쉽게 풀어쓴 C언어 express 8장 연습문제

1.

#include <stdio.h>

 

int even(int a);

int absolute(int a);

int sign(int a);

 

int main()

{

int a;

printf("정수를입력하시오:");

scanf("%d", &a);

printf("짝수=> 1,홀수=>0:%d\n",even(a));

printf("절대값:%d\n",absolute(a));

printf("음수=>-1,양수=>1 영=>0:%d\n",sign(a));

return 0;

}

int even(int a)

{

if (a % 2 == 0)

return 1;

else

return 0;

}

int absolute(int a)

{

if (a >= 0)

return a

else

return -a

}

int sign(int a)

{

if (a > 0)

return 1;

else if (a == 0)

return 0;

else

return -1;

}

 

 

 

2.

#include <stdio.h>

 

double f_to_c(double f);

int main()

{

double f;

printf("화씨온도를입력하시오:");

scanf("%lf", &f);

printf("섭씨온도는%lf도입니다\n", f_to_c(f));

}

double f_to_c(double f)

{

return(5.0 / 9.0*(f - 32.0));

}

 

 

 

 

 

3.

#include <stdio.h>

#define phi 3.14

double cal_area(double r);

int main()

{

double r;

printf("원의반지름을입력하시오:");

scanf("%lf", &r);

printf("원의면적은%lf입니다\n", cal_area(r));

}

double cal_area(double r)

{

return(phi*r*r);

}

 

 

 

4.

#include <stdio.h>

 

int get_tax(int i);

int main()

{

int i;

printf("소득을입력하시오(만원):");

scanf("%d", &i);

printf("소득세는%d만원입니다\n", get_tax(i));

}

int get_tax(int i)

{

if (i <= 1000)

return(i*0.08);

else

return(i*0.1);

}

 

 

 

5.함수값 출력

#include <stdio.h>

#include <math.h>

#define phi 3.14

 

void main()

{

int i;

double r;

for (i = 0; i <= 180; i = i + 10)

{

r = i*phi / 180;

printf("sin(%d)의값은%lf \n", i, sin(r));

}

}

 

 

 

 

5.입력받아 계산

#include <stdio.h>

#include <math.h>

#define phi 3.141592

double sin_degree(double degree);

 

int main()

{

while (1)

{

int degree;

printf("각도를입력하시오:");

scanf("%d", &degree);

if (degree > 180)

break

printf("sin(%d)의값은%lf\n",degree,sin_degree(degree));

 

}

}

double sin_degree(double degree)

{

return(sin((phi*degree) / 180.0));

}

 

 

 

 

 

6.

#include <stdio.h>

#include <stdlib.h>

#include <time.h>

int b_rand()

{

return(rand() % 2);

}

int main()

{

int i;

srand((unsigned)time(NULL));

for (i = 0; i < 5; i++)

{

printf("%d ", b_rand());

}

printf("\n");

}

 

 

 

 

 

7.

#include <stdio.h>

#include <stdlib.h>

#include <time.h>

int b_rand()

{

return(rand() % 2);

}

int main()

{

int n;

char i;

while (1)

{

printf("앞면또는뒷면(1 또는0):");

scanf("%d", &n);

if (b_rand() == n)

printf("맞았습니다.\n");

else

printf("틀렸습니다.\n");

printf("계속하시겠습니까(y 또는n):");

scanf(" %c", &i);

if (i == 'n')

break

}

}

 

 

 

 

8.

#include <stdio.h>

#include <stdlib.h>

#include <time.h>

double f_rand()

{

return(rand()/(double)RAND_MAX);

}

int main()

{

int i;

for (i = 0; i < 5; i++)

{

printf("%lf ", f_rand());

}

printf("\n");

}

 

 

 

 

9.

#include <stdio.h>

 

int print_value(int n)

{

int i;

for (i = 0; i < n i++)

{

printf("*");

}

printf("\n");

}

 

void main(void)

{

int n;

while (1)

{

printf("값을입력하시오(종료는음수) : ");

scanf("%d", &n);

if (n >= 0)

print_value(n);

else

break

 

}

}

 

 

 

 

10.

#include <stdio.h>

 

int is_multiple(int n, int m)

{

if (n%m == 0)

printf("%d는%d의배수입니다", n, m);

else

printf("%d는%d의배수가아닙니다", n, m);

}

int main()

{

int n, m;

printf("첫번째정수를입력하시오:");

scanf("%d", &n);

printf("두번째정수를입력하시오:");

scanf("%d", &m);

is_multiple(n,m);

printf("\n");

}

 

 

 

11.

#include <stdio.h>

#include <math.h>

 

double get_distance(double x1,double x2, double y1, double y2)

{

return sqrt((x1 - x2)*(x1 - x2) + (y1 - y2)*(y1 - y2));

}

int main()

{

int x1, x2, y1, y2;

printf("첫번째점의좌표를입력하시오:(x,y)");

scanf("%d %d", &x1, &y1);

printf("두번째점의좌표를입력하시오:(x,y)");

scanf(" %d %d", &x2, &y2);

printf("두점사이의거리는%lf입니다.\n", get_distance(x1,x2,y1,y2));

}

 

 

 

 

 

12.

#include <stdio.h>

 

void is_prime()

 

{

int i, j;

for (i = 2; i <= 100; i++)

{

for (j = 2; j < i; j++)

if (i%j == 0) break

if (i == j)

printf("%d ", j);

}

}

int main(void)

{

printf("2부터100사이의소수를출력합니다.\n");

is_prime();

return 0;

}

 

 

 

 

13.

#include <stdio.h>

 

long long factorial(int n)

{

int i;

long long result = 1;

 

for (i = 1; i <= n i++)

{

result *= i;

}

return result;

}

int main(void)

{

int n,i;

double result = 0;

printf("어디까지계산할까요:");

scanf("%d", &n);

for (i = 0; i < n; i++)

{

result=result+(1/(double) factorial(i));

}

printf("오일러의수는%lf입니다.\n",result);

return 0;

}

 

 

 

14.

#include <stdio.h>

 

int is_leap(int n)

{

if (n % 4 == 0 && n % 100 != 0 || n % 400 == 0)

printf("%d는366일입니다.\n", n);

else

printf("%d는365일입니다.\n", n);

}

int main(void)

{

int n;

printf("연도를입력하시오:");

scanf("%d", &n);

is_leap(n);

return 0;

}

 

 

 

 

 

15.

#include <stdio.h>

 

double round(double f)

{

return (int)(f + 0.5);

}

int main()

{

double f;

printf("실수를입력하시오:");

scanf("%lf", &f);

printf("반올림한값은%lf입니다.\n", round(f));

return 0;

}

 

 

 

16.

#include <stdio.h>

#define e 0.000001

 

double f_abs(double x)

{

if (x < 0)

- x;

else

x;

}

double f_min(double x, double y)

{

if (f_abs(x) <= f_abs(y))

return x;

else

return y;

}

int f_equal(double x,double y)

{

double result;

result = (f_abs(x - y)) / f_min(x, y);

if (result < e)

return 1;

else

return 0;

}

void main()

{

double x, y;

printf("실수를입력하시오:");

scanf("%lf", &x);

printf("실수를입력하시오:");

scanf("%lf", &y);

if (f_equal(x, y) == 1)

printf("두개의실수는서로같음\n");

else

printf("두개의실수는서로다름\n");

}

  

 

 

17.

#include <stdio.h>

 

int print_menu()

{

int a;

printf("1.햄버거\n");

printf("2.치즈버거\n");

printf("3.샌드위치\n");

printf("4.종료\n");

printf("원하는메뉴를선택하시오:");

scanf("%d", &a);

check_menu_number(a);

}

int check_menu_number(int a)

{

if (a >= 1 && a <= 3)

printf("%d번째메뉴가선택되었습니다.\n", a);

else if (a == 4)

 

else

print_menu();

}

int main()

{

print_menu();

}

2016/09/24 - [소스코드] - 쉽게 풀어쓴 C언어 express 7장 연습문제

2016/09/24 - [소스코드] - 쉽게 풀어쓴 C언어 express 5장 연습문제

2016/09/24 - [소스코드] - 쉽게 풀어쓴 C언어 express 4장 연습문제