Reverse case using array indexing. : char array « Data Types « C++ Tutorial

#include <iostream> 
#include <cctype> 
using namespace std; 
int main() 
  int i; 
  char str[80] = "This Is A Test"; 
  cout << "Original string: " << str << "\n"; 
  for(i = 0; str[i]; i++) { 
      str[i] = tolower(str[i]); 
    else if(islower(str[i])) 
      str[i] = toupper(str[i]); 
  cout << "Inverted-case string: " << str; 
  return 0; 
Original string: This Is A Test
Inverted-case string: tHIS iS a tEST

2.20.char array
2.20.1.char array buffers
2.20.2.initialized string
2.20.3.Treating character arrays as strings.
2.20.4.Get line with buffer size for char array reading
2.20.5.Use cin.get() to read a string based on char array
2.20.6.Reverse case using array indexing.
2.20.7.Reverse a string in place.
2.20.8.Copying a string using array notation
2.20.9.Copying a string using pointer notation
2.20.10.Initializing char pointers with strings
2.20.11.Using an array of pointers to char
2.20.12.simple string variable
2.20.13.reads multiple lines, terminates on '$' character
2.20.14.reads string with embedded blanks
2.20.15.Read from keyboard and output char array
2.20.16.multidimensional char arrays