第五章第二次练习

1.定义两个整数变量n=0，i=0；
2.判断i<3,值为真走3，否则结束；
3.判断n++0||n++1||n++2||n++3值为真输出n++，否则走4；
4.i++，返回2；
#include
#includeint main() { int n = 0, i; for(i=0;i<3;i++) switch (n++) { case 0: case 1: case 2: case 3: printf("%2d", n++); } return 0;}

1.定义六个整数型变量n,i,k,j,p,sum
2.n=23.n<=10值为真走4，否则结束4.k=nnn;i=1;5.i=k/2值为真输出转15，否则转1515.n++返回3在这里插入图片描述#

#include
#includeint main() { long n, i, k, j, p, sum; for (n = 2; n <= 10; n++) { k = n * n * n; for (i = 1; i < k / 2; i += 2) { for (j = i, sum = 0; sum < k; j += 2) sum += j; if (sum == k) { printf("n%ld*%ld*%ld=%ld=", n, n, n, sum); for (p = i; p < j - 2; p += 2) printf("%ld+", p); printf("%ld", p); break; } } if (i >= k / 2) printf("nerror!"); } return 0;}


1.定义五个整数变量m,n,k,s,flag=0;
2.给k赋值3.n=k4.m=n5.s=n*(n-m)-mm6.ss1值为真flag=1转7，否则m–转77.m>0&&!flag值为真返回5，否则转88.m0值为真n–转9，否则转99.n>0&&!flag值为真转4否则输出m，n
#include
int main(){long m, n,k,s,flag = 0;printf(“input k:”);scanf_s("%ld", &k);n = k;do { m = n; do { s = n * (n - m) - m * m; if (s * s == 1) flag = 1; else m–; } while (m > 0 && !flag); if (m == 0) n–;} while (n > 0 && !flag);printf(“m=%ld,n=%ld”, m, n); return 0;}


1.定义整数变量i,j,n,line=0
2.给n赋值3.n<=1值为真返回2，否则转44.i=25.i<=n值为真走6，否则结束6.j=27.j #include
int main(){ int i, j, line = 0; long int n; printf(“输入一个数：”); scanf_s("%ld", &n); while (n <= 1) { printf(“请重新输入一个数：”); scanf_s("%ld", &n); } for (i = 2; i <= n; i++) { for (j = 2; j < i; j++) { if (i % j == 0) { break; } } if (j == i && i % 10 != 9) { printf("%dt", i); line++; if (line == 10) { printf("n"); line = 0; } } } return 0;}


1.定义整数变量i,j,n,temp,sum=0
2.给n赋值3.n<1||n>10值为真返回2否则转44.i=05.i #include
int main(){ int i, j,n; long temp, sum = 0; printf(“输入一个数：”); scanf_s("%d", &n); while (n < 1 || n>10) { printf(“请重新输入一个数：”); scanf_s("%d", &n); } for (i = 0; i < n; i++) { temp = 0; for (j = 0; j <= i; j++) { temp += (long int)pow(10, j) * (i + 1); } sum += temp; } printf(“sum=%ldn”, sum); return 0;}


1.定义整数变量i，j,n=0,sum
2.i=3
3.i<=1000值为真走4，否则输出n，结束
4.sum=0
5.j=1
6.j 7.n%j0值为真走9，否则转8
8.j++返回6
9.sum=sum+j返回8
10.isum值为真走12否则转11
11.i++返回3
12.输出i
13.n++
14.n%50值为真走15否则转11
15输出换行返回11
#include
int main(){
int i, j, n = 0, sum;
for (i = 3; i <= 1000; i++) {
sum = 0;
for (j = 1; j < n - 1; j++)
if (n % j == 0)
sum = sum + j;
if (i == sum) {
printf("%d", i);
n++;
if (n % 5 == 0)
printf("n");
}
}
printf("n%dn", n);
return 0;
}

1.定义整数变量i，j,n=0,sum
2.i=3
3.i<=1000值为真走4，否则输出n，结束
4.sum=0
5.j=1
6.j 7.n%j0值为真走9，否则转8
8.j++返回6
9.sum=sum+j返回8
10.isum值为真走12否则转11
11.i++返回3
12.输出i
13.n++
14.n%50值为真走15否则转11
15输出换行返回11

#include
int main(){
int i, n = 0;
for (i = 1900; i <= 2000; i++) {
if (i % 4 == 0 && i % 100 != 0 || i % 400 == 0) {
printf("%dt", i);
n++;
if (n % 3 == 0) {
printf("n");
}
}
}
return 0;
}

1.定义整数变量i，n=0
2.i=1900
3.i<=2000值为真走4，否则结束
4.i % 4 == 0 && i % 100 != 0 || i % 400 == 0值为真走6，否则转5
5.i++返回3
6.输出i
7.n++
8.n%30值为真输出换行返回5，否则返回5

#include
int main(){
int i, a, b, c, n = 0;
for (i = 100; i <= 999; i++) {
a = i / 100;
b = (i - a * 100) / 10;
c = i % 10;
if (a * a * a + b * b * b + c * c * c == i) {
printf("%dt", i);
n++;
if (n % 2 == 0) {
printf("n");
}
}
}
return 0;
}

1.定义整数变量i,a,b,c,n=0
2.i=100
3.i<=999值为真走4，否则结束
4.a = i / 100
5.b = (i - a * 100) / 10
6.c = i % 10
7.a * a * a + b * b * b + c * c * c == i值为真走9，否则转8
8.i++返回3
9.输出i
10.n++
11.n%20值为真输出换行返回8，否则转8

#include
int main(){
int k = 1, i, n, t;
float e = 1, s = 1;
scanf_s("%d", &n);
do {
t = 1;
for (i = 1; i <= k; i++)
t = t * i;
e = e + 1.0 / t;
k++;
} while (k <= n);
printf("%.2f", e);
return 0;
}

1.定义小数变量y,s=1,x,xx=1,a=1,i=1
2.给x赋值
3.a=-a
4.i++
5.xx = xx * x
6.y = i / xx
7.s = s + a * y
8.y>0.00001值为真走3，否则输出s

#include
int main(){
float y, s = 1, x, xx = 1, a = 1, i = 1;
scanf_s("%f", &x);
do {
a = -a;
i++;
xx = xx * x;
y = i / xx;
s = s + a * y;
} while (y > 0.00001);
printf("%f", s);
return 0;
}