C Primer Plus第6版编程练习答案

Chapter 2 Programming Exercises

PE 2--‐1

/* Programming Exercise 2-1 */ #include <> int main(void)

{ printf(\printf(\printf(\

printf(\0; }

PE 2--‐3

/* Programming Exercise 2-3 */ #include <> int main(void)

{ int ageyears; /* age in years */ int agedays; /* age in days */

/* large ages may require the long type */ ageyears = 101; agedays = 365 * ageyears;

printf(\return 0; }

PE 2--‐4

/* Programming Exercise 2-4 */ #include <> void jolly(void); void deny(void); int main(void)

{ jolly(); jolly(); jolly(); deny(); return 0; }

void jolly(void) {

printf(\}

void deny(void) {

printf(\}

PE 2--‐6

/* Programming Exercise 2-6 */ #include <> int main(void)

{ int toes; toes = 10;

printf(\

printf(\

printf(\0; }

/* or create two more variables, set them to 2 * toes and toes * toes */

PE 2--‐8

/* Programming Exercise 2-8 */ #include <> void

one_three(void); void two(void); int main(void) {

printf(\one_three();

printf(\0; }

void one_three(void) {

printf(\two();

printf(\}

void two(void) {

printf(\}

Chapter 3 Programming Exercises

PE 3--‐2

/* Programming Exercise 3-2 */ #include <> int main(void) {

int ascii;

printf(\scanf(\

printf(\return 0; }

PE 3--‐4

/* Programming Exercise 3-4 */ #include <> int main(void) { float num;

printf(\scanf(\

printf(\printf(\printf(\}

PE 3--‐6

/* Programming Exercise 3-6 */ #include <> int main(void) {

float mass_mol = ; /* mass of water molecule in grams */ float mass_qt = 950; /* mass of quart of water in grams */ float quarts; float molecules;

printf(\scanf(\

molecules = quarts * mass_qt / mass_mol;

printf(\return 0; }

Chapter 4 Programming Exercises

PE 4--‐1

/* Programming Exercise 4-1 */ #include <> int main(void) { char

fname[40]; char lname[40];

printf(\scanf(\your last name: \lname); printf(\fname); return 0; }

PE 4--‐4

/* Programming Exercise 4-4 */ #include <> int main(void)

{ float height; char name[40];

printf(\scanf(\name: \

printf(\ return 0; }

PE 4--‐7

/* Programming Exercise 4-7 */ #include <> #include <> int main(void)

{ float ot_f = / ; double ot_d = / ;

printf(\

printf(\printf(\

printf(\printf(\

printf(\}

Chapter 5 Programming Exercises

PE 5--‐1

/* Programming Exercise 5-1 */ #include <> int main(void)

{ const int minperhour = 60; int minutes, hours, mins;

printf(\scanf(\ { hours = minutes /

minperhour; mins = minutes % minperhour;

printf(\printf(\&minutes); }

printf(\ return 0; }

PE 5--‐3

/* Programming Exercise 5-3 */ #include <> int main(void)

{ const int daysperweek = 7; int days, weeks, day_rem;

printf(\scanf(\ { weeks = days /

daysperweek; day_rem = days % daysperweek;

printf(\days, weeks, day_rem);

printf(\scanf(\ }

printf(\return 0;