Не могу разобраться в чем ошибка

#include <iostream>
#include <fstream>
#include <string>
#include <vector>
using namespace std;
struct zap
{
int num;
char fio[40];
char gr[30];
int bal;
}
mas[5];
 
int file1 (struct zap *mas)
{
int k=0;
FILE *f=NULL;
f=fopen("C:\file1.txt","rt");
if (f==NULL)
{
cout<<"Net faila";
exit(0);
}
for (int i=0;i!=5;++i )
{
fscanf (f,&mas[i].num);
fscanf (f,&mas[i].fio);
fscanf (f,&mas[i].gr);
fscanf (f,&mas[i].bal);
}
fclose(f);
return i;
}
int sortfio (struct zap *s1,int n)
{
struct zap b;
for (int i=0;i!=n;++i)
{
for (int j=0;j!=n-1;++j)
{
if(s1[j].fio>s1[j+1].fio) ;
{
b=t[j];
t[j]=t[j+1];
t[j+1]=b;
}
}
}
return 0;
}
int srbal (struct zap *s2,int n1)
{
int sum=0;
double sr=0;
for (int i=0;i!=n1;++i)
{
sum+=s2[i].bal;
sr=sum/4;
}
}
return 0;
}
int main()
{
int k1=0,h;
cout<<"Menu: \n";
cout<<"1)\n";
cout<<"2)Sort FIO\n";
cout<<"3)Sred bal\n";
cout<<"4)Exit\n";
cout<<"Vvedite nomer: \n";
//cin>>&k1;
scanf(&k1);
cout<<endl;
switch (k1)
{
case 1:
h=file1(mas);
break;
case 2:
sortfio(mas,h);
break;
case 3:
srbal(mas);
break;
case 4:
exit(0);
break;
}
for (int i=0;i!=5; ++i)
cout<<mas[i].num,mas[i].fio,mas[i].gr,mas[i].bal;
return 0;
}