C程序设计

C语言程序1;#include<stdio.h>int main(){printf("this is a C program\n");return 0;}2求a+b;#include<stdio.h>int main(){int a,b,sum;scanf("%d%d",&a,&b);sum=a+b;printf("sum=%d",sum);return 0;}#include<stdio.h>int main(){int a,b,sum;scanf("%d%d",&a,&b);printf("sum=%d",a+b);return 0;}3求两个整数中的大着#include<stdio.h>int main(){int a,b,max;scanf("%d%d",&a,&b);if(a>b)max=a;else max=b;printf("max=%d",max);return 0;}#include<stdio.h>int main(){int a,b,n;int max(int a,int b);scanf("%d%d",&a,&b);printf("max=%d",n=max(a,b));return 0;}int max(int a,int b){int m;if(a>b)m=a;else m=b;return m;}4 Very good#include<stdio.h>int main(){printf("**************\nVery good!\n**************\n");return 0;}5求1*2*3*4*5#include<stdio.h>int main(){int J,i;J=1;for(i=1;i<=5;i++)J=J*i;printf("%d",J);return 0;}#include<stdio.h>int main(){int m;int M();m=M();printf("%d",m);return 0;}int M(){int i;int n=1;while(i<=5){n*=i;i++;}return n;}#include<stdio.h> int main(){int m;int M();m=M();printf("%d",m);return 0;}int M(){int i;int n=1;do{n*=i;i++;}while(i<=5);return n;}6求1-1/2+1/3-1/4+…+1/99-1/100 #include<stdio.h>int main(){int sign=1;double term,sum=1.0,deno=2.0;while(deno<=100){sign=-sign;term=sign/deno;sum=sum+term;deno=deno+1;}printf("sum=%f",sum);return 0;}(其他循环类似上题)7、输出3到100之间的非素数#include<stdio.h>int main(){int n=3;int i;for(n=3;n<=100;n++){for(i=2;i<=n/2;i++){if(n%i==0)printf("%d is not prime\n",n);break;}}return 0;}8、判断2000至2005之间的闰年#include<stdio.h>int main(){int year;for(year=2000;year<=2500;year++){if(year%4==0)if(year%100!=0)printf("%d 是闰年\n",year);continue;if(year%400==0)printf("%d 是闰年\n ",year);continue;}return 0;}#include<stdio.h>int main(){int year;for(year=2000;year<=2500;year++){if(year%4==0&&year%100!=0||year%400==0) printf("%d 是闰年\n",year);continue;}return 0;}8、输入十个数求出最大值#include<stdio.h>int main(){int i=1;int m,max;scanf("%d",&m);max=m;while(i<=9){max=max>m?max:m;i++;scanf("%d",&m);}max=max>m?max:m;printf("%d",max);return 0;}#include"stdio.h"int main(){int b[10];int m,i;for(i=0;i<=9;i++)scanf("%d",&b[i]);m=b[0];for(i=0;i<=9;i++)m=b[i]>m?b[i]:m;printf("%d",m);return 0;}9、输入3个数按有小到大顺序输出#include"stdio.h"int main(){float a,b,c;float t;scanf("%f%f%f",&a,&b,&c);if(a>b){t=a;a=b;b=t;}if(a>c){t=a;a=c;c=t;}if(b>c){t=b;b=c;c=t;}printf("%f\t%f\t%f\t",a,b,c);return 0;}#include"stdio.h"void range(float a,float b,float c){float t;if(a>b){t=a;a=b;b=t;}if(a>c){t=a;a=c;c=t;}if(b>c){t=b;b=c;c=t;}printf("%f\t%f\t%f\t",a,b,c);//换成printf("%8.3f%8.3f%8.3f",a,b,c);观察运行结果；改变8.3的值呢？}int main(){float x,y,z;scanf("%f%f%f",&x,&y,&z);range(x,y,z);return 0;}#include"stdio.h"int main(){float a[3];float t;int i,j;for(i=0;i<3;i++)scanf("%f",&a[i]);for(j=0;j<2;j++){for(i=0;i<2;i++)//等价于for(i=0;i<i-j;i++)只是时间复杂度不同{if(a[i]>a[i+1]){t=a[i];a[i]=a[i+1];a[i+1]=t;}}}for(i=0;i<3;i++)printf("%f\t",a[i]);return 0;}本题修改相关数字即可对更多数排序如下;#include"stdio.h"int main(){float a[6];float t;int i,j;for(i=0;i<6;i++)scanf("%f",&a[i]);for(j=0;j<5;j++)//5可以换成6{for(i=0;i<5-j;i++){if(a[i]>a[i+1]){t=a[i];a[i]=a[i+1];a[i+1]=t;} }}for(i=0;i<6;i++)printf("%f\t",a[i]);return 0;}void sort(int a[]){int i,j,t;for(i=0;i<4;i++){for(j=0;j<4-i;j++){if(a[j]>a[j+1]){t=a[j];a[j]=a[j+1];a[j+1]=t;}}}}int main(){int i,b[5];for(i=0;i<5;i++){scanf("%d",&b[i]);}sort(b);for(i=0;i<5;i++){printf("%d ",b[i]);}return 0;}//指针对数排序#include<stdio.h>void sort(int n,int a[]) {int i,j,t;for(i=0;i<n-1;i++){for(j=0;j<n-1-i;j++){if(a[j]>a[j+1]){t=a[j];a[j]=a[j+1];a[j+1]=t;}}}}int main(){int i,*p,b[5];p=b;for(i=0;i<5;i++){scanf("%d",&b[i]);}sort(5,p);for(i=0;i<5;i++){printf("%d ",b[i]);}return 0;}//指针对数排序#include<stdio.h>void sort(int n,int a[]) {int i,j,t;for(i=0;i<n-1;i++){for(j=0;j<n-1-i;j++){if(a[j]>a[j+1]){t=a[j];a[j]=a[j+1];a[j+1]=t;}}}}int main(){int i,*p,b[5];p=b;for(i=0;i<5;i++){scanf("%d",&b[i]);}sort(5,p);for(i=0;i<5;i++){printf("%d ",p[i]);}return 0;}//指针对数排序#include<stdio.h>void sort(int n,int a[]) {int i,j,t;for(i=0;i<n;i++){for(j=0;j<n-1-i;j++){if(a[j]>a[j+1]){t=a[j];a[j]=a[j+1];a[j+1]=t;}}}}int main(){int i,b[5];for(i=0;i<5;i++){scanf("%d",&b[i]);}sort(5,b);for(i=0;i<5;i++){printf("%d ",b[i]);}return 0;}#include<stdio.h>int main(){int a[4];int i,j,m,t;for(i=0;i<4;i++)scanf("%d",&a[i]);for(i=0;i<3;i++){m=a[i];t=i;for(j=i+1;j<4;j++)if(a[t]>a[j])t=j;a[i]=a[t];a[t]=m;}for(i=0;i<4;i++)printf("%d ",a[i]);return 0;}10 、输入一个数判断能否被3和5整除#include<stdio.h>int main(){int m,n;scanf("%d",&m);if(m%3==0&&m%5==0)n=1;else n=0;if(n)printf("%d能被3和5整除",m);else printf("%d不能被3和5整除",m);return 0;}11、求1到100的和#include<stdio.h>int main(){int add();int m;printf("%d",m=add());return 0;}int add(){int i,sum;for(i=1;i<=100;i++){sum+=i;}return sum;}12、求俩的数的最大公约数#include<stdio.h>int main(){int DYS(a,b);int m,n;scanf("%d%d",&m,&n);printf("%d",DYS(m,n));return 0;}int DYS(int a,int b){int i;for(i=a<b?a:b;i>0;i--){if(a%i==0&&b%i==0)break;}return i;}13、最小公倍数#include<stdio.h>int main(){int m,n,i;scanf("%d%d",&m,&n);for(i=m>n?m:n;;i++)if(i%m==0&&i%n==0)break;printf("%d",i);return 0;}以上两题相结合可以求两个数的最大公约数和最小公倍数自己写.以下介绍一种新方法14、求两个数的最小公倍数和最大公约数#include<stdio.h>int main(){int m,n,a,b,r;scanf("%d%d",&m,&n);a=(m>n)?m:n;b=(m<n)?m:n;r=a%b;while(r!=0){a=b;b=r;r=a%b;}printf("最大公约数是%d\n最小公倍数是%d\n",b,m*n/b);return 0;}15/求二次方程的根#include<stdio.h>#include<math.h>int main (){double a,b,c;double r,p,q;printf("please enter a,b,c(a!=0)");scanf("%lf%lf%lf",&a,&b,&c);r=b*b-4*a*c;p=-b/(2*a);printf("The equation");if(fabs(r)<=1e-6)printf("has two equal roots\n%8.4f\n",p);else if(r>1e-6){q=sqrt(r)/(2*a);printf("has two realroots\n%8.4f %8.4f\n",p+q,p-q);}else{q=sqrt(-r)/(2*a);printf("has two complexroots\n%8.4f+%8.4fi\n%8.4f-%8.4i\n",p,q,p,q);}return 0;}15、ASCII码的使用#include<stdio.h>int main (){printf("%c %c\n",'a','a'-32);printf("%d %d\n",'a','a'-32);return 0;}16、字符数据的输入与输出#include<stdio.h>int main (){char c;c=getchar();putchar(c);return 0;}17、break、与continue改变循环状态#include"stdio.h"#define SUM 10000int main(){float amount, aver,total;int i;for(i=1,total=0;i<=1000;i++){printf("please enter the amount: ");scanf("%f",&amount);total+=amount;if(total>=SUM)break;}aver=total/i;printf("total=%f\naver=%f\nnum=%d\n",total,aver,i);return 0;}#include"stdio.h"int main(){int n;for(n=100;n<=200;n++){if(n%3==0)continue;else printf("%d ",n);}printf("\n");return 0;}#include"stdio.h"int main(){int i,j,m,n,t;t=1;scanf("%d%d",&m,&n);for(i=1;i<=m;i++){for(j=1;j<=n;j++){if(i%3==0&&j==2){printf(" ");continue;}//huancheng continue kankan.printf("%5d ",i*j);}printf("\n");}printf("\n");return 0;}18、Fibonacci数列#include"stdio.h"int main(){int f1=1,f2=1;int i;for(i=1;i<=20;i++){printf("%12d%12d",f1,f2);if(i%2==0)printf("\n");f1=f1+f2;f2=f2+f1;}return 0;}#include<stdio.h>int main(){int i;int f[40];f[0]=1;f[1]=1;for(i=2;i<=40;i++)f[i]=f[i-1]+f[i-2];for(i=0;i<=40;i++){if(i%5==0)printf("\n");printf("%14d",f[i]);}return 0;}19、判断一个大于3的书是否是素数#include"stdio.h"#include"math.h"int main(){int n,i,k;printf("enter the number(n>=3):");scanf("%d",&n);k=(int)sqrt(n);for(i=2;i<=k;i++)if(n%i==0)break;if(i<=k)printf("%d is not a prime",n);else printf("%d is a prime",n);return 0;}20、求100到200之间的非素数#include"stdio.h"#include"math.h"int main(){int n,i,k;for(n=100;n<=200;n++){k=(int)sqrt(n);for(i=2;i<=k;i++)if(n%i==0)break;if(i<=k)printf("%d is not a prime\n",n);//else printf("%d is a prime\n",n);}return 0;}21、密码#include"stdio.h"int main(){char c;while((c=getchar())!='\n'){if((c>='a'&&c<='z')||(c>='A'&&c<='Z'))c=c+4;{if((c>='z'&&c<='z'+4)||(c>='Z'&&'c'<='Z'+4))c=c-26;}putchar(c);}return 0;}22、求a+aa+aaa+aaaa+aa…(n个a)总共n个数的和#include"stdio.h"int main(){int a,n,sum;sum=0;scanf("%d%d",&a,&n);for(;n>0;n--){sum=sum+n*a;a=a*10;}printf("%d",sum);return 0;}23、求n的结成#include"stdio.h"int main(){int n,s;s=1;scanf("%d",&n);for(;n>0;n--){s=n*s;}printf("%d",s);return 0;}25、输出时三位数的水仙花数#include"stdio.h"int main(){int i,j,k,sum,f;for(i=1;i<=9;i++)for(j=0;j<=9;j++)for(k=0;k<=9;k++){f=i*i*i+j*j*j+k*k*k;sum=100*i+10*j+k;if(sum<=999&&sum>=100&&sum==f)printf("%d ",sum);}return 0;}26、输出1000之内的所有完数#include"stdio.h"int main(){int n,i,sum;for(n=1;n<1000;n++){sum=0;for(i=1;i<=n/2;i++){if(n%i==0)sum=sum+i;}if(sum==n){printf("%d its factors are ",sum);for(i=1;i<=n/2;i++)if(n%i==0)printf("%d,",i);printf("\n");}}return 0;}27、将一个二维数组的行和列互换#include<stdio.h>int main(){int a[6][6],b[6][6];int i,j;printf("enter the array a:\n");for(i=0;i<6;i++)for(j=0;j<6;j++){scanf("%d",&a[i][j]);}for(i=0;i<6;i++)for(j=0;j<6;j++){b[i][j]=a[j][i];}printf("array b:\n");for(i=0;i<6;i++)for(j=0;j<6;j++){if(j%5==0)printf("\n");printf("%d ",b[i][j]);}return 0;}28、用*输出一个菱形#include"stdio.h"int main(){int i,j,k;for(i=1,k=4;i<=4;i++,k--){for(j=1;j<=3+i;j++){if(j<k)printf(" ");else printf("*");}printf("\n");}for(i=1,k=2;i<=4;k++,i++){for(j=1;j<=7-i;j++){if(j<k)printf(" ");else printf("*");}printf("\n");}return 0;}#include"stdio.h"int main(){int i,j,m,n;scanf("%d",&m);n=m-1;for(i=1;i<=m;i++){n++;for(j=1;j<=n;j++)if(j<i)printf(" ");else printf("* ");printf("\n");}printf("\n");return 0;}29、先输入几个数排好序再输入一个数将他插入排好序的数中#include"stdio.h"int main(){int a[100]={0};int r,i,j,m,n;for(r=0;r<100;r++){if(r==0){scanf("%d",&m);for(i=0;i<m;i++)scanf("%d",&a[i]);}if(r>0){scanf("%d",&a[m]);m++;}for(i=0;i<m-1;i++)for(j=0;j<m-i-1;j++)if(a[j]>a[j+1]){n=a[j];a[j]=a[j+1];a[j+1]=n;}for(i=0;i<m;i++)printf("%d ",a[i]);printf("\n");}return 0;}30、输出杨辉三角#include<stdio.h>int main(int argc, char* argv[]) {void f(int a[10][10]);int b[10][10]={0};f(b);return 0;}void f(int a[10][10]){int i,j;for(i=0;i<10;i++){a[i][0]=1;a[i][i]=1;for(i=2;i<10;i++){for(j=1;j<i;j++)a[i][j]=a[i-1][j-1]+a[i-1][j];}for(i=0;i<10;i++){for(j=0;j<10;j++){if(a[i][j]==0)continue;else printf("%5d",a[i][j]);}printf("\n");}}#include<stdio.h>int main(){int i,j,k=10;int a[10][10];printf("\n\n\n\n\n\n");for(i=0;i<10;i++)for(j=0;j<=i;j++){if(j==0||j==i)a[i][j]=1;a[i][j]=a[i-1][j-1]+a[i-1][j]; }for(i=0;i<10;i++){for(j=0;j<=i;j++)printf("%5d",a[i][j]);k--;for(j=k-1;j>=0;j--)printf("%5d",a[k][j]);printf("\n\n");}}#include<stdio.h>int main(){int i,j;int a[10][10];printf("\n\n\n");for(i=0;i<10;i++)for(j=0;j<=i;j++){if(j==0||j==i)a[i][j]=1;elsea[i][j]=a[i-1][j-1]+a[i-1][j];}for(i=0;i<10;i++){for(j=0;j<=10-i;j++)printf("%2c",' ');for(j=0;j<=i;j++)printf("%4d",a[i][j]);printf("\n");}for(i=8;i>=0;i--){for(j=0;j<=10-i;j++)printf("%2c",' ');for(j=0;j<=i;j++)printf("%4d",a[i][j]);printf("\n");}return 0;}#include<stdio.h>int b(x,y)int x,y;{int p,q;int a[10][10];for(p=0;p<10;p++){a[p][0]=1;a[p][p]=1;}for(p=2;p<10;p++)for(q=1;q<p;q++)a[p][q]=a[p-1][q-1]+a[p-1][q];return(a[x][y]);}int main(){int i,j,s=10;for (i=0;i<10;i++){for(j=0;j<10-i;j++)printf("%2c",' ');for(j=0;j<=i;j++)printf("%5d",b(i,j));s--;for(j=s;j>=0;j--)printf("%5d",b(s,j));printf("\n\n");}return 0;}31、定义使用结构体变量#include"stdio.h"int main(){struct Student{int number;char name[20];char sex;char addr[20];char wife[20];}a={10101,"li xiaolong",'M',"gansu longxi","zuo junyan"};printf("number:%d\nname:%s\nsex:%c\naddr:%s\nwife:%s",a.number,a. name,a.sex,a.addr,a.wife);return 0;}#include"stdio.h"int main(){struct Student{int number;char name[20];float score;}studenta,studentb;scanf("%d%s%f",&studenta.number,,&studenta.score);scanf("%d%s%f",&studentb.number,,&studentb.score);printf("The high score is:\n");if(studenta.score>studentb.score)printf("%d %s %6.2f",studenta.number,,studenta.score );if(studenta.score<studentb.score)printf("%d %s %6.2f",studentb.number,,studentb.score );elseprintf("%d %s %6.2f\n",studenta.number,,studenta.sco re);printf("%d %s %6.2f",studentb.number,,studentb.score );return 0;}/* Note:Your choice is C IDE */#include"stdio.h"#include"string.h"struct Person{char name[20];int count;}leader[3]={"li",0,"zhang",0,"wang",0};int main(){int i,j;char leader_name[20];for(i=0;i<10;i++){scanf("%s",leader_name);for(j=0;j<3;j++)if(strcmp(leader_name,leader[j].name)==0)leader[j].count++;}printf("\nResult:\n");for(i=0;i<3;i++)printf("%5s:%d\n",leader[i].name,leader[i].count);return 0;}/* Note:Your choice is C IDE */#include"stdio.h"struct Student{int number;char name[30];float score;};int main(){struct Studentstudent[5]={10101,"zhang",78,10102,"wang",98.5,10103,"li",86,10104,"l ing",73.5,10105,"sun",100};struct Student temp;const int n=5;int i,j,k;printf("the order is;\n");for(i=0;i<n-1;i++){k=i;for(j=i+1;j<n;j++)if(student[j].score<student[k].score)k=j;temp=student[k];student[k]=student[i];student[i]=temp;}for(i=0;i<n;i++)printf("%8d%8s %6.2f\n",student[i].number,student[i].name,student [i].score);return 0;}32、用指针处理链表/* Note:Your choice is C IDE */#include"stdio.h"struct Student{int number;float score;struct Student*next;};int main(){struct Student a,b,c,*head,*p;a.number=10101;a.score=78;b.number=10102;b.score=98.5;c.number=10103;c.score=86;head=&a;a.next=&b;b.next=&c;c.next=NULL;p=head;do{printf("%8d %6.2f\n",p->number,p->score);p=p->next;}while(p!=NULL);return 0;}#include"stdio.h"#include"stdlib.h"#define LNE sizeof(struct Student)struct Student{long number;float score;struct Student*next;};int n;struct Student*creat(void){struct Student*head;struct Student*p1,*p2;n=0;p1=p2=(struct Student*)malloc(LNE);scanf("%ld%f",&p1->number,&p2->score);head=NULL;while(p1->number!=0){n=n+1;if(n==1)head=p1;else p2->next=p1;p2=p1;p1=(struct Student*)malloc(LNE);scanf("%ld%f",&p1->number,&p2->score);}p2->next=NULL;return(head);}int main(){struct Student*pt;pt=creat();printf("\nnumber:%ld\nscore:%5.1lf\n",pt->number,pt->score);return 0;}#include<stdio.h>#include<malloc.h>#define LEN sizeof(struct Student)struct Student{long number;float score;struct Student *next;};int n;struct Student *creat(){struct Student *head;struct Student *p1,*p2;n=0;p1=p2=(struct Student*)malloc(LEN);scanf("%ld,%f",&p1->number,&p1->score);head=NULL;while(p1->number!=0){n=n+1;if(n==1)head=p1;else p2->next=p1;p2=p1;p1=(struct Student*)malloc(LEN);scanf("%ld,%f",&p1->number,&p1->score);}p2->next=NULL;return head;}void print(struct Student *head){struct Student *p;printf("\nnow,These %d records are:\n",n); p=head;if(head!=NULL)do{printf("%ld%5.1f\n",p->number,p->score); p=p->next;}while(p!=NULL);}void main(){struct Student *head; head=creat();print(head);}。