The Program in C++ program to change the case (lower to upper and upper to lower cases) of each character of a given string is given below:
#include <iostream>
#include <string>
using namespace std;
int main()
{
string s;
cout << "Hello Codeauri Family, Enter a string here to convert the lowercase to uppercase and vice-versa: ";
getline(cin, s);
for (int i = 0; i < s.length(); i++) {
if (islower(s[i])) {
s[i] = toupper(s[i]);
}
else if (isupper(s[i])) {
s[i] = tolower(s[i]);
}
}
cout << "Well, the Modified string: " << s << endl;
return 0;
}
Output:
Hello Codeauri Family, Enter a string here to convert the lowercase to uppercase and vice-versa: codeauri Simplifies Coding concepts
Well, the Modified string: CODEAURI sIMPLIFIES cODING CONCEPTS
Pro-Tips💡
The for loop iterates over each character in the string:
if (islower(s[i]))checks if the current characters[i]is a lowercase letter.- If the current character is lowercase,
s[i] = toupper(s[i]);changes it to uppercase using thetoupperfunction. - If the current character is not lowercase (i.e., it’s uppercase),
s[i] = tolower(s[i]);changes it to lowercase using thetolowerfunction.
Finally, cout << "Modified string: " << s << endl; displays the modified string to the user, and return 0; ends the program.
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