C语言作业

菱形#include<stdio.h>int main(){int i,j;for(i=1;i<=4;i++){for(j=1;j<=4-i;j++) printf(" ");for(j=1;j<=2*i-1;j++)printf("*"); printf("\n");}for(i=1;i<=3;i++){for(j=1;j<=i;j++)printf(" ");for(j=1;j<=7-2*i;j++)printf("*"); printf("\n");}return 0;}三角形#include<stdio.h>int main(){int i,j;for(i=1;i<=5;i++){for(j=1;j<=24-i;j++) printf(" ");for(j=1;j<=2*i-1;j++)printf("*"); printf("\n");}return 0;}乘法口诀#include<stdio.h>int main(){int i,j;for(i=1;i<=9;i++){for(j=1;j<=9;j++)if(j<=i)printf("%d*%d=%d ",j,i,i*j); printf("\n");}return 0;}统计大写字母#include<stdio.h>#include<ctype.h>int main(){char c;int num[26]={0},i;while((c=getchar())!='#')if(isupper(c))num[c-'A']+=1;for(i=0;i<26;i++)if(num[i])printf("%c:%d\n",i+'A',num[i]);return 0;}最小公倍数，最大公约数#include<stdio.h>int main(){int m,n,p,r,t;scanf("%d,%d",&n,&m);if(n<m){t=n;n=m;m=t;}p=n*m;while(m!=0){r=n%m;n=m;m=r;}printf("%d,%d,%d\n",n,p/n); return 0;}n位a相加#include<stdio.h>int main(){int i,t,s,a,n;a=2;t=0;s=0;scanf("%d",&n);for(i=1;i<=n;i++){t=t+a;s=s+t;a=a*10;}printf("s=%d\n",s);return 0;}求和#include<stdio.h>int main(){double a,b,c,i,j,k;a=0;b=0;c=0;for(i=1;i<=100;i++)a=a+i;for(j=1;j<=50;j++)b=b+j*j;for(k=1;k<=10;k++)c=c+1/k;printf("s=%10.6f\n",a+b+c);return 0;}球落地#include<stdio.h>int main(){double h,n,s;s=100;h=50;for(n=2;n<=10;n++){s=s+2*h;h=h/2;}printf("%f\n%f\n",s,h);return 0;}猴子吃桃#include<stdio.h>int main(){int n,k;k=1;for(n=1;n<=9;n++){k=(k+1)*2;}printf("%d\n",k);return 0;}计算天数#include<stdio.h>int main(){int year,month,day,s;scanf("%d %d %d",&year,&month,&day);switch(month){case 1: s=0;break;case 2: s=31;break;case 3: s=59;break;case 4: s=90;break;case 5: s=120;break;case 6: s=151;break;case 7: s=181;break;case 8: s=212;break;case 9: s=243;break;case 10: s=273;break;case 11: s=304;break;case 12: s=334;break;}if(year%400==0||(year%4==0&&year%100!=0)) {if(month<=2)printf("%d\n",s+day);elseprintf("%d\n",s+day+1);}elseprintf("%d\n",s+day);return 0;}杨辉三角形#include<stdio.h>int main(){int a[10][10];int i,j;for(i=0;i<10;i++){a[i][i]=1;a[i][0]=1;}for(i=2;i<10;i++){for(j=1;j<=i-1;j++)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("%6d",a[i][j]);printf("\n");}return 0;}矩阵对角线和#include<stdio.h>int main(){int a[3][3];int i,j,s=0;for(i=0;i<3;i++){for(j=0;j<3;j++)scanf("%d",&a[i][j]);}for(i=0;i<3;i++){s=s+a[i][i];}printf("%d\n",s); return 0;}倒叙数组#include<stdio.h>int main(){int a[5];int i,j;for(i=0;i<5;i++){scanf("%d",&a[i]);}for(i=0;i<3;i++){j=a[i];a[i]=a[5-i-1];a[5-i-1]=j;}for(i=0;i<5;i++){printf("%d ",a[i]);}return 0;}插数排列#include<stdio.h>int main(){int a[6]={1,3,5,7,9};int i,j,k,x,t;printf("x=");scanf("%d",&x);if(x>a[4])a[5]=x;elsefor(i=0;i<5;i++){if(a[i]>x){t=a[i];a[i]=x;for(j=i+1;j<6;j++){k=a[j];a[j]=t;t=k;}break;}}for(i=0;i<6;i++)printf("%d ",a[i]); return 0;}单词相加#include<stdio.h>int main(){char a[100],b[100];int i=0,j=0;scanf("%s",a);scanf("%s",b);while(a[i]!='\0')i++;while(b[j]!='\0')a[i++]=b[j++];printf("%s",a);return 0;}统计字母#include<stdio.h>int main(){char text[3][10];int i,j,A,a,n,s,o;A=0;a=0;n=0;s=0;o=0;for(i=0;i<3;i++){gets(text[i]);for(j=0;j<80&&text[i][j]!='\0';j++){if(text[i][j]>='A'&&text[i][j]<='Z')A++;else if(text[i][j]>='a'&&text[i][j]<='z')a++;else if(text[i][j]>='0'&&text[i][j]<='9')n++;else if(text[i][j]==' ')s++;elseo++;}}printf("´óд×Öĸ:%d\nСд×Öĸ:%d\nÊý×Ö:%d\n¿Õ¸ñ:%d\nÆäËû:%d\n",A,a,n,s,o); return 0;}字符串差#include<stdio.h>{int i=0,s;char a[100],b[100];gets(a);gets(b);while((a[i]==b[i])&&(a[i]!='\0')) i++;if(a[i]=='\0'&&b[i]=='\0')s=0;elses=a[i]-b[i];printf("%d\n",s);return 0;}字符串倒输出#include<stdio.h>int main(){char a[100];int i=0,j,t;gets(a);while(a[i]!='\0')i++;for(j=0;j<i/2;j++){t=a[j];a[j]=a[i-j-1];a[i-j-1]=t;}printf("%s\n",a);return 0;}函数字符反输出#include<stdio.h>#include<string.h>int main(){void fun(char a[]);char a[100];scanf("%s",a);printf("%s\n",a);return 0;}void fun(char a[]){char t;int i,j;for(i=0,j=strlen(a);i<(strlen(a)/2);i++,j--){t=a[i];a[i]=a[j-1];a[j-1]=t;}}数列找大小#include<stdio.h>int main(){int a[5][5]={{1,2,3,4,5},{6,7,8,9,10},{11,12,13,14,15},{1,2,3,4,5},{1,2,3,4,5}};int i,j,maxrow=0,maxcloum=0,minrow=0,mincloum=0;float max,min,sum;max=a[0][0];min=a[0][0];sum=0;for(i=0;i<=4;i++){for(j=0;j<=4;j++)if(a[i][j]>max){max=a[i][j];maxrow=i;maxcloum=j;}}printf("max=%.6f,maxrow=%d,maxcloum=%d\n",max,maxrow,maxcloum);for(i=0;i<=4;i++){for(j=0;j<=4;j++)if(a[i][j]<min){min=a[i][j];minrow=i;mincloum=j;}}printf("min=%.6f,minrow=%d,mincloum=%d\n",min,minrow,mincloum);for(i=0;i<=4;i++){for(j=0;j<=4;j++)if(i+j<=4){sum=sum+a[i][j];}}printf("sum=%.6f\n",sum);return 0;}解二元一次方程#include<stdio.h>#include<math.h>float x1,x2,p,q,z;int main(){void app(float,float);void bpp(float,float);void cpp(float,float);float a,b,c;printf("a,b,c:");scanf("%f,%f,%f",&a,&b,&c);printf("%fx^2+%fx+%f=0\n",a,b,c);z=b*b-4*a*c;if(z>0){app(a,b);printf("x1=%f\nx2=%f\n",x1,x2);}else if(z==0){bpp(a,b);printf("x1=%f\nx2=%f\n",x1,x2);}{cpp(a,b);printf("x1=%f+%fi\nx2=%f+%fi\n",p,q,p,q); }return 0;}void app(float a,float b){x1=(-b+sqrt(z))/(2*a);x2=(-b-sqrt(z))/(2*a);}void bpp(float a,float b){x1=x2=(-b)/(2*a);}void cpp(float a,float b){p=-b/(2*a);q=sqrt(-z)/(2*a);}函数判断素数#include<stdio.h>int main(){int fun(int);int a;scanf("%d",&a);if(fun(a))printf("%d is a prime\n",a);elseprintf("%d is not a prime\n",a); return 0;}int fun(int a){int i,j=1;for(i=2;i<a/2&&j==1;i++)if(a%i==0)return(j);}插入空格#include<stdio.h>#include<string.h>int main(){void fun(char []);char a[100];scanf("%s",a);fun(a);return 0;}void fun(char a[]){int i;for(i=strlen(a);i>0;i--){a[2*i]=a[i];a[2*i-1]=' ';}printf("%s\n",a);}编号#include<stdio.h>#include<string.h>int main(){void A(int[],char name[][8]);void B(int[],char name[][8]);int num[10];char name[10][8];A(num,name);B(num,name);return 0;}void A(int num[],char name[10][8]) {int i;for(i=0;i<10;i++){printf("input name:");getchar();gets(name[i]);printf("input NO.");scanf("%d",&num[i]);}}void B(int num[],char name[10][8]) {int i,j,min,t;char a[8];for(i=0;i<9;i++){min=i;for(j=i;j<10;j++)if(num[min]>num[j])min=j;t=num[i];strcpy(a,name[i]);num[i]=num[min];strcpy(name[i],name[min]);num[min]=t;strcpy(name[min],a);}for(i=0;i<10;i++)printf("\n%5d%10s\n",num[i],name[i]); }冒泡法排字母#include <stdio.h>int main(){int i,j,t;char a[10];for(i=0;i<10;i++){scanf("%c",&a[i]);}for(j=0;j<9;j++)for(i=0;i<9-j;i++)if(a[i]>a[i+1]){t=a[i];a[i]=a[i+1];a[i+1]=t;}for(i=0;i<10;i++)printf("%c",a[i]);return 0;}指针排序#include<stdio.h>int main(){int t,a,b,c,*p1,*p2,*p3;scanf("%d %d %d",&a,&b,&c);p2=&b;p3=&c;if(*p1<*p2){t=*p1;*p1=*p2;*p2=t;}if(*p1<*p3){t=*p1;*p1=*p3;*p3=t;}if(*p2<*p3){t=*p2;*p2=*p3;*p3=t;}printf("%d %d %d\n",c,b,a);}。