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Massachusetts Institute of Technology Department of Electrical Engineering and Computer Science 6.087: Practical Programming in C IAP 2010 Problem Set 1 Writing, compiling, and debugging programs. Preprocessor macros. C file structure. Variables. Functions and program statements. Returning from functions. Out: Monday, January 11, 2010. Due: Tuesday, January 12, 2010. Problem 1.1 (a) What do curly braces denote in C? Why does it make sense to use curly braces to surround the body of a function? (b) Describe the difference between the literal values 7, "7", and ’7’. (c) Consider the statement double ans = 10.0+2.0/3.0−2.0∗2.0; Rewrite this statement, inserting parentheses to ensure that ans = 11.0 upon evaluation of this statement. Problem 1.2 Consider the statement double ans = 18.0/squared(2+1); For each of the four versions of the function macro squared() below, write the corresponding value of ans. 1. #define squared(x) x*x 2. #define squared(x) (x*x) 3. #define squared(x) (x)*(x) 4. #define squared(x) ((x)*(x)) Problem 1.3 Write the “Hello, 6.087 students” program described in lecture in your favorite text editor and compile and execute it. Turn in a printout or screen shot showing • the command used to compile your program • the command used to execute your program (using gdb) • the output of your program 1 Problem 1.4 The following lines of code, when arranged in the proper sequence, output the simple message “All your base are belong to us.” 1. return 0; 2. const char msg[] = MSG1; 3. } 4. #define MSG1 "All your base are belong to us!" 5. int main(void) { 6. #include 7. puts(msg); Write out the proper arrangement (line numbers are sufficient) of this code. Problem 1.5 For each of the following statements, explain why it is not correct, and fix it. (a) #include ; (b) int function(void arg1) { return arg1-1; } (c) #define MESSAGE = "Happy new year!" puts(MESSAGE); 2 MIT OpenCourseWare http://ocw.mit.edu 6.087 Practical Programming in C January (IAP) 2010 For information about citing these materials or our Terms of Use, visit: http://ocw.mit.edu/terms.
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