第5章，2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
#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;}