#include<math.h>#include<stdio.h>main(){ float a,b,c,s=0; double area=0; int flag=1, q;  do  { while(flag) {  printf("input the datas:\n");        scanf("%f%f%f",&a,&b,&c);     if(a+b<=c||a+c<=b||b+c<=a)  {      flag=1;      printf("the datas you input can't conbine a triangle;please input other datas.\n");  }  else   flag=0;  }        s=(a+b+c)/2;  printf("%f\n",s);  area=sqrt(s*(s-a)*(s-b)*(s-c));  printf("%5.3f",area);  printf("continue or not?\n1---yes;\n0---no;\n");     scanf("%d",&q);      if(q==1)    flag=1;     }while(flag);}

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