Example

class ClassA {
public: void methodA () {
string s="XYZ";
int l=s.size();

for ( int i=0; i < l;increment(i)) {

}
};


Solution
Avoid calling function in the iteration part of loop

class ClassA {
public: void methodA () {
string s="XYZ";
int l=s.size();

for ( int i=0; i < l; i++) {

}
};