Unsafe use of type 'bool' in operation

salut , voila mon programme
# include<stdio.h>
# include<iostream>
using namespace std;

int main()
{
int mat[5][7];
for (int i=1;i<5;i++)
{
for( unsigned int j=1;j<7;j++)
{
if( mat[i][j]=4)
{ if (1<j<2)
//dans cette ligne le progamme m'affiche ce message unsafe u se of bool in opération
cout<<"le numèro ","1"," se trouve dans la %d",j,"rang"
}}}
return 0 ;
}// dans celle ligne fatal error C1075: end of file found before the left brace was matched
1>
1>Build FAILED.
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.merci