small_to_big_alphabets_viceversa.txt

#include<iostream>std;
using namespace std;
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')
str[i] = str[i] - 32;
	else if(str[i] >= 'A' && str[i] <='Z')
str[i] = str[i] + 32;
}
}