1-7-1 求幂级数展开的部分和
#include<stdio.h> #include<math.h> int main() { double x = 0; scanf("%lf",&x); double add = 1.0,sum = 1.0; int i = 1; for(i = 1;;i++) { add=(add*x)/i; sum+=add; if(add<0.00001) break; } printf("%.4lf",sum); return 0; }
1-7-2 查询水果价格
#include<stdio.h> void menu() { printf("[1] apple\n[2] pear\n[3] orange\n[4] grape\n[0] exit\n"); } int main() { menu(); int c = 0, n; while(++c<6) { scanf("%d",&n); if(n == 0) break; switch(n) { case 1:printf("price = 3.00\n"); break; case 2:printf("price = 2.50\n"); break; case 3:printf("price = 4.10\n"); break; case 4:printf("price = 10.20\n"); break; default:printf("price = 0.00\n"); break; } } return 0; }
1-7-3 猜数字游戏
#include<stdio.h> int main() { int rad1, N; scanf("%d%d", &rad1, &N); int gs = 0; if(rad1>0&&rad1<=100&&N>3) { for(int i = 0;i<N;i++) { scanf("%d", &gs); if (gs <= 0) { printf("Game Over"); return 0; } else if (gs < rad1) printf("Too small\n"); else if(gs>rad1) printf("Too big\n"); else if(gs==rad1&&i == 0) { printf("Bingo!\n"); return 0; } else if(gs == rad1&&(i == 1||i==2)) { printf("Lucky You!\n"); return 0; } else if(gs == rad1) { printf("Good Guess!\n"); return 0; } } printf("Game Over\n"); return 0; } }
1-7-4 特殊a串数列求和
#include<stdio.h> int main() { int a,n; scanf("%d%d",&a,&n); int s = 0,sum = 0; for(int i = 1;i<=n;i++) { s = s*10+a; sum += s; } printf("s = %d",sum); }
1-7-5 成绩统计分析表
#include<stdio.h> void Print_s(double i)//把打印*封装成一个函数，方便 { int n = (int)floor(i+0.5);//四舍五入 for(int j = 0;j<n;j++) printf("*"); } int main() { int n; scanf("%d", &n); double arr[1000] = { 0.0 }; double sum = 0.0,max = 0.0,min = 1000.0,avg; int a=0,b=0,c=0,d=0,e=0; for (int i = 0; i < n; i++) { scanf("%lf", &arr[i]); sum += arr[i]; if(arr[i]>max) max = arr[i]; if(arr[i]<min) min = arr[i]; if(arr[i]>=90&&arr[i]<=100) a++; else if(arr[i]>=80&&arr[i]<90) b++; else if(arr[i]>=70&&arr[i]<80) c++; else if(arr[i]>=60&&arr[i]<70) d++; else if(arr[i]>=0&&arr[i]<60) e++; } for (int i = 0; i < n; i++) { printf("%03d:%6.1lf ", i+1, arr[i]); Print_s(arr[i]); printf("\n"); } avg = sum / n; printf("\nMax: %5.1lf ",max); Print_s(max); printf("\nMin: %5.1lf ",min); Print_s(min); printf("\nAvg: %5.1lf ",avg); Print_s(avg); printf("\n"); double A = 100.0*a/n,B=100.0*b/n,C = 100.0*c/n,D = 100.0*d/n,E = 100.0*e/n; //printf里打印一个百分号“%”要写两个：%% printf("\nA:%6.1lf%%",A); printf(" "); Print_s(A); printf("\nB:%6.1lf%%",B); printf(" "); Print_s(B); printf("\nC:%6.1lf%%",C); printf(" "); Print_s(C); printf("\nD:%6.1lf%%",D); printf(" "); Print_s(D); printf("\nE:%6.1lf%%",E); printf(" "); Print_s(E); return 0; }
1-7-6 换硬币
#include<stdio.h> int main() { int x = 0; scanf("%d", &x); int f5 = 0, f2 = 0, f1 = 0; int count = 0; for (int i = x/5;; i--) { f5 = i; for (int j = (x-5*f5)/2;; j--) { f2 = j; f1 = x - 5 * f5 - 2 * f2; if (f2 == 0) { break; } if (f1 <= 0) { continue; } printf("fen5:%d, fen2:%d, fen1:%d, total:%d\n", f5, f2, f1, f1 + f2 + f5); count++; } if ((f5 == 1)) { printf("count = %d\n", count); break; } } return 0; }
1-7-7 验证“哥德巴赫猜想”
#include<stdio.h> #include<math.h> int Prime(long long i) { int c = 0; for(long long int j = 2;j<=sqrt(i);j++) { if(i%j==0) return 0; } return 1; } int main() { long long int n; scanf("%lld",&n); for(long long int i = 2;i<n;i++) { if(Prime(i)&&Prime(n-i)) { printf("%lld = %lld + %lld",n,i,n-i); break; } else continue; } return 0; }
