初学c++，遇到个问题，帮帮忙啦~

#include<stdio.h>
#include<math.h>
int main(){
double tz[1000];
int sg[1000];
int n,i;
double j,m,k;
scanf("%d\n",&n);
for(i=0;i<n;i++){
char xb[7];
scanf("%s %lf %d\n",&xb,&tz[i],&sg[i]);
j=1.0*sg[i]/100;
m=pow(j,2);
k=1.0*tz[i]/m;
if(xb=="Male\0"){
if(k>=20&&k<25)
printf("Normal\n");
else if(k<20)
printf("Underweight\n");
else if(k>=25&&k<30)
printf("Overweight\n");
else if(k>=30&&k<35)
printf("Obese Class 1\n");
else if(k>=35)
printf("Obese Class 2\n");
}
if(xb=="Female\0"){
if(k>=19&&k<24)
printf("Normal\n");
else if(k<19)
printf("Underweight\n");
else if(k>=24&&k<29)
printf("Overweight\n");
else if(k>=29&&k<34)
printf("Obese Class 1\n");
else if(k>=34)
printf("Obese Class 2\n");
}
}
return 0;
}