Given a string, convert the characters of the string into opposite case, i.e. if a character is lower case than convert it into upper case and vice versa.
Examples:

Input : geeksForgEeks
Output : GEEKSfORGeEKS

Input : hello every one
Output : HELLO EVERY ONE
Recommended: Please try your approach on {IDE} first, before moving on to the solution.
ASCII values of alphabets: A – Z = 65 to 90, a – z = 97 to 122
Steps:

Take one string of any length and calculate its length.
Scan string character by character and keep checking the index .
If character in a index is in lower case, then subtract 32 to convert it in upper case, else add 32 to convert it in upper case
Print the final string.

// CPP program to Convert characters  

// of a string to opposite case  

#include<iostream>  

using namespace std;  

// Function to convert characters  

// of a string to opposite case  

void convertOpposite(string &str)  

{  

int ln = str.length();  

// Conversion according to ASCII values  

for (int i=0; i<ln; i++)  

{  

 if (str[i]>='a' && str[i]<='z')  

 //Convert lowercase to uppercase  

 str[i] = str[i] - 32;  

 else if(str[i]>='A' && str[i]<='Z')  

 //Convert uppercase to lowercase  

 str[i] = str[i] + 32;  

}  

}  

// Driver function  

int main()  

{  

string str = "GeEkSfOrGeEkS";  

// Calling the Function  

convertOpposite(str);  

cout << str;  

return 0;  

}  

Explanation:

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