C语言easy.doc

PAGE  PAGE 26 Problem 1 表格问题 #includestdio.h void output(const int* a) { printf(%d %d %d\n,a[0], a[1], a[2]); printf(%d %d %d\n,a[3], a[4], a[5]); } int ok(const int* a) { int used[7] = {0};//used[i]的值为0：i尚未被用；1：i已被使用 int i; for (i = 1; i 5; i++) { if ( used[ a[i] ] ) return 0; used[ a[i] ] = 1; } //for循环结束意味着a[i]互不相同 return a[1] a[2] a[3] a[4] a[0] a[3] a[1] a[4]; } int main() { int n = 0, i, rank; int table[5][6];//存放按照字典序排序的5种表格 int a[6]; //存放1种表格 a[0] = 1; a[5] = 6; for (a[1] = 2; a[1] = 5; a[1]++) for (a[2] = 2; a[2] = 5; a[2]++) for (a[3] = 2; a[3] = 5; a[3]++) for (a[4] = 2; a[4] = 5; a[4]++) if ( ok(a) ) { for (i = 0; i 6; i++) table[n][i] = a[i]; n++; //行下标加1 } while (scanf(%d,rank)==1) output( table[rank - 1] ); return 0; } Problem 2 奇妙的数字 #includestdio.h int digitSum(int n) { int sum = 0; while (n 0) { sum += n % 10; n /= 10; } return sum; } int main() { int answer[10];//存放前10个满足条件的数 int n, i; for (n=0,i=1; n 10; i++) { if ( 0 == digitSum(i) % 17 0 == digitSum(i + 1) % 17) { answer[n++] = i; } } while (scanf(%d,i)==1) { printf(%d\n,answer[i - 1]); } return 0; } Problem 5 求绝对值 //版本1 #includestdio.h int main() { char line[1002]; while (scanf(%s,line)!=EOF) { if ( - == line[0] ) printf(%s\n,line+1); else printf(%s\n,line); } return 0; } //版本2 #includestdio.h int main() { char ch; while(scanf(%c, ch)!=EOF) { if(ch!=-) printf(%c,ch); } return 0; } Problem 6 求最大公约数 #includestdio.h int gcd(int m,int n)//辗转相除法 { int r=m%n; while(r) { m=n; n=r; r=m%n; } return n; } int main() { int M,N; while(scanf(%d%d,M,N)==2) { printf(%d\n,gcd(M,N)); } return 0; } Problem 7 求反数字字符串 #in