The C Programming Language习题答案[精品].doc

The C Programming Language, 2nd edition, Kernighan and Ritchie Answer to Exercise 1-1 Run the hello, world program on your system. Experiment with leaving out parts of the program, to see what error messages you get. Murphys Law dictates that there is no single correct answer to the very first exercise in the book. Oh well. Heres a hello world program: #include stdio.h int main(void) { printf(hello, world\n); return 0; } As you can see, Ive added a return statement, because main always returns int, and its good style to show this explicitly. Answer to Exercise 1-2 Experiment to find out what happens when printf s argument string contains \c, where c is some character not listed above. By above, the question is referring to: \n (newline) \t (tab) \b (backspace) \ (double quote) \\ (backslash) We have to tread carefully here, because using a non-specified escape sequence invokes undefined behaviour. The following program attempts to demonstrate all the legal escape sequences, not including the ones already shown (except \n , which I actually need in the program), and not including hexadecimal and octal escape sequences. #include stdio.h int main(void) { printf(Audible or visual alert. \a\n); printf(Form feed. \f\n); printf(This escape, \r, moves the active position to the initial position of the current line.\n); printf(Vertical tab \v is tricky, as its behaviour is unspecified under certain conditions.\n); return 0; } Answer to Exercise 1-3 Modify the temperature conversion program to print a heading above the table. #include stdio.h int main(void) { float fahr, celsius; int lower, upper, step; lower = 0; upper = 300; step = 20; printf(F C\n\n); fahr = lower; while(fahr = upper) { celsius = (5.0 / 9.0) * (fahr - 32.0); printf(%3.0f %6.1f\n, fahr, celsius); fahr = fahr + step; } return 0; } Answer to Exercise 1-4 Write a program to print the corresponding Celsius to Fahrenheit table. #include stdi