Ignore case differences when comparing strings.

Ignore case differences when comparing strings.
#include <iostream>
#include <cctype>
using namespace std;
int strcmp_ign_case(const char *str1, const char *str2);
void showresult(const char *str1, const char *str2, int result);
int main() {
char strA[]= "tesT";
char strB[] = "Test";
char strC[] = "testing";
char strD[] = "Tea";
int result;
cout << "Here are the strings: " << endl;
cout << "strA: " << strA << endl;
cout << "strB: " << strB << endl;
cout << "strC: " << strC << endl;
cout << "strD: " << strD << "\n\n";

// Compare strings ignoring case.
result = strcmp_ign_case(strA, strB);
showresult(strA, strB, result);
result = strcmp_ign_case(strA, strC);
showresult(strA, strC, result);
result = strcmp_ign_case(strA, strD);
showresult(strA, strD, result);
result = strcmp_ign_case(strD, strA);
showresult(strD, strA, result);
return 0;
}
// A simple string comparison function that ignores case differences.
int strcmp_ign_case(const char *str1, const char *str2) {
while(*str1 && *str2) {
if(tolower(*str1) != tolower(*str2))
break;
++str1;
++str2;
}
return tolower(*str1) - tolower(*str2);
}
void showresult(const char *str1, const char *str2, int result) {
cout << str1 << " is ";
if(!result)
cout << "equal to ";
else if(result < 0)
cout << "less than ";
else
cout << "greater than ";
cout << str2 << endl;