第一段：变量、表达式、分支、循环

1. 重要的话说三遍

#include <stdio.h>
int main(){int i;for(i=0;i<3;++i){printf("I'm gonna WIN!\n");}return 0;
}

2. I Love GPLT

#include <stdio.h>
int main(){printf("I\n \nL\no\nv\ne\n \nG\nP\nL\nT\n");return 0;
}

3. 输出带框文字

#include <stdio.h>
int main(){printf("************\n  Welcome\n************");return 0;
}

4. 输出菱形图案

#include <stdio.h>
int main(){printf("  A\nA   A\n  A\n");return 0;
}

5. 输出倒三角图案

#include <stdio.h>
int main(){printf("* * * *\n * * *\n  * *\n   *\n");return 0;
}

6. 厘米换算英尺英寸

#include <stdio.h>
int main(){int cm,foot,inch;scanf("%d",&cm);inch=(int)(cm*1.0/30.48*12)%12;foot=(int)(cm*1.0/30.48*12)/12;printf("%d %d",foot,inch);return 0;
}

7. 计算摄氏温度

#include <stdio.h>
int main(){int F,C;scanf("%d",&F);printf("Celsius = %d",5*(F-32)/9);return 0;
}

8. 是不是太胖了

#include <stdio.h>
int main(){int H;scanf("%d",&H);double weight;weight = (H-100)*0.9*2;printf("%.1f",weight);     return 0;
}

9. 求整数均值

#include <stdio.h>
int main(){int i,num=0,sum=0;for(i=0;i<4;++i){scanf("%d",&num);sum+=num;}printf("Sum = %d; Average = %.1f",sum,sum*1.0/4.0);     return 0;
}

10. 算术入门之加减乘除

#include<stdio.h>
int main(){int a,b;double c;scanf("%d %d",&a,&b);c=1.0*a/b;if(a%b==0) printf("%d + %d = %d\n%d - %d = %d\n%d * %d = %d\n%d / %d = %d\n",a,b,a+b,a,b,a-b,a,b,a*b,a,b,(int)c);else printf("%d + %d = %d\n%d - %d = %d\n%d * %d = %d\n%d / %d = %.2f\n",a,b,a+b,a,b,a-b,a,b,a*b,a,b,c);return 0;
}

11. 计算平均分

#include<stdio.h>
int main(){int math=87,eng=72,comp=93;double average=0;average=(math+eng+comp)*1.0/3;printf("math = 87, eng = 72, comp = 93, average = %.0lf\n",average);return 0;
} 

12. 日期格式化

#include<stdio.h>
int main(){int y,m,d;scanf("%d-%d-%d",&m,&d,&y);printf("%d-%02d-%02d",y,m,d);return 0;
}

13. 后天

#include<stdio.h>
int main(){int day,result;scanf("%d",&day);if(day>=1&&day<=5)result=day+2;else result=(day+2)%7;printf("%d",result);return 0;
}

14. 然后是几点

#include<stdio.h>
int main(){int t1,perid,h1,m1,h2,m2,temp;scanf("%d %d",&t1,&perid);h1=t1/100;m1=t1%100;temp=h1*60+m1;temp+=perid;h2=temp/60;m2=temp%60;printf("%d%02d",h2,m2);//注意这里分钟保证为输出两字符用%02d表示return 0;
}

15. BCD解密

#include<stdio.h>
int main(){int x,a,b;scanf("%d",&x);a=x/16;b=x%16;if(b>=10&&b<16){a+=1;b-=10;}printf("%d",a*10+b);return 0;
}

16. 计算符号函数的值

#include<stdio.h>
int main(){int n,sign;scanf("%d",&n);if(n<0)sign=-1;else if(n==0)sign=0; else sign=1;printf("sign(%d) = %d",n,sign);return 0;
}

17. 成绩转换

#include<stdio.h>
int main(){int scores;char res;scanf("%d",&scores);if(scores>=90)res='A';else if(scores>=80)res='B';else if(scores>=70)res='C';else if(scores>=60)res='D';else res='E';printf("%c",res);return 0;
}

18. 出租车计价

#include <stdio.h>int main()
{double p, sum = 0;int t;scanf("%lf %d", &p, &t);if (p <= 3)sum += 10;else if (p <= 10)sum = 10 + (p - 3) * 2;elsesum = 24 + (p - 10) * 3;sum += (t / 5) * 2;printf("%.0lf", sum);return 0;
}

19. 计算天数

#include <stdio.h>
int main()
{int a[12]={31,28,31,30,31,30,31,31,30,31,30,31};int y,m,d,sum=0,i;scanf("%d/%d/%d",&y,&m,&d);for(i=0;i<m-1;++i)sum+=a[i];sum+=d;if((y%4==0&&y%100!=0||y%400==0)&&m>2)sum+=1;printf("%d",sum);return 0;
}

20. 简单计算器

这是我的解法，相对复杂，推荐我解法后面的解法

#include <stdio.h>
int main()
{char ch[100];scanf("%s",ch);int i=0,res=0,flag=-1,sum,num1,num2,fh;
//num1与num2为操作数，sum为每个整数（用于计算超过两位数的数据）,flag=-1则需要计算num1，flag=0则考虑符合，flag=1则计算num2while(ch[i]!='='){if(flag&&ch[i]>='0'&&ch[i]<='9'){sum=0;while(ch[i]>='0'&&ch[i]<='9'){sum*=10;sum+=ch[i]-'0';++i;}if(flag==-1)num1=sum;else if(flag==1){num2=sum;switch (fh){case 1:num1=num1+num2;break;case 2:num1=num1-num2;break;case 3:num1=num1*num2;break;case 4:if(num2)num1=num1/num2;elseflag=-100;break;}}if(flag==-100)break;flag=0;}if(flag==0&&ch[i]!='='){switch (ch[i]){case '+':fh=1;break;case '-':fh=2;break;case '*':fh=3;break;case '/':fh=4;break;default :flag=-100;}if(flag==-100){break;}++i;flag=1;}}if(flag!=-100)printf("%d",num1);else{printf("ERROR");}return 0;
}

简单计算器 https://zhuanlan.zhihu.com/p/116734673

#include <stdio.h>
int main()
{int sum,a;char c;scanf("%d",&sum);while(scanf("%c",&c)){switch(c){case '+':scanf("%d",&a);sum+=a;break;case '-':scanf("%d",&a);sum-=a;break;case '*':scanf("%d",&a);sum*=a;break;case '/':scanf("%d",&a);if(a==0){printf("error");return 0;}else{sum/=a;break;   }case '=':printf("%d",sum);return 0;default :printf("error");return 0;}}return 0;
}

21. 超速判断

#include <stdio.h>
int main()
{int v;scanf("%d",&v);if(v<=60)printf("Speed: %d - OK",v);else printf("Speed: %d - Speeding",v);return 0;
}

22. 用天平找小球

#include <stdio.h>
int main()
{int a,b,c;scanf("%d %d %d",&a,&b,&c);if(a==b)printf("C");else if(a==c)printf("B");else printf("A");return 0;
}

23. 分段计算居民水费

#include <stdio.h>
int main()
{int x;double y;scanf("%d",&x);if(x<=15)y=4.0*x/3;else y=2.5*x-17.5;printf("%.2lf",y);return 0;
}

24. 猜数字游戏

#include<stdio.h>int main()
{int sc,n,num,cnt=0;scanf("%d %d",&sc,&n);while(scanf("%d",&num),num>=0){++cnt;if(cnt>n)break;if(sc==num)break;else if(num>sc)printf("Too big\n");else if(num<sc)printf("Too small\n");}if(cnt<=n&&sc==num){if(cnt==1)printf("Bingo!\n");else if(cnt<=3)printf("Lucky You!\n");elseprintf("Good Guess!\n");}else{printf("Game Over\n");}return 0;
}

25. 求奇数和

#include <stdio.h>
int main()
{int sum=0,a;scanf("%d",&a);while(a>0){if(a%2)sum+=a;scanf("%d",&a);}printf("%d",sum);return 0;
}

26. 最大公约数和最小公倍数

#include <stdio.h>
int main()
{int a,b,ji;scanf("%d %d",&a,&b);ji=a*b;while(a%b){int temp;temp=b;b=a%b;a=temp;}printf("%d %d",b,ji/b);return 0;
}

27.兔子繁衍问题

#include<stdio.h>int main()
{int N,fib[2]={1,1},cnt=1;scanf("%d",&N);while(N>fib[(cnt-1)%2]){fib[(cnt-1)%2]=fib[0]+fib[1];++cnt;}printf("%d",cnt);return 0;
}

28. 求整数的位数及各位数字之和

#include <stdio.h>
int main()
{int number,sum=0,count=0;scanf("%d",&number);while(number>0){sum+=number%10;count++;number/=10;}printf("%d %d",count,sum);return 0;
}

奇技淫巧

#include <stdio.h>
int main()
{int number,sum=0,count=0;while(scanf("%1d",&number)!=EOF){sum+=number;count++;}printf("%d %d",count,sum);return 0;
}

29. 二分法求多项式单根

#include <stdio.h>double a3,a2,a1,a0;
double a,b;double f(double x){return a3*x*x*x+a2*x*x+a1*x+a0;
}int main()
{scanf("%lf %lf %lf %lf",&a3,&a2,&a1,&a0);scanf("%lf %lf",&a,&b);double temp=(a+b)/2;int flag=f(a)>0?1:-1;while(b-a>1e-4){if(f(temp)==0)break;if(flag*f(temp)>0)a=temp;else if(flag*f(temp)<0)b=temp;temp = (a+b)/2;}printf("%.2lf",temp);return 0;
}

30. 念数字

#include <stdio.h>int main()
{char ch;int judge=0;do{scanf("%c",&ch);if(judge&&ch!='\n')printf(" ");judge=1;if(ch=='-')printf("fu");else {switch(ch){case '0':printf("ling");break;case '1':printf("yi");break;case '2':printf("er");break;case '3':printf("san");break;case '4':printf("si");break;case '5':printf("wu");break;case '6':printf("liu");break;case '7':printf("qi");break;case '8':printf("ba");break;case '9':printf("jiu");break;}}}while(ch!='\n');return 0;
}

31. 掉入陷阱的数字

#include <stdio.h>int main()
{int N,sum,count=1;scanf("%d",&N);do{sum=0;int temp=N;do{sum+=temp%10;temp/=10;}while(temp);if(N!=3*sum+1){N=3*sum+1;printf("%d:%d\n",count,N);++count;}else{printf("%d:%d",count,N);break;}}while(1);return 0;
}

32. 求交错序列前N项和

#include <stdio.h>int main()
{double sum=1,k=-1.0;int n,i;scanf("%d",&n);for(i=2;i<=n;++i){sum+=k*i/(2*i-1);k=-k;}printf("%.3lf",sum);return 0;
}

33. 统计素数并求和

#include <stdio.h>int main()
{int m,n,i,j,num=0,sum=0;scanf("%d %d",&m,&n);if(m==0&&n==0)printf("0 0");else{if(m==1)++m;for(i=m;i<=n;++i){int count=0;for(j=2;j<i;++j){if(i%j==0)count++;}if(count==0){num++;sum+=i;}}}printf("%d %d",num,sum);return 0;
}

34. 求分数序列前N项和

#include <stdio.h>
int main()
{long long n;scanf("%lld",&n);double a=2,b=1;double sum=0;for(long long i=0;i<n;++i){sum+=(a*1.0)/b;double tmp=a;a=a+b;b=tmp;}printf("%.2lf",sum);return 0;
}

35. 猴子吃桃问题

#include <stdio.h>
int main()
{int n;scanf("%d",&n);int num=1;for(int i=0;i<n-1;++i){num=(num+1)*2;}printf("%d",num);return 0;
}

36. 韩信点兵

#include <stdio.h>
int main()
{int i=1,n;while(1){n=11*i+10;if(n%7==4&&n%6==5&&n%5==1){printf("%d",n);break;}++i;}return 0;
}

37. 输出整数各位数字

奇技淫巧

#include <stdio.h>
int main()
{int n;while(scanf("%1d",&n)!=EOF){printf("%d ",n);}return 0;
}

38. 支票面额

#include <stdio.h>
int main()
{int y,f,n,flag=1;scanf("%d",&n);for(y=0;y<50;++y){for(f=2*y+1;f<100;++f)if(f*98-y*199==n){printf("%d.%d",y,f);flag=0;break;   }}if(flag)printf("No Solution");return 0;
}

39. 龟兔赛跑

#include <stdio.h>
int main()
{int T,s;scanf("%d",&T);int t1=T/90,t2=T%90;if(t2==0||t2==30||t2==45||t2==60){printf("-_- %d",t1*270+t2*3);}else if((t2>0&&t2<30)||(t2>45&&t2<60)){printf("^_^ ");if(t2<10)printf("%d",t1*270+t2*9);else if(t2<30)printf("%d",t1*270+10*9);else if(t2<50)printf("%d",t1*270+135+(t2-45)*9);else if(t2<60)printf("%d",t1*270+180);}elseprintf("@_@ %d",3*T);return 0;
}

40. 到底是不是太胖了

#include <stdio.h>
int main()
{int n;int h,w;double d;scanf("%d",&n);for(int i=0;i<n;++i){scanf("%d %d",&h,&w);d=(h-100)*0.9*2;if( d>=w&&d-w < d*0.1 || d<w&&w-d < d*0.1 )printf("You are wan mei!\n");else if(w-d+d*0.1<1e-4)printf("You are tai shou le!\n");else if(w-d-1*d*0.1>-1e-4)printf("You are tai pang le!\n");}return 0;
}

41. 计算阶乘和

#include <stdio.h>
int main()
{int i,N,sum=0,jc=1;scanf("%d",&N);for(i=1;i<=N;++i){jc*=i;sum+=jc;}printf("%d",sum);return 0;
}

42. 整除光棍

#include <stdio.h>
#include<string.h>
int main()
{int n,cnt=0,flag=1,num=1,t;scanf("%d",&n);while(1){t=num/n;if(flag&&t==0);else{flag=0;printf("%d",t);}++cnt;if(num%n)num=(num%n)*10+1;else{printf(" %d",cnt);break;}}return 0;
}

43. Shuffling Machine

奇技淫巧

#include <stdio.h>
#include<string.h>
int main()
{int a[55],b[55],c[55];for(int i=0;i<55;++i){scanf("%d",&a[i]);c[i]=b[i]=i;}char ch[54][4]={"S1","S2","S3","S4","S5","S6","S7","S8","S9","S10","S11","S12","S13",
"H1","H2","H3","H4","H5","H6","H7","H8","H9","H10","H11","H12","H13",
"C1","C2","C3","C4","C5","C6","C7","C8","C9","C10","C11","C12","C13",
"D1","D2","D3","D4","D5","D6","D7","D8","D9","D10","D11","D12","D13","J1","J2"};for(int i=1;i<55;++i){int pos=i;for(int j=0;j<a[0];++j){pos=a[pos];}b[pos]=i;}for(int j=1;j<55;++j){if(j!=1)printf(" ");printf("%s",ch[b[j]-1]);}return 0;
}

44. 黑洞数

#include <stdio.h>int cha(int k,int *min,int *max){int a[3],i,j;for(i=0;i<3;++i){a[i]=k%10;k/=10;}for(i=3;i>0;--i){for(j=0;j<i-1;++j){if(a[j]>a[j+1]){int temp=a[j];a[j]=a[j+1];a[j+1]=temp;}}}*min=100*a[0]+10*a[1]+a[2];*max=100*a[2]+10*a[1]+a[0];int t=*max-*min;return t;
}int main(){int k,min=0,max=0,res;scanf("%d",&k);int cnt=0;if(k==495){++cnt;k=cha(k,&min,&max);printf("%d: %d - %d = %d\n",cnt,max,min,k);}elsewhile(k!=495){++cnt;k=cha(k,&min,&max);printf("%d: %d - %d = %d\n",cnt,max,min,k);}return 0;
}

45. 找完数

#include <stdio.h>int wanshu(int num,int a[]){int i,sum=0,j=0,flag=0;for(i=1;i<num;++i){if(num%i==0){a[j]=i;++j;sum+=i;}}if(sum==num)flag=1;return flag;
}int main(){int n,m,a[1500]={0},i,j,cnt=0;scanf("%d %d",&m,&n);for(i=m;i<=n;++i){if(wanshu(i,a)){++cnt;printf("%d = ",i);for(j=0;a[j]!=0;++j){printf("%d",a[j]);if(a[j+1]!=0)printf(" + ");}printf("\n");}for(j=0;j<50;++j){a[j]=0;}}if(!cnt)printf("None");return 0;
}

46. 爬动的蠕虫

#include <stdio.h>int main(){int n,u,d,l=0,t=0;scanf("%d %d %d",&n,&u,&d);while(l<n){l+=u;t+=1;if(l>=n)break;t+=1;l-=d;}printf("%d",t);return 0;
}

47. 二进制的前导的零

#include <stdio.h>int main(){int n,cnt=0;scanf("%d",&n);if(n<0)printf("0");else{while(n){++cnt;n/=2;}printf("%d",32-cnt);}return 0;
}

48. 求组合数

奇技淫巧

#include <stdio.h>int main(){int m,n;double res=1;scanf("%d %d",&m,&n);for(int i=0;i<m;++i){res*=(n-i)*1.0/(m-i);}printf("result = %.lf",res);return 0;
}

49. Have Fun with Numbers

#include <stdio.h>
#include<string.h>
int main(){char ch[21],res[22];int a[10]={0};scanf("%s",ch);int len=strlen(ch),flag=0,jw=0,t;for(int i=len-1;i>=0;--i){t=(ch[i]-'0')*2+jw;jw=0;if(t>9)jw=1;res[i+1]='0'+t%10;++a[ch[i]-'0'];}if(jw==1){res[0]='1';++a[1];}else{res[0]='0';flag=1;}++len;for(int i=flag;i<len;++i){--a[res[i]-'0'];}int jd=1;for(int i=0;i<10;++i){if(a[i]){jd=0;break;}}if(jd)printf("Yes\n");elseprintf("No\n");for(int i=flag;i<len;++i)printf("%c",res[i]);return 0;
}

50. 输出华氏-摄氏温度转换表

#include<stdio.h>
int main(){int lower,upper;double cel;scanf("%d %d",&lower,&upper);if(lower<=upper){printf("fahr celsius\n");for(int i=lower;i<=upper;i+=2){cel=5.0*(i-32)/9;printf("%d%6.1lf\n",i,cel);}}else{printf("Invalid.");}return 0;
}

51. 求奇数分之一序列前N项和

#include<stdio.h>
int main(){int n;scanf("%d",&n);double sum=0;for(int i=0;i<n;++i){sum+=1.0/(i*2+1);}printf("sum = %.6lf",sum);return 0;
}

52. 求简单交错序列前N项和

#include<stdio.h>
int main(){int n,k=1;scanf("%d",&n);double sum=0;for(int i=0;i<n;++i){sum+=1.0*k/(i*3+1);k=-k;}printf("sum = %.3lf",sum);return 0;
}

53. 生成3的乘方表

#include<stdio.h>
int main(){int n;long long t=1;scanf("%d",&n);for(int i=0;i<=n;++i){printf("pow(3,%d) = %lld\n",i,t);t*=3;}return 0;
}

54. 求阶乘序列前N项和

#include<stdio.h>
int main(){int n;long long t=1,sum=0;scanf("%d",&n);for(int i=1;i<=n;++i){t*=i;sum+=t;}printf("%lld",sum);return 0;
}

55. 查询水果价格

#include<stdio.h>
int main(){printf("[1] apple\n[2] pear\n[3] orange\n[4] grape\n[0] exit\n");char ch[4][7]={"apple","pear","orange","grape"};double a[4]={3.00,2.50,4.10,10.20};int i,t;for(i=0;i<5;++i){scanf("%d",&t);if(t==0)break;else{printf("price = %.2lf\n",a[t-1]);}}return 0;
}

56. 求给定精度的简单交错序列部分和

#include<stdio.h>
int main(){double x,sum;scanf("%lf",&x);int i=1,k=1;while(1){sum+=k*1.0/i;if(1.0/i<=x)break;i+=3;k=-k;}printf("sum = %.6lf",sum);return 0;
}

57. 求e的近似值

#include<stdio.h>int main()
{int n;scanf("%d",&n);double jc=1.0,sum=1;for(int i=1;i<=n;++i){jc/=i;sum+=jc;}printf("%.8lf",sum);return 0;
}

58. 求幂级数展开的部分和

#include<stdio.h>
int main()
{double x,t,sum=1;scanf("%lf",&x);t=x;int i=1;while(t>=0.00001||t<=-0.00001){sum+=t;++i;t*=x*1.0/i;}sum+=t;printf("%.4lf",sum);return 0;
}

59. 打印菱形图案

#include<stdio.h>
int main()
{int n;scanf("%d",&n);for(int i=0;i<(n+1)/2;++i){for(int j=n-2-i*2;j>=0;--j){printf(" ");}for(int j=0;j<2*i+1;++j){printf("* ");}printf("\n");}for(int i=0;i<n/2;++i){for(int j=0;j<i+1;++j){printf("  ");}for(int j=(n-i*2-2);j>0;--j){printf("* ");}printf("\n");}return 0;
}

60. Welcome to You!

#include<stdio.h>
int main()
{printf("Welcome to You!");return 0;
}

61. Programming in C is fun!

#include<stdio.h>
int main()
{printf("Programming in C is fun!");return 0;
}

62. 计算物体自由下落的距离

#include<stdio.h>
int main()
{printf("height = %.2lf",10.0*3*3/2);return 0;
}

63. 高空坠球

#include<stdio.h>
int main()
{int h,n,i;scanf("%d %d",&h,&n);double sum=h,t=h;for(int i=0;i<n-1;++i){sum+=t;t/=2;}if(n)printf("%.1lf %.1lf",sum,t/2);elseprintf("0.0 0.0");
}

64. 统计大写辅音字母

#include<stdio.h>
#include<string.h>int main()
{int cnt=0,i;char ch[81];scanf("%[^\n]",ch);int len=strlen(ch);for(int i=0;i<=len;++i){if(ch[i]>'A'&&ch[i]<='Z'&&ch[i]!='E'&&ch[i]!='O'&&ch[i]!='U'&&ch[i]!='I')++cnt;}printf("%d",cnt);return 0;
}

65. 字符串替换

#include<stdio.h>
#include<string.h>int main(){char ch[81];gets(ch);int n = strlen(ch);for(int i=0;i<n;++i){if(ch[i]>='A'&&ch[i]<='Z'){ch[i]='A'+(25-(ch[i]-'A'));}}printf("%s",ch);return 0;
}

66. 时间换算

#include<stdio.h>int main(){int h,m,s;scanf("%d:%d:%d",&h,&m,&s);int n;scanf("%d",&n);int p,q,r,t,u;p=(s+n)%60;q=(s+n)/60;r=(q+m)%60;t=(q+m)/60;u=(t+h)%24;printf("%02d:%02d:%02d",u,r,p);return 0;
}

67. What is a computer?

#include<stdio.h>
int main(){printf("What is a computer?");return 0;
}

68. 求N分之一序列前N项和

#include<stdio.h>int main(){int n;scanf("%d",&n);double sum=0;for(int i=0;i<n;++i){sum+=1.0/(i+1);}printf("sum = %lf",sum);return 0;
}

69. 换硬币

#include<stdio.h>int main(){int n;scanf("%d",&n);int count=0;int total,remain;int c=n/5;for(int i=0;i<c;++i){int k = c-i;remain=n-k*5;int d=remain/2;for(int j=0;j<d;++j){int p = d-j;int remain1=remain-p*2;if(!remain1)continue;printf("fen5:%d, fen2:%d, fen1:%d, total:%d\n",k,p,remain1,k+p+remain1);++count;}}printf("count = %d",count);return 0;
}

70. 输出三角形面积和周长

#include<stdio.h>
#include<math.h>
int main(){int a,b,c;scanf("%d %d %d",&a,&b,&c);if(a+b<=c||a+c<=b||b+c<=a){printf("These sides do not correspond to a valid triangle");}else{double s = (a+b+c)/2.0;double area = sqrt(s*(s-a)*(s-b)*(s-c)),cir = a+b+c;printf("area = %.2lf; perimeter = %.2lf",area,cir);}return 0;
}

71. 求平方与倒数序列的部分和

#include<stdio.h>int main(){int m,n;double sum=0;scanf("%d %d",&m,&n);for(int i=m;i<=n;++i){sum+=i*i+1.0/i;}printf("sum = %lf",sum);return 0;
}

72. 三天打鱼两天晒网

#include<stdio.h>int main(){int n;scanf("%d",&n);if(n%5<=3&&n%5){printf("Fishing in day %d",n);}else{printf("Drying in day %d",n);}
}

73. 比较大小

#include<stdio.h>
int main(){int a,b,c;scanf("%d%d%d",&a,&b,&c);if(a>b){int tmp = a;a=b;b=tmp;}if(a>c){int tmp=c;c=b;b=a;a=tmp;}if(b>c){int tmp=b;b=c;c=tmp;}printf("%d->%d->%d",a,b,c);
}

74. 三角形判断

#include<stdio.h>
#include<math.h>
int main()
{double a,b,c,x1,y1,x2,y2,x3,y3,A,p;scanf("%lf%lf%lf%lf%lf%lf",&x1,&y1,&x2,&y2,&x3,&y3);a=sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2));b=sqrt((x1-x3)*(x1-x3)+(y1-y3)*(y1-y3));c=sqrt((x3-x2)*(x3-x2)+(y3-y2)*(y3-y2));if (a+b<=c || b+c<=a || a+c<=b){printf("Impossible");}else{p=(a+b+c)/2;A=sqrt(p*(p-a)*(p-b)*(p-c));printf("L = %.2f, A = %.2f",2*p,A);}return 0;
}

75. 整数152的各位数字

#include<stdio.h>int main(){printf("152 = %d + %d*10 + %d*100",152%10,152/10%10,152/100);return 0;
}

76. 计算分段函数[3]

#include<stdio.h>
int main(){double x;scanf("%lf",&x);if(x>10-1e-6&&x<10+1e-6){printf("f(%.1lf) = %.1lf",x,1.0/x);}else{printf("f(%.1lf) = %.1lf",x,x);}return 0;
}

77. 求1到100的和

#include<stdio.h>
int main(){int sum = 0;for(int i=1;i<101;++i){sum+=i;}printf("sum = %d",sum);return 0;
}

78. 计算油费

#include<stdio.h>int main(){int a,b;char c;scanf("%d %d %c",&a,&b,&c);double discount = c=='m'?0.95:0.97;double price = b==90?6.95:b==93?7.44:7.93;double sum = a * price *discount;printf("%.2lf",sum);return 0;
}

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