c++ forbids comparison between pointer and integer - c++

Question

i have a problem on this code
the errors says ISO c++ forbids comparison between pointer and integer
here is the exercise problem
-the answers to a true false test are as follows TTFFT given a two dimensional answer array in which each row corresponds to the answers provided on one test, write a function that accepts the two dimensional array and the number of tests as parameters and returns a one dimensional array containing the grades for each test.(each question is worth 5 points so that the maxinum possible grade is 25)
any answers will help.
this is the code
#include <iostream>
using namespace std;
int numberofgrades(char [][5], int []);
int main()
{
char testanswers[5][5] = {0};
int testgrades[5] = {0};
int counting1, counting2, counting3;
counting1 = 1;
counting2 = 1;
counting3 = 1;
cout << "this program will record the testgrades you entered: "
<< endl;
for(int i = 0; i < 5; i++)
{
for(int k = 0; k < 5; k++)
{
cout << "enter answers for test no. " << counting1 << ": ";
cin >> testanswers[i][k];
}
counting1++;
}
numberofgrades(testanswers,testgrades);
cout << "testing..." << endl;
cout << endl;
for(int o = 0; o < 5; o++)
{
cout << "test no. " << counting2;
for(int l = 0; l < 5; l++)
{
cout << " " << testanswers[o][l];
}
counting2++;
cout << endl;
}
cout << "testing...." << endl;
cout << endl;
cout << "the total number of scores per test no. is: "
<< endl;
for(int t = 0; t < 5; t++)
{
cout << "test no. " << t << ": " << testgrades[t] << endl;
}
return 0;
}
int numberofgrades(char t1a [][5], int tg1[])
{
for(int j = 0; j < 5; j++)
{
for(int i = 0; i < 5; i++)
{
if(t1a[i] == 't') //this is the problem
{
tg1[j] = tg1[j] + 5;
}
else if(t1a[i] == 'T')
{
tg1[j] = tg1[j] + 5;
}
else if(t1a[i] == 'f')
{
tg1[j] = tg1[j] + 0;
}
else if(t1a[i] == 'F')
{
tg1[j] = tg1[j] + 0;
}
else{
cout << "invalid letter exiting the program"
<< endl;
return 0;
}
}
}
return tg1[5];
}