Cout Was Not Declared In This Scope In Dev C++

P: 1

Here is the code..
#include <iostream>
main()
{
double f_temp, k_temp, c_temp, temp;
char ch, quit;
std::cout << ' *********** Temprature Conversion Calculator **************';
std::cout << 'nn Please enter the temprature unit for which you want the coverison ';
std::cout << 'n 1. F for Fahrenheit to Celcius and Kalvin';
std::cout << 'n 2. C for Celsius to Fahrenheit and Kalvin';
std::cout << 'n 3. K for Kalvin to Fahrenheit and Celcius';
startagain:
std::cout << 'nn Please enter you choice: ';
std::cin >> ch;
switch(ch)
{
case 'f':
case 'F':
std::cout << ' Please enter temprature in Farhenheit: ';
std::cin >> f_temp;
c_temp = (f_temp - 32) * 5/9;
k_temp = (f_temp + 459.67) * 5/9;
std::cout << ' Celcius =' << c_temp;
std::cout << 'n Kelvin =' << k_temp;
std::cout << 'n Do you want to calculate another value (y/n): ';
std::cin >> quit;
if (quit 'y' || quit 'Y')
goto startagain;
break;
case 'c':
case 'C':
std::cout << ' Please enter temprature in Celcius: ';
std::cin >> c_temp;
k_temp = c_temp + 273.15 ;
f_temp = c_temp * 9/5 + 32;
std::cout << ' Kelvin =' << k_temp;
std::cout << 'n Farhenheit =' << f_temp;
std::cout << 'n Do you want to calculate another value (y/n): ';
std::cin >> quit;
if (quit 'y' || quit 'Y')
goto startagain;
break;
case 'k':
case 'K':
std::cout << ' Please enter temprature in Kelvin: ';
std::cin >> k_temp;
c_temp = k_temp - 273.15 ;
f_temp = (k_temp - 273.14) * 9/5 + 32;
std::cout << ' Celcius =' << c_temp;
std::cout << 'n Farhenheit =' << f_temp;
std::cout << 'n Do you want to calcute another value (y/n): ';
std::cin >> quit;
if (quit 'y' || quit 'Y')
goto startagain;
break;
default:
std::cout << 'n Invalid Choice';
}
std::cout << endl<<endl;
system('pause');
}