putty 에서의 오류

#include
#include

using namespace std;

int main() {

char select[5];
int minus[5][5];
int plus[5][5];

cout << "operator : " ;
cin >> select;

int (*array)[5] = new int [5][5];

for(int i = 0; i<5; i++) {
for ( int j=0; j<5; j++) {
*(*(array + i) + j) = i + j;
}
}

for ( int i =0; i<5; i++)
{
for ( int j=0; j<5; j++)
{
plus[i][j] = array[i][j] + array[i][j] ;
}
}

for ( int i =0; i<5; i++)
{
for ( int j=0; j<5; j++)
{
minus[i][j] = array[i][j] - array[i][j] ;
}
}

if(strcmp(select, "+") == 0){

cout << "[ " << array[0][0] << " " << array[0][1] << " " << array[0][2] << " "
<< array[0][3] << " " << array[0][4] << " ] "
<< " "
<< "[ " << array[0][0] << " " << array[0][1] << " " << array[0][2] << " "
<< array[0][3] << " " << array[0][4] << " ] " <

cout << "[ " << array[1][0] << " " << array[1][1] << " " << array[1][2] << " "
<< array[1][3] << " " << array[1][4] << " ] "
<< " "
<< "[ " << array[1][0] << " " << array[1][1] << " " << array[1][2] << " "
<< array[1][3] << " " << array[1][4] << " ] " <

cout << "[ " << array[2][0] << " " << array[2][1] << " " << array[2][2] << " "
<< array[2][3] << " " << array[2][4] << " ] "
<< "+"
<< "[ " << array[2][0] << " " << array[2][1] << " " << array[2][2] << " "
<< array[2][3] << " " << array[2][4] << " ] " <

cout << "[ " << array[3][0] << " " << array[3][1] << " " << array[3][2] << " "
<< array[3][3] << " " << array[3][4] << " ] "
<< " "
<< "[ " << array[3][0] << " " << array[3][1] << " " << array[3][2] << " "
<< array[3][3] << " " << array[3][4] << " ] " <

cout << "[ " << array[4][0] << " " << array[4][1] << " " << array[4][2] << " "
<< array[4][3] << " " << array[4][4] << " ] "
<< " "
<< "[ " << array[4][0] << " " << array[4][1] << " " << array[4][2] << " "
<< array[4][3] << " " << array[4][4] << " ] " <

cout << "Result " << endl;
for ( int i =0; i<5; i++)
{cout << " [ " ;
for ( int j=0; j<5; j++)
{
cout << plus[i][j] << " " ;
}
cout << " ] " < }

}

if(strcmp(select, "-") == 0){

cout << "[ " << array[0][0] << " " << array[0][1] << " " << array[0][2] << " "
<< array[0][3] << " " << array[0][4] << " ] "
<< " "
<< "[ " << array[0][0] << " " << array[0][1] << " " << array[0][2] << " "
<< array[0][3] << " " << array[0][4] << " ] " <

cout << "[ " << array[1][0] << " " << array[1][1] << " " << array[1][2] << " "
<< array[1][3] << " " << array[1][4] << " ] "
<< " "
<< "[ " << array[1][0] << " " << array[1][1] << " " << array[1][2] << " "
<< array[1][3] << " " << array[1][4] << " ] " <

cout << "[ " << array[2][0] << " " << array[2][1] << " " << array[2][2] << " "
<< array[2][3] << " " << array[2][4] << " ] "
<< "-"
<< "[ " << array[2][0] << " " << array[2][1] << " " << array[2][2] << " "
<< array[2][3] << " " << array[2][4] << " ] " <

cout << "[ " << array[3][0] << " " << array[3][1] << " " << array[3][2] << " "
<< array[3][3] << " " << array[3][4] << " ] "
<< " "
<< "[ " << array[3][0] << " " << array[3][1] << " " << array[3][2] << " "
<< array[3][3] << " " << array[3][4] << " ] " <

cout << "[ " << array[4][0] << " " << array[4][1] << " " << array[4][2] << " "
<< array[4][3] << " " << array[4][4] << " ] "
<< " "
<< "[ " << array[4][0] << " " << array[4][1] << " " << array[4][2] << " "
<< array[4][3] << " " << array[4][4] << " ] " <

cout << "Result " << endl;
for ( int i =0; i<5; i++)
{cout << " [ " ;
for ( int j=0; j<5; j++)
{
cout << minus[i][j] << " " ;
}
cout << " ] " < }

}

delete []array
array = NULL;

return 0;
}

visual studio 에서는 컴파일 에러가 안뜹니다

하지만 putty에서

In function ‘int main()’:
homework07.cpp:44:22: error: ‘strcmp’ was not declared in this scope
if(strcmp(select, "+") == 0){
^
homework07.cpp:101:22: error: ‘strcmp’ was not declared in this scope
if(strcmp(select, "-") == 0){

라고 나옵니다.
어떻게 해야 하나요??