Question

The program reads characters from input using a while loop. Write an expression that executes the while loop until character 'e' is read. Ex: If input is d F Y x e, then the output is: Character is d Character is F Character is Y Character is x Loop terminated 1 #include 2 using namespace std; 3 4 int main() { 5 char input; 6 7 cin >> input; 8 9 while (//code) 10 11 12 13 14 15 16 ܣ ܗ cout << "Character is " << input << endl; cin >> input; cout << "Loop terminated" << endl; return 0:

Answer 1

Without the ability to read input, it might be difficult to prevent a program from performing the same same action each time it is run, which can grow monotonous after a while.

To read input, the simplest method is to invoke the function getchar. Getchar reads one character from "standard input," which is typically the user's keyboard but which the operating system may occasionally divert. Getchar returns the character it reads or the special value EOF ("end of file") if there are no more characters to read.

Putchar is a companion function that outputs one character to the "standard output."

#include <stdio.h>

/* copy input to output */

main()

{

int c;

c = getchar();

while(c != EOF)

 {

 putchar(c);

 c = getchar();

 }

return 0;

}

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