In programming, particularly in C++, cout
is used for outputting data to the standard output stream, typically the console. It allows programmers to display messages, variable values, and results of computations to users. cout
is part of the C++ Standard Library and is often used in conjunction with the insertion operator (<<
) to format and control the output. This functionality is essential for debugging, user interaction, and presenting information in a readable format.
Computer Programming is all about algebra. In algebra, you solve for variables like x and y in their simplest form, in programming, the variables can pass on values or accept values and give you the result.For eg:Find the area of a square with side 'a' units.In algebra: Area=a2.In Programming, the program can find the area by taking input from the user.float area,a;couta;area=a*a;cout
A namespace is similar to a class in object oriented programming. A namespace contains functions defined by the programmer. for example namespace std contains functions like cout and cin.namespaces can be globaly declared like so: "using namespace std;"which includes all the functions located in the namespace std.if you only need to use cout you can globaly declare only cout like this "using std::cout;"orstd::cout
the code for the box is: # include <iostream> using namespace std; void main () { cout << "*********\n"; cout << "*\t*\n"; cout << "*\t*\n"; cout << "*\t*\n"; cout << "*\t*\n"; cout << "*\t*\n"; cout << "*\t*\n"; cout << "*\t*\n"; cout << "*********\n"; the code for the oval is: # include <iostream> using namespace std; void main () { cout << " ***\n"; cout <<" * *\n"; cout <<"* *\n"; cout <<"* *\n"; cout <<"* *\n"; cout <<"* *\n"; cout <<"* *\n"; cout <<" * *\n"; cout << " ***\n"; the code for the arrow is: # include <iostream> using namespace std; void main () { cout << " * \n"; cout <<" ***\n"; cout <<"*****\n"; cout <<" * \n"; cout <<" * \n"; cout <<" * \n"; cout <<" * \n"; cout <<" * \n"; the code for the diamond: # include <iostream> using namespace std; void main () { cout << " *\n "; cout <<" * *\n"; cout<<" * *\n"; cout<<" * *\n"; cout<<"* *\n"; cout<<" * *\n"; cout<<" * *\n"; cout <<" * *\n"; cout << " *\n "; }
No, the use of 'namespace std' is not compulsory. You can specifiy it on any object reference. Specifying 'namespace' simply provides a default value. Contrast ... using namespace std; cout << "Hello world!" << endl; ... with ... std::cout << "Hello world!" << std::endl;
you don't need to use ns2 programming
#include<iostream> int main() { std::cout << "Truth table for AND gate\n\n"; std::cout << " |0 1\n"; std::cout << "-+---\n"; for (unsigned a=0; a<2; ++a) { std::cout << a << '|'; for (unsigned b=0; b<2; ++b) { std::cout << (a & b) << ' '; } std::cout << '\n'; } std::cout << std::endl; }
The question is somewhat vague. Could you elaborate?
Computer Programming is all about algebra. In algebra, you solve for variables like x and y in their simplest form, in programming, the variables can pass on values or accept values and give you the result.For eg:Find the area of a square with side 'a' units.In algebra: Area=a2.In Programming, the program can find the area by taking input from the user.float area,a;couta;area=a*a;cout
A namespace is similar to a class in object oriented programming. A namespace contains functions defined by the programmer. for example namespace std contains functions like cout and cin.namespaces can be globaly declared like so: "using namespace std;"which includes all the functions located in the namespace std.if you only need to use cout you can globaly declare only cout like this "using std::cout;"orstd::cout
In c++, to manipulate output & input you must use cin and cout. I will write a sample program to show you:#include //possibly iostream.husing namespace std; //This is what lets you use cin & coutint main(){cout
the code for the box is: # include <iostream> using namespace std; void main () { cout << "*********\n"; cout << "*\t*\n"; cout << "*\t*\n"; cout << "*\t*\n"; cout << "*\t*\n"; cout << "*\t*\n"; cout << "*\t*\n"; cout << "*\t*\n"; cout << "*********\n"; the code for the oval is: # include <iostream> using namespace std; void main () { cout << " ***\n"; cout <<" * *\n"; cout <<"* *\n"; cout <<"* *\n"; cout <<"* *\n"; cout <<"* *\n"; cout <<"* *\n"; cout <<" * *\n"; cout << " ***\n"; the code for the arrow is: # include <iostream> using namespace std; void main () { cout << " * \n"; cout <<" ***\n"; cout <<"*****\n"; cout <<" * \n"; cout <<" * \n"; cout <<" * \n"; cout <<" * \n"; cout <<" * \n"; the code for the diamond: # include <iostream> using namespace std; void main () { cout << " *\n "; cout <<" * *\n"; cout<<" * *\n"; cout<<" * *\n"; cout<<"* *\n"; cout<<" * *\n"; cout<<" * *\n"; cout <<" * *\n"; cout << " *\n "; }
cout<<"______": cin >>__>>__; [example cout<<"enter no."; cin>>a>>b; ]
In the programming language C++, cin is used to input the variable and cout is used to print a certain message or result.
If you mean you cannot use a for loop, then use a while loop: int i=0 while( i++ < 100 ) std::cout << i << " "; std::cout << std::endl; Or a do-while loop: int i=0; do std::cout << ++i << " "; while( i<100 ); std::cout << std::endl; If these are not allowed either, use a procedural loop: int i=0; again: std::cout << ++i << " "; if( i<100 ) goto again; std::cout << std::endl; If even that is not allowed, then the only option is to hard-wire: std::cout << 1 << " " << 2 << " " << [etc] << 99 << " " << 100 << std::endl; It does seem a pointless exercise when a for loop exists specifically for counting iterations like this: for( int i=1; i<=100; ++i ) std::cout << i << " "; std::cout << std::endl;
Cout is actually a statement used for outputting strings, the values of variables, and anyother thing that you want to be displayed on the screen. following is the syntax of cout statement. cout<<"String"; cout<<variable/arrays/structure variables; Note: / means that you can use any one of them. cout<<variable1<<variable2<<variable3; cout<<"string 1"<<varibale1<<"string 2"; note: we can use any combination of variables and strings we want. The << operator takes value from the variable and transfer it to cout which sends it to the output device normally the monitor using a stream called the output stream. Thanx, Ghulam Nasir(Khan) NIIT Cout is actually a statement used for outputting strings, the values of variables, and anyother thing that you want to be displayed on the screen. following is the syntax of cout statement. cout<<"String"; cout<<variable/arrays/structure variables; Note: / means that you can use any one of them. cout<<variable1<<variable2<<variable3; cout<<"string 1"<<varibale1<<"string 2"; note: we can use any combination of variables and strings we want. The << operator takes value from the variable and transfer it to cout which sends it to the output device normally the monitor using a stream called the output stream. Thanx, Ghulam Nasir(Khan) NIIT
No, the use of 'namespace std' is not compulsory. You can specifiy it on any object reference. Specifying 'namespace' simply provides a default value. Contrast ... using namespace std; cout << "Hello world!" << endl; ... with ... std::cout << "Hello world!" << std::endl;
you don't need to use ns2 programming