Program berat badam ideal (BM I)

#include
#include
void main()
{int BB,TB1;
float TB2;
float BBI,BMI;
mulai:
printf("\t# HITUNG BERAT BADAN IDEAL #\n");
printf("\t# BODY MASS INDEX CALCULATION #\n\n");
printf("BERAT BADAN(kg) =\n");

scanf("%d",&BB);
printf("TINGGI BADAN(cm)(ex:180) =\n");
scanf("%d",&TB1);
printf("TINGGI BADAN(m)(ex:1.80) =\n");
scanf("%f",&TB2);
printf("========================================\n");
BMI=BB/(TB2*TB2);
BBI=(TB1-100)*90/100;
printf("BERAT IDEAL ANDA = %f\n",BBI);
printf("BODY MASS INDEX ANDA = %f\n",BMI);

if (BMI<18.5>=0)
{printf("KETERANGAN = UNDER WEIGHT\n\n");}
else if (BMI>=18.5 && BMI<25)
{printf("KETERANGAN = NORMAL\n\n");}
else if (BMI>=25 && BMI<30)
{printf("KETERANGAN = OVER WEIGHT\n\n");}
else if (BMI>=30)
{printf("KETERANGAN = OBESITAS\n\n");}
else
{printf("KETERANGAN = ERROR ON INPUT NUMBER\n\n");}

printf("ULANGI PERHITUNGAN ?");
getch();
clrscr();
goto mulai
}