c语言程序设计实例.doc

加减乘除的C程序：#includeint main() double a,b;char c;scanf(%lf%c%lf,&a,&c,&b);switch(c)case +:printf(%lf%c%lf=%lf,a,c,b,a+b);break; case -:printf(%lf%c%lf=%lf,a,c,b,a-b);break; case *:printf(%lf%c%lf=%lf,a,c,b,a*b);break; case /:printf(%lf%c%lf=%lf,a,c,b,a/b);break; default:printf(error);break;printf(n);return 0;三个数，输出最大的数的C程序：#includeint main()int a,b,c;printf(please enter integers:);scanf(%d%d%d,&a,&b,&c);if(ab)if(bc)printf(max=%dn,c);else printf(max=%dn,b);else if(ac) printf(max=%dn,c); else printf(max=%dn,a); return 0;死循环：#includeint main()int n;for(n=1;n=1;n+)if(n%3!=0)printf( %d,n);return 0;输出 * 的C程序： very good! *#includeint main()printf(*); printf(n); printf( very good!n );printf(*); printf(n);return 0;ax2+bx+c=0的c程序：#include#include/程序中要调用求平方根函数sqrt/int main() double a,b,c,disc,x1,x2,p,q,r; scanf(%lf%lf%lf,&a,&b,&c); disc=b*b-4*a*c; if(a!=0) if(disc0) printf(This equation hasnt real rootsn,x1,x2); else p=-b/(2.0*a); q=sqrt(disc)/(2.0*a); x1=p+q; x2=p-q; printf(real roots:nx1=%7.2fnx2=%7.2fn,x1,x2); if(a=0)r=c/b; x1=r;x2=r; printf(%lf%lfn,x1,x2); return 0;Sinx在0，pi的积分：#include#includeusing namespace std;int main() double S(0); for(double i=0.00;i3.15;i+=0.01) S+=sin(i)*0.01; coutS0,y=1;x0,y=-1c程序：#includeint main()double x;int y;printf(plesae enter x:);scanf(%lf,&x);y=0;if(x=0) if(x0)y=1; else y=-1;printf(x=%lf,y=%d,x,y);printf(n);return 0;求pi的近似值：#include#includeint main() int sign; double n,term,pi; term=1.0,pi=0.0;n=1.0;sign=1; while(fabs(term)1e-6) pi=pi+term; n=n+2; sign=-sign; term=sign/n; pi=pi*4; printf(pi=%10.8fn,pi); return 0;#includeint main()int d;double score;printf(You score:); scanf(%lf,&score); d=score/10;switch(d)case 10 :case 9:printf(等级为At);printf(%4.1lfn,score);break; case 8:printf(等级为Bn);break; case 7:printf(等级为Cn);break; case 6:printf(等级为Dn);break;case 5:case 4:case 3:case 2:case 1:case 0:printf(等级为En);break;return 0;输入一串字符，计算英文，数字，空格及其它的个数：#includeint main()char c; int i=0,j=0,k=0,l=0; while(c=getchar()!=n) if(c=65&c=97&c=48&c=57) j+; else if(c=32) k+; else l+; printf(i=%d,j=%d,k=%d,l=%dn,i,j,k,l); return 0;求2+22+222+2222+（n个2）的和：#include#includeint main()int i=1,n,sum=0,s=2;printf(enter n:);scanf(%d,&n);for(;i=n;i+)sum=sum+s;s=s+2*pow(10,i);printf(%dn,sum);return 0;求1！+2！+3！+.+n!的和：#includeint main() int n,i,t,sum=0; scanf(%d,&n); t=1; for(i=1;i=n;i+) t=t*i; sum+=t; printf(%dn,sum);2/1, 3/2 ,5/3,8/5,13/8,21/13,.求前20项之和：#includeint main()int i,v,t;double s,x=1,y=2,sum=0;for(i=1;i=20;i+)s=y/x;sum+=s;t=y;v=x;y=t+v;x=t;printf(%fn,sum);输入a,b，有大到小排列：#includeint main()int a,b,t;scanf(%d%d,&a,&b);if(ab)t=a;a=b;b=t;printf(%dt%dn,a,b);return 0;/输出日历#include void printhead()/打印表头 printf( sum mon tue wed thu fri sat); printf(n);int year1(int year)/判断是否是闰年 if(year%4=0)&(year%100!=0)|(year%400=0) return 1; return 0;int printmonth(int day,int month,int year)/打印每个月的日历 int i,j,k,days; printf(%d月份,month);/ 打印是第几个月 printf(n); printhead(); /判断要打印的月的天数 if(month=2) if(year) days=29; else days=28; else if(month=4|month=6|month=9|month=11) days=30; else days=31; /打印每月第一行的空格，对齐星期几 for(i=0;iday;i+) printf( );/ 打印日历 for(k=1;k=days;k+) printf(%4d,k); if(k+day)%7=0)/每星期换行 printf(n); printf(n); return (k+day-1)%7); /返回下个月的第一天是星期几 int main()int year,month,R,day,next; printf(请输入你要打印的年份); scanf(%d,&year); do day=(year-1)*365+(year-1)/4-(year-1)/100+(year-1)/400+1)%7;/求所输入年份第一天是星期几 R=year1(year);/R为是否是闰年是为1，否则为0 for(month=1;month=12;month+) day=printmonth(day,month,R); printf(是否打印下一年，是输1否则输0); scanf(%d,&next); if(next=1) year+; while(next); return 0;/删除重复的数#include #define N 80#include #define N 80int fun(int a, int n) int i, j = 1, k = a0 ; for(i = 1 ; i n ; i+) if(k != ai) aj+=ai ; k = ai ; aj = 0 ; return j ;main() int aN=2,2,2,3,4,4,5,6,6,6,6,7,7,8,9,9,10,10,10,10,i,n=20; pri