C Primer Plus 第六版第九章编程练习答案
部分习题代码丢失，需要请联系博主。
编译环境：Visual Studio 2017
#includeprintf("%c", ch);
printf("\n");
}
}
//3
void chlist(char ch, int a, int b);
int main(void)
{
int a, b;
char ch;
while ((scanf("%c %d %d", &ch, &a, &b)) == 3)
chlist(ch, a, b);
system("pause");
return 0;
}
void chlist(char ch, int a, int b)
{
int i;
for (;b>0;b--)
{
for (i=0; iprintf("%c", ch);
printf("\n");
}
}
//4
double tiao(double x, double y);
int main(void)
{
double a, b;
while ((scanf("%lf %lf", &a, &b)) == 2)
{
a = tiao(a, b);
printf("tiao=%lf\n", a);
}
system("pause");
return 0;
}
double tiao(double x, double y)
{
double z;
z = 1 / ((1 / x + 1 / y) / 2);
return z;
}
//5
void maxx(double *p_1, double *p_2);
int main(void)
{
double x, y;
while ((scanf("%lf %lf", &x, &y)) == 2)
maxx(&x, &y);
system("pause");
return 0;
}
void maxx(double *p_1, double *p_2)
{
if (*p_1 < *p_2)
*p_1 = *p_2;
else
*p_2 = *p_1;
printf("x=%lf,y=%lf\n", *p_1, *p_2);
}
//6
void paixv(double *p_1, double *p_2, double *p_3);
int main(void)
{
double x, y, z;
while((scanf("%lf %lf %lf",&x,&y,&z))==3)
paixv(&x, &y, &z);
system("pause");
return 0;
}
void paixv(double *p_1, double *p_2, double *p_3)
{
double test;
if (*p_1 > *p_2)
{
test = *p_1;//可以专门写一个用于交换的函数
*p_1 = *p_2;
*p_2 = test;
}
if (*p_1 > *p_3)
{
test = *p_1;
*p_1 = *p_3;
*p_3 = test;
}
if (*p_2 > *p_3)
{
test = *p_2;
*p_2 = *p_3;
*p_3 = test;
}
printf("%lf %lf %lf\n", *p_1, *p_2, *p_3);
}
//7
void duqv(char ch);
int main(void)
{
char ch;
while ((ch = getchar()) != EOF)
duqv(ch);
system("pause");
return 0;
}
void duqv(char ch)
{
int i;
if (isalpha(ch))
i = toupper(ch) - 64;
else
i = -1;
printf("%d ", i);
}
//8
double pow(double x, double y);
int main(void)
{
double x, y;
while ((scanf("%lf %lf", &x, &y)) == 2)
{
if (x == 0 && y == 0)
{
printf("0的0次幂未定义\n");
continue;
}
else x = pow(x, y);
printf("The result is %lf\n", x);
}
system("pause");
return 0;
}
double pow(double x, double y)
{
double r=1;
if (x == 0)
r = 0;
else if (y == 0)
r = 1;
else if(y>0)
{
for (; y > 0; y--)
r = r * x;
}
else
{
for (; y < 0; y++)
r = 1/(r * x);
}
return r;
}
//9
double poww(double x, double y);
int main(void)
{
double x, y;
while ((scanf("%lf %lf", &x, &y)) == 2)
{
if (x == 0 && y == 0)
{
printf("0的0次幂未定义\n");
continue;
}
if (x == 0)
x = 0;
else if (y == 0)
x = 1;
else x = poww(x, y);
printf("the result is %lf\n", x);
}
system("pause");
return 0;
}
double poww(double x, double y)
{
double r=1;
if(y>0)
r = x * poww(x, y - 1);
return r;
//11
int main(void)
{
int i,a[10];
a[0] = 1, a[1] = 1;
printf("%d\n%d\n", a[0],a[1]);
for (i = 2; i < 10; i++)
{
a[i] = a[i - 1] + a[i - 2];
printf("%d\n", a[i]);
}
system("pause");
return 0;
}
//测试
double qiuhe(double x, double y);
double qiuhe2(double x, double y);
int main(void)
{
double x, y, r;
scanf("%lf%lf", &x, &y);
if(y>0)
r=qiuhe(x, y);
if(y<0)
r = qiuhe2(x, y);
printf("%lf", r);
system("pause");
return 0;
}
double qiuhe(double x, double y)
{
int r=1;
if (y > 0)
r = x * qiuhe(x, y - 1);
return r;
}
double qiuhe2(double x, double y)
{
double r = 1;
if (y < 0)
r = x * qiuhe2(x, y + 1);
return (1/r);
}