#include <iostream> using namespace std; enum EOrder { RGB=10, RBG=0021, GRB=0102, GBR=0120, BRG=0201, BGR=0210, ZZZ=0 }; #define RGB_ORDER ZZZ #define RO(X) RGB_BYTE(RGB_ORDER, X) #define RGB_BYTE(RO,X) (((RO)>>(3*(2-(X)))) & 0x3) #define RGB_BYTE0(RO) ((RO>>6) & 0x3) #define RGB_BYTE1(RO) ((RO>>3) & 0x3) #define RGB_BYTE2(RO) ((RO) & 0x3) int main() { cout << "RGB :" << EOrder::RGB<< "\r\n"; cout << "RBG :" << EOrder::RBG<< "\r\n"; cout << "GRB :" << EOrder::GRB<< "\r\n"; cout << "GBR :" << EOrder::GBR<< "\r\n"; cout << "BRG :" << EOrder::BRG<< "\r\n"; cout << "BGR :" << EOrder::BGR<< "\r\n"; cout<< "\r\n"; cout << RO(0); cout<< "\r\n"; cout << RO(1); cout<< "\r\n"; cout << RO(2); cout<< "\r\n"; if (10==EOrder::RGB) cout<<"ok"; return 0; }
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OneCompiler's C++ online compiler supports stdin and users can give inputs to programs using the STDIN textbox under the I/O tab. Following is a sample program which takes name as input and print your name with hello.
#include <iostream>
#include <string>
using namespace std;
int main()
{
string name;
cout << "Enter name:";
getline (cin, name);
cout << "Hello " << name;
return 0;
}
C++ is a widely used middle-level programming language.
When ever you want to perform a set of operations based on a condition If-Else is used.
if(conditional-expression) {
//code
}
else {
//code
}
You can also use if-else for nested Ifs and If-Else-If ladder when multiple conditions are to be performed on a single variable.
Switch is an alternative to If-Else-If ladder.
switch(conditional-expression){
case value1:
// code
break; // optional
case value2:
// code
break; // optional
......
default:
code to be executed when all the above cases are not matched;
}
For loop is used to iterate a set of statements based on a condition.
for(Initialization; Condition; Increment/decrement){
//code
}
While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.
while (condition) {
// code
}
Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.
do {
// code
} while (condition);
Function is a sub-routine which contains set of statements. Usually functions are written when multiple calls are required to same set of statements which increases re-usuability and modularity. Function gets run only when it is called.
return_type function_name(parameters);
function_name (parameters)
return_type function_name(parameters) {
// code
}