Example

int main(int argc, char* argv[])
{
int i;

for(i=0; i<10 ;i++){
for(i ; i<5; i++){
cout << "\ni: " << i;
}
}

return 0;
}

Solution

Use different variables for the control of nested loops.

int main(int argc, char* argv[])
{
int i;
int j;

for(i=0; i<10 ;i++){
for(j=0 ; j<5; j++){
cout << "\ni: " << i;
cout << "\nj: " << j;
}
}

return 0;
}