（完整word版）CPrimerPlus第6版编程练习答案（已下载）

C Primer Plus Sixth Edition Programming Exercise

Selected Answers

/* this implementation assumes the character codes */ /* are sequential, as they are in ASCII. */ #include int main( void ) { char let = 'F'; char start; char end;

for (end = let; end >= 'A'; end--) {

for (start = let; start >= end; start--) printf(\ } return 0; }

PE 6---6

/* pe6-6.c */ #include int main( void )

{ int lower, upper,

index; int square, cube;

printf(\scanf(\ending integer: \&upper);

printf(\\index++)

{ square = index * index; cube = index * square;

printf(\ } return 0; }

PE 6---8

/* pe6-8.c */ #include int main( void ) { double n, m; double res;

printf(\

while (scanf(\ {

res = (n - m) / (n * m);

printf(\printf(\ }

return 0; }

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C Primer Plus Sixth Edition Programming Exercise

Selected Answers

PE 6---11

/* pe6-11.c */ #include #define SIZE 8 int main( void ) { int

vals[SIZE]; int i;

printf(\for (i = 0; i < SIZE; i++) scanf(\&vals[i]);

printf(\for (i = SIZE - 1; i >= 0; i--) printf(\printf(\}

PE 6---13

/* pe6-13.c */

/* This version starts with the 0 power */ #include #define SIZE 8 int main( void ) {

int twopows[SIZE]; int i;

int value = 1; /* 2 to the 0 */

for (i = 0; i < SIZE; i++) { twopows[i] = value; value *= 2; } i = 0; do {

printf(\i++; } while (i < SIZE);

printf(\return 0; }

PE 6---14

/* pe-14.c */

/* Programming Exercise 6-14 */ #include #define SIZE 8 int main(void)

{ double arr[SIZE]; double arr_cumul[SIZE]; int i;

printf(\SIZE);

for (i = 0; i < SIZE; i++) {

printf(\scanf(\scanf(\

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C Primer Plus Sixth Edition Programming Exercise

Selected Answers

}

arr_cumul[0] = arr[0]; /* set first element */ for (i = 1; i < SIZE; i++)

arr_cumul[i] = arr_cumul[i-1] + arr[i]; for (i = 0; i < SIZE; i++) printf(\

printf(\SIZE; i++) printf(\

arr_cumul[i]); printf(\return 0; }

PE 6---16

/* pe6-16.c */

#include

#define RATE_SIMP 0.10 #define RATE_COMP 0.05

#define INIT_AMT 100.0 int main( void ) {

double daphne = INIT_AMT; double deidre = INIT_AMT; int years = 0;

while (deidre <= daphne)

{ daphne += RATE_SIMP *

INIT_AMT; deidre += RATE_COMP * deidre;

++years; }

printf(\printf(\$%.2f\\n\}

Chapter 7 Programming Exercises

PE 7---1

/* Programming Exercise 7-1 */ #include int main(void)

{ char ch; int sp_ct = 0; int nl_ct = 0;

int other = 0; while ((ch =

getchar()) != '#') {

if (ch == ' ') sp_ct++; else if (ch == '\\n')

nl_ct++; else other++; }

printf(\

8

C Primer Plus Sixth Edition Programming Exercise

Selected Answers

return 0; }

PE 7---3

/* Programming Exercise 7-3 */ #include int main(void)

{ int n; double sumeven = 0.0; int ct_even = 0; double sumodd = 0.0; int ct_odd = 0;

while (scanf(\ {

if (n % 2 == 0) {

sumeven += n; ++ct_even; }

else // n % 2 is either 1 or -1 {

sumodd += n; ++ct_odd; } }

printf(\if (ct_even > 0)

printf(\putchar('\\n');

printf(\if (ct_odd > 0)

printf(\putchar('\\n'); printf(\ return 0; }

PE 7---5

/* Programming Exercise 7-5 */ #include int main(void)

{ char ch; int ct1 = 0; int ct2 = 0; while ((ch = getchar()) != '#') {

switch(ch) {

case '.' : putchar('!'); ++ct1; break; case '!' : putchar('!'); putchar('!');

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C Primer Plus Sixth Edition Programming Exercise

Selected Answers

++ct2; break; default : putchar(ch); } }

printf(\printf(\ return 0; }

PE 7---7

// Programming Exercise 7-7 #include

#define BASEPAY 10 // $10 per hour

#define BASEHRS 40 // hours at basepay #define OVERTIME 1.5 // 1.5 time

#define AMT1 300 // 1st rate tier #define AMT2 150 // 2st rate tier

#define RATE1 0.15 // rate for 1st tier #define RATE2 0.20 // rate for 2nd tier

#define RATE3 0.25 // rate for 3rd tier int main(void) {

double hours; double gross;

double net; double taxes;

printf(\scanf(\gross = hours * BASEPAY; else

gross = BASEHRS * BASEPAY + (hours - BASEHRS) * BASEPAY * OVERTIME; if (gross <= AMT1) taxes = gross * RATE1; else if (gross <= AMT1 + AMT2)

taxes = AMT1 * RATE1 + (gross - AMT1) * RATE2; else

taxes = AMT1 * RATE1 + AMT2 * RATE2 + (gross - AMT1 - AMT2) * RATE3; net = gross - taxes;

printf(\ return 0; }

PE 7---9

/* Programming Exercise 7-9 */ #include

#include int main(void) {

int limit; int num; int div;

bool numIsPrime; // use int if stdbool.h not available

printf(\while (scanf(\ {

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