Why does this C program print weird characters in output?

Question

I\'ve the following program:

#include 

int main()
{
        int ch;
        while( ch = getchar() != \'\\n\') {
                printf(\"Read         


        

Answer 1

C (and C++) interpret the while loop as:

while( ch = (getchar() != '\n')) {

So ch gets the value 1 (for true), which is an unprintable character. You should use explicit parenthesis to fix the precedence:

 while( (ch = getchar()) != '\n') {