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C_Primer_Plus(第五版)课后习题答案

Primer

Plus

课后习题

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C_Primer_Plus(第五版)课后习题答案

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Chapter 2

PE 2-1

/* Programming Exercise 2-1 */

#include <stdio.h>

int main(void)

{

printf("Anton Bruckner");

printf("AntonBruckner");

printf("Anton ");

printf("Bruckner");

return 0;

}

PE 2-3

/* Programming Exercise 2-3 */

#include <stdio.h>

int main(void)

{

int ageyears; /* age in years */

int agedays; /* age in days */

/* large ages may require the long type */

ageyears = 44;

agedays = 365 * ageyears;

printf("An age of %d years is %d days.", ageyears, agedays);

return 0;

}

PE 2-4

/* Programming Exercise 2-4 */

#include <stdio.h>

void jolly(void);

void deny(void);

int main(void)

{

jolly();

deny();

return 0;

}

void jolly(void)

{

printf("For he's a jolly good fellow!\n");

}

void deny(void)

{

printf("Which nobody can deny!\n");

}

PE 2-5

/* Programming Exercise 2-5 */

#include <stdio.h>

int main(void)

{

int toes;

toes = 10;

printf("toes = %d\n", toes);

printf("Twice toes = %d\n", 2 * toes);

printf("toes squared = %d\n", toes * toes);

return 0;

}

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

PE 2-7

/* Programming Exercise 2-7 */

#include <stdio.h>

void one_three(void);

void two(void);

int main(void)

{

printf("starting now:\n");

one_three();

printf("done!\n");

return 0;

}

void one_three(void)

{

printf("one\n");

two();

printf("three\n");

}

void two(void)

{

printf("two\n");

}

Chapter 3

PE 3-2

/* Programming Exercise 3-2 */

#include <stdio.h>

int main(void)

{

int ascii;

printf("Enter an ASCII code: ");

scanf("%d", &ascii);

printf("%d is the ASCII code for %c.\n", ascii, ascii);

return 0;

}

PE 3-4

/* Programming Exercise 3-4 */

#include <stdio.h>

int main(void)

{

float num;

printf("Enter a floating-point value: ");

scanf("%f", &num);

printf("fixed-point notation: %f\n", num);

printf("exponential notation: %e\n", num);

return 0;

}

PE 3-6

/* Programming Exercise 3-6 */

#include <stdio.h>

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("Enter the number of quarts of water: ");

scanf("%f", &quarts);

molecules = quarts * mass_qt / mass_mol;

printf("%f quarts of water contain %e molecules.\n", quarts,

molecules);

return 0;

}

Chapter 4

PE 4-1

/* Programming Exercise 4-1 */

#include <stdio.h>

int main(void)

{

char fname[40];

char lname[40];

printf("Enter your first name: ");

scanf("%s", fname);

printf("Enter your last name: ");

scanf("%s", lname);

printf("%s, %s\n", lname, fname);

return 0;

}

PE 4-4

/* Programming Exercise 4-4 */

#include <stdio.h>

int main(void)

{

float height;

char name[40];

printf("Enter your height in inches: ");

scanf("%f", &height);

printf("Enter your name: ");

scanf("%s", name);

printf("%s, you are %.3f feet tall\n", name, height / 12.0);

return 0;

}

PE 4-6

/* Programming Exercise 4-6 */

#include <stdio.h>

#include <float.h>

int main(void)

{

float ot_f = 1.0 / 3.0;

double ot_d = 1.0 / 3.0;

printf(" float values: ");

printf("%.4f %.12f %.16f\n", ot_f, ot_f, ot_f);

printf("double values: ");

printf("%.4f %.12f %.16f\n", ot_d, ot_d, ot_d);

printf("FLT_DIG: %d\n", FLT_DIG);

printf("DBL_DIG: %d\n", DBL_DIG);

return 0;

}

Chapter 5

PE 5-1

/* Programming Exercise 5-1 */

#include <stdio.h>

int main(void)

{

const int minperhour = 60;

int minutes, hours, mins;

printf("Enter the number of minutes to convert: ");

scanf("%d", &minutes);

while (minutes > 0 )

{

hours = minutes / minperhour;

mins = minutes % minperhour;

printf("%d minutes = %d hours, %d minutes\n", minutes, hours, mins);

printf("Enter next minutes value (0 to quit): ");

scanf("%d", &minutes);

}

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