练习8-1
#include
#define diff(x,y)(x-y)
int main() {
int x;
int y;
printf("x=");
scanf("%d", &x);
printf("y=");
scanf("%d", &y);
printf("%d", diff(x, y));
}
练习8-2
#include
#define max(x,y) ((x)>(y)?x:y)
int main() {
int a, b, c, d;
int max1, max2;
printf("请输入a b c d 的值:\n");
scanf("%d",&a);
scanf("%d", &b);
scanf("%d", &c);
scanf("%d", &d);
max1 = max(max(a, b), max(c, d)); //这个表达式的意思是先求出a，b一组和c，d一组中的较大值，再比较两个较大值求最大值
printf("最大值是%d", max1);
putchar('\n');
max2 = max(max(max(a, b), c), d); //意思是依次比较a和b的较大值，再用较大值依次比较c，d，而求出最大值
printf("最大值是%d", max2);
}
练习8-3
#include
#define swap(int,a,b) {int temp;temp = a;x = y;y = temp;}
int main(void){
int x = 5;
int y = 10;
swap(int, x, y);
printf("x = %d\ny = %d\n", x, y);
return 0;
}
练习8-4
#include
#define number 6
void bsort(int n, int v[]) {
int i, j;
for (i = 0; i < n - 1; i++) {
for (j = n - 1; j > i; j--) {
if (v[j - 1] < v[j]) {
int tem = v[j];
v[j] = v[j - 1];
v[j - 1] = tem;
}
}
}
}
int main() {
int i;
int v[number];
for (i = 0; i < number; i++) {
printf("v[%d]=", i);
scanf("%d", &v[i]);
}
putchar('\n');
bsort(number, v);
for (i = 0; i < number; i++)
{
printf("v[%d]=%d\n", i, v[i]);
}
}
练习 8-5
.......
练习8-6
#include
int factorial(int n) {
int i ;
int sum = 1;
for (i = 1; i <= n; i++) {
sum*=i;
}
return sum;
}
int main() {
int x;
printf("请输入一个数:");
scanf("%d", &x);
printf("它的阶乘是:%d", factorial(x));
}
练习8-7
#include
int factorial(int n)
{
if (n > 0)
return n * factorial(n - 1);
else
return 1;
}
int combination(int n, int r) {
if (n > 0)
return factorial(n) / (factorial(r) * factorial(n - r));
else
return 1;
}
int main() {
int n;
int r;
printf("n=");
scanf("%d", &n);
printf("r=");
scanf("%d", &r);
printf("%d", combination(n, r));
}
练习8-8
#include
int gcd(int x, int y)
{
int z;
if (x != y)
{
if (x > y)
x -= y;
else
y -= x;
z = gcd(x, y);
}
else
z = x;
return z;
}
int main(void)
{
int x, y;
printf("x:");
scanf("%d", &x);
printf("y:");
scanf("%d", &y);
printf("gcd(%d,%d) = %d\n", x, y, gcd(x, y));
return 0;
}
练习8-9
/*---计算标准输入中出现的行数---*/
#include
int main(void)
{
int ch, i = 0;
while ((ch = getchar()) != EOF) {
if (ch == '\n') i++;
}
printf("%d", i);
return 0;
}
练习8-10
#include
int main(void)
{
int i, ch,j;
int cnt[10] = { 0 };
while ((ch = getchar()) != EOF) {
if (ch >= '0' && ch <= '9')
cnt[ch - '0']++;
}
puts("数字字符的出现次数");
for (i = 0; i < 10; i++) {
printf("'%d':", i);
for (j = 0; j < cnt[i]; j++) {
putchar('*');
}putchar('\n');
}
return 0;
}
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来源： https://www.cnblogs.com/nightswatch-candle/p/11890907.html