最佳答案

【1】C1_xxx.c

#include

int sum(int a, int b);

int mul(int a, int b);

int main(void) {

int a, b;

printf("a: ");

scanf("%d", &a);

getchar();

printf("b: ");

scanf("%d", &b);

printf("%d + %d = %d\n", a, b, sum(a, b));

printf("%d * %d = %d\n", a, b, mul(a, b));

return 0;

}

int sum(int a, int b) {

return a+b;

}

int mul(int a, int b) {

return a*b;

}

【2】C2_xxx.c

#include

void judge_vision(float es);

int main(void) {

float eyesight;

while(1) {

printf("Your eye-sight( 4.0<= es <=5.3 ): ");

scanf("%f", &eyesight);

judge_vision(eyesight);

}

return 0;

}

void judge_vision(float es) {

if (es > 5.3 || es < 4.0)

fprintf(stderr, "Error: %g is less than 4.0 or greater than 5.3\n", es);

else if (es < 5.0)

puts("You are shortsighted.");

else

puts("You are healthy.");

putchar('\n');

}

【4】C4_xxx.c

#include

#include

#define YES (1)

#define NO (0)

#define MAX (20)

char* get_pw(char* pw_buf, int max);

int check_pw(char* usr_pw, int pw);

int main(void) {

int inputed_times = 0;

int pw = 111;

char usr_pw[MAX];

char tel_no[MAX];

int result;

printf("Tel No. : ");

scanf("%s", tel_no);

do {

get_pw(usr_pw, MAX);

++inputed_times;

result = check_pw(usr_pw, pw);

if (NO == result) {

fprintf(stderr, "Error: Password invalid. %d times remained.\n\n", 4-inputed_times);

}

} while (inputed_times < 4 && NO == result);

if (4 == inputed_times)

fputs("Error: Too much invalid Password. Quit.", stderr);

else

puts("Recharge successfully.");

return 0;

}

char* get_pw(char* pw_buf, int max) {

int i;

char ch;

printf("Password: ");

for (i=0; i

ch = getch();

putchar(ch);

if (ch != '#')

pw_buf[i] = ch;

else

break;

}

pw_buf[i] = '\0';

putchar('\n');

return pw_buf;

}

int check_pw(char* usr_pw, int pw) {

int ret = NO;

int i;

int sum = 0;

for(i=0; usr_pw[i]; ++i) {

if (usr_pw[i] < '0' || usr_pw[i] > '9')

break;

sum *= 10;

sum += (usr_pw[i] - '0');

}

if (sum == pw)

ret = YES;

return ret;

}

【5】C5_xxx.c

#include

int main(void) {

int array[6] = {2, 3, -1, 0, 5, 8};

int i;

int sum = 0;

for (i=0; i < 6; ++i) {

sum += array[i];

}

printf("Sum = %d\n", sum);

return 0;

}

【6】C6_xxx.c

#include

#define DAYS (7)

int main(void) {

double array[DAYS];

int i;

double sum = 0;

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

printf("Sleep time of Day %d: ", i+1);

scanf("%lf", &array[i]);

sum += array[i];

}

printf("The average sleep time is %.2lf\n", sum/DAYS);

return 0;

}

【7】C7_xxx.c

#include

#define Ss (10)

double* get_scores(double array[], int len);

double average(double array[], int len);

int main(void) {

double scores[Ss];

double aver;

get_scores(scores, Ss);

aver = average(scores, Ss);

printf("The average score is %.2lf.\n", aver);

return 0;

}

double* get_scores(double array[], int len) {

int i;

for (i=0; i

printf("Score of #%d student: ", i+1);

scanf("%lf", &array[i]);

}

return array;

}

double average(double array[], int len) {

double ret;

double sum = 0;

int i;

for (i=0; i

sum += array[i];

}

ret = (sum/len);

return ret;

}

【3】C3_xxx.c

#include

int main(void) {

int Raps = 0;

int Pops = 0;

int Vocals = 0;

int i;

char type;

for (i=1; 1; ++i) {

printf("Enrollment ID #%d\n", i);

printf("\tType of show(R for Rap, P for Pop, V for Vocal, Q for Quit): ");

type = getchar();

getchar();

if ('R' == type || 'r' == type) {

++Raps;

printf("\tEnrollment ID #%d is appended to Rap show.\n\n", i);

}

else if ('P' == type || 'p' == type) {

++Pops;

printf("\tEnrollment ID #%d is appended to Pop play.\n\n", i);

}

else if ('V' == type || 'v' == type) {

++Vocals;

printf("\tEnrollment ID #%d is appended to Vocal match.\n\n", i);

}

else if ('Q' == type || 'q' == type)

break;

else

fputs("\tError: Type Error, try again.\n", stderr);

}

printf("There are %d Raps, %d Pops, %d Vocals.\n", Raps, Pops, Vocals);

return 0;

}

追答：

C3_xxx.c中关于错误节目类型被录入的代码判断有错误，也就是说错误的节目不应当修改用于记录节目ID的变量(int i)，现将判断块中最后一段else代码贴出： else { fputs("\tError: Type Error, try again.\n", stderr); --i; }

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