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Returns nonzero if ch is a control character or zero is returned

//Declaration: int iscntrl(int ch); //Return: returns nonzero if ch is a control character or zero is returned. #include <ctype.h> #include <stdio.h> int main(void) { char ch; for(;;) { ch = getchar( ); if(ch == '.') { break; } if(iscntrl(ch)){ printf("%c is a control char\n", ch); } } return 0; }