C Primer Plus第6版编程练习问题详解(已下载)

Chapter 2 Programming Exercises

PE 2--‐1

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

{ printf(\printf(\printf(\

printf(\}

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(\}

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(\squared = %d\\n\}

/* 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(\return 0; }

void one_three(void) {

printf(\ printf(\}

void two(void) {

printf(\}

Chapter 3

Programming Exercises

PE 3--‐2

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

int ascii;

printf(\&ascii);

printf(\}

PE 3--‐4

/* Programming Exercise 3-4 */ #include int main(void)

{ float num;

printf(\ printf(\printf(\printf(\

}

PE 3--‐6

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

float mass_mol = 3.0e-23; /* mass of water molecule in grams */ float mass_qt = 950; /* mass of quart of water in grams */ float quarts; float molecules;

printf(\&quarts);

molecules = quarts * mass_qt / mass_mol;

printf(\}

Chapter 4

Programming Exercises

PE 4--‐1

/* Programming Exercise 4-1 */ #include int main(void)

{ char fname[40]; char lname[40];

printf(\scanf(\last name: \printf(\0; }

PE 4--‐4

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

{ float height; char name[40];

printf(\scanf(\\

printf(\ return 0; }

PE 4--‐7

/* Programming Exercise 4-7 */ #include

#include int main(void)

{ float ot_f = 1.0 / 3.0; double ot_d = 1.0 / 3.0; printf(\

printf(\\

printf(\

printf(\DBL_DIG); return 0; }

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(\ }

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(\&days); }

printf(\0; }

PE 5--‐5

/* Programming Exercise 5-5 */ #include

int main(void) /* finds sum of first n integers */ {

int count, sum; int n;

printf(\

scanf(\sum = 0; while (count++ < n) sum = sum + count; printf(\= %d\\n\}

PE 5--‐7

/* Programming Exercise 5-7 */ #include void showCube(double x);

int main(void) /* finds cube of entered number */ { double val;

printf(\scanf(\return 0; }

void showCube(double x) {

printf(\}

Chapter 6

Programming Exercises

PE 6--‐1

/* pe6-1.c */

/* this implementation assumes the character codes */ /* are sequential, as they are in ASCII. */