") or input loop */

int main(int argc, char *argv[])
{
   
    double delta = 3
 {
      if ( delta > 0 )
            printf("有两个解\n");
      else if ( delta == o)
            printf("有一个唯一解\n");
      else ( delta < 0)
            printf("无解\n");

  }   
  return 0;
}