Cin Was Not Declared In This Scope Dev C++

Cin Was Not Declared In This Scope Dev C++

2021. 4. 23. 17:16ㆍ카테고리 없음

Std::cin v1 v2; // ^^ Without the second colon, instead of using the scope resolution operator, you are declaring a label called std, followed by an unqualified name cin (which is why the compiler complains about cin not being declared in this scope).
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Cin Was Not Declared In This Scope Dev C Reviews

Aug 07, 2011 I am practicing my C programming just making an. Health Care related program, I cant seem to access. My data that is stored on a.txt file, All I get is that f is not declared in this scope. Nov 15, 2019 Error 'clrcsr' was not declared in this scope Dev C IDE on windows 10 Online Earning Tips & IT Solutions!!! Please guys Feel Free to ask any query ab. A scope is a region of the program and broadly speaking there are three places, where variables can be declared − We will learn what is a function and it's parameter in subsequent chapters. Here let us explain what are local and global variables. Global variables are defined outside of all the.

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');
}

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A scope is a region of the program and broadly speaking there are three places, where variables can be declared −

Inside a function or a block which is called local variables,
In the definition of function parameters which is called formal parameters.
Outside of all functions which is called global variables.

We will learn what is a function and it's parameter in subsequent chapters. Here let us explain what are local and global variables.

Local Variables

Variables that are declared inside a function or block are local variables. They can be used only by statements that are inside that function or block of code. Local variables are not known to functions outside their own. Following is the example using local variables −

Global Variables

Global variables are defined outside of all the functions, usually on top of the program. The global variables will hold their value throughout the life-time of your program.

A global variable can be accessed by any function. That is, a global variable is available for use throughout your entire program after its declaration. Following is the example using global and local variables −

A program can have same name for local and global variables but value of local variable inside a function will take preference. For example −

When the above code is compiled and executed, it produces the following result −

Initializing Local and Global Variables

When a local variable is defined, it is not initialized by the system, you must initialize it yourself. Global variables are initialized automatically by the system when you define them as follows −

Data Type	Initializer
int	0
char	'0'
float	0
double	0
pointer	NULL