第一题
#include <stdio.h>
#include<string>
void selection_sort(int n, int a[])
{
int i, j, max = a[0];
for (i = 0; i < n; i++)
{
if (max <= a[i])
{
max = a[i];
j = i;
}
}
a[j] = a[n - 1];
a[n - 1] = max;
n--;
if (n == 0)
return;
else
selection_sort(n, a);
}
int main(void)
{
int n;
printf("How many numbers do you want to resevse? ");
scanf("%d", &n);
int a[99];
printf("Enter the number you want: ");
for (int i = 0; i < n; i++)
scanf("%d", &a[i]);
selection_sort(n, a);
printf("In sorted order: ");
for (int i = 0; i < n; i++)
printf("%d ", a[i]);
system("pause");
return 0;
}
第二题
#include <stdio.h>
#include<string>
float js(float income)
{
float out;
if (income < 750)
out = 750 * 0.01;
else if (income < 2250)
out = (income - 750)*0.02 + 7.50;
else if (income < 3750)
out = (income - 2250)*0.03 + 37.50;
else if (income < 5250)
out = (income - 3750)*0.04 + 52.50;
else if (income < 7000)
out = (income - 7000)*0.05 + 142.50;
else
out = (income - 750)*0.06 + 230.0;
return out;
}
int main(void)
{
float income;
printf("Enter your income:");
scanf_s("%f", &income);
printf("The outmoney is %.2f$", js(income));
system("pause");
return 0;
}
第三题
#include <stdio.h>
#include<string>
float js(float income)
{
float out;
if (income < 750)
out = 750 * 0.01;
else if (income < 2250)
out = (income - 750)*0.02 + 7.50;
else if (income < 3750)
out = (income - 2250)*0.03 + 37.50;
else if (income < 5250)
out = (income - 3750)*0.04 + 52.50;
else if (income < 7000)
out = (income - 7000)*0.05 + 142.50;
else
out = (income - 750)*0.06 + 230.0;
return out;
}
int main(void)
{
float income;
printf("Enter your income:");
scanf_s("%f", &income);
printf("The outmoney is %.2f$", js(income));
system("pause");
return 0;
}
第四题
#include <stdio.h>
#include<string>
#include <time.h>
void generate_random_walk(char walk[10][10])
{
srand((unsigned)time(NULL));
int n = 0, i, j, way, m = 1, h = 0;
for ( i = 0; i < 10; i++)
{
for ( j = 0; j < 10; j++)
{
walk[i][j] = '.';
}
}
walk[0][0] = 'A';
i = 0; j = 0;
for (; m < 26; m++)
{
while (n == 0)
{
way = rand() % 4;
if (((i == 0) || (walk[i - 1][j] != '.')) && (way == 0))//0
way = 1;
else if (((j == 9) || (walk[i][j + 1] != '.')) && (way == 1))//1
way = 2;
else if (((i == 9) || (walk[i + 1][j] != '.')) && (way == 2))//2
way = 3;
else if (((j == 0) || (walk[i][j - 1] != '.')) && (way == 3))//3
way = 0;
else
n = 1;
h++;;
}
if (h > 4)
break;
n = 0;
h = 0;
switch (way)
{
case 0:walk[i - 1][j] = 'A' + m; i -= 1; break;
case 1:walk[i][j + 1] = 'A' + m; j += 1; break;
case 2:walk[i + 1][j] = 'A' + m; i += 1; break;
case 3:walk[i][j - 1] = 'A' + m; j -= 1; break;
default:break;
}
}
}
void printf_array(char walk[10][10])
{
for (int i = 0; i < 10; i++)
{
for (int j = 0; j < 10; j++)
{
printf("%c ", walk[i][j]);
}
printf("\n");
}
}
int main(void)
{
char num[10][10];
generate_random_walk(num);
printf_array(num);
system("pause");
return 0;
}
第五题
#include <stdio.h>
#include<string>
void creat_magic_square(int n, int magic_square[99][99])
{
int i = 0, j, m, ii, jj;
j = n / 2;
magic_square[i][j] = 1;
for (m = 2; m <= (n*n); m++)
{
ii = i;
jj = j;
i = (i + n - 1) % n;
j = (j + n + 1) % n;
if (magic_square[i][j] == 0)
magic_square[i][j] = m;
else
{
i = (ii + n + 1) % n;
j = jj;
magic_square[i][j] = m;
}
}
}
void print_magic_square(int n, int magic_square[99][99])
{
for (int i = 0; i < n; i++)
{
for (int j = 0; j < n; j++)
printf("\t%d", magic_square[i][j]);
printf("\n");
}
}
int main(void)
{
int n, i = 0, j, m, ii, jj, a[99][99] = { 0 };
printf("Enter the siae oh magic square:");
scanf("%d", &n);
creat_magic_square(n, a);
print_magic_square(n, a);
system("pause");
return 0;
}
第六题
#include <stdio.h>
#include<string>
int js(int x)
{
int y;
y = 3 * x*x*x*x*x + 2 * x*x*x*x - 5 * x*x*x - x*x + 7 * x - 6;
return y;
}
int main(void)
{
int x;
printf("Enter x:");
scanf("%d", &x);
printf("The resule is %d\n", js(x));
system("pause");
return 0;
}
第七题
#include <stdio.h>
#include<string>
int power(int x, int n)
{
if (n == 0) {
return 1;
}
else if (n % 2 == 0 && n != 0) {
return power(x, n / 2) * power(x, n / 2);
}
else if (n % 2 != 0) {
return x * power(x, n - 1);
}
}
int main(void)
{
int x, n,a;
printf("Enter x and n:");
scanf("%d %d", &x, &n);
printf("Result:%d\n", power(x, n));
system("pause");
return 0;
}
第八题
#include <stdio.h>
#include<string>
#include<time.h>
int roll_dice(void)
{
int i, j;
srand((unsigned)time(NULL));
i = abs(rand() % 6 + 1);
j = abs(rand() % 6 + 1);
return i + j;
}
int play_game()
{
int i = roll_dice(),ii = 0;
printf("You rolled : %d\n", i);
if (i == 7 || i == 11)
return 1;
else if (i == 2 || i == 3 || i == 12)
return 0;
else
{
printf("You point is: %d\n", i);
do{
ii = roll_dice();
printf("You rolled: %d\n", ii);
if (ii == 7)
return 0;
else if (ii == i)
return 1;
} while (ii != 7 || ii != i);
}
}
int main(void)
{
int r,i = 0, j = 0,k ;
char c;
do {
k = 0;
r = play_game();
if (r == 1)
{
i++;
printf("You win!\n");
}
else
{
j++;
printf("You lose!\n");
}
printf("PLay again?");
c = getchar();
getchar();
if (c == 'y')
k = 0;
else if(c == 'n')
k = 1;
} while (k == 0);
printf("Win: %d Losses: %d\n", i, j);
system("pause");
return 0;
}
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