C语言经典复习题.doc

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1、1.输入两个正整数，m和n，求其最大公约数和最小公倍数。#includevoidmain(){ inthcf(int,int);     /*函数声明*/ intlcd(int,int,int); /*函数声明*/ intu,v,h,l; printf("Pleaseｉｎｐｕｔtwonumbers:"); scanf("%d,%d",&u,&v); h=hcf(u,v); printf("H.C.F=%d",h); l=lcd(u,v,h); printf("L.C.D=%d",l);}inthcf(intu,intv){ intt,

2、r; if(v>u) {t=u;u=v;v=t;} while((r=u%v)!=0) {u=v;v=r;} return(v);}intlcd(intu,intv,inth){ return(u*v/h);}2.输入一行字符，分别统计出其中字母、空格、数字和其他字符的个数。#includeintletter,digit,space,others;voidmain(){ voidcount(char[]); chartext[80]; printf("Pleaseｉｎｐｕｔstring:"); gets(text); printf("stri

3、ng:"); puts(text); letter=0; digit=0; space=0; others=0; count(text); printf("letter:%d,digit:%d,space:%d,others:%d",letter,digit,space,others);}voidcount(charstr[]){ inti; for(i=0;str[i]!='';i++)  if((str[i]>='a'&&str[i]<='z')

4、

5、(str[i]>='A'&&str[i]<='Z'))   letter++;  elseif(st

6、r[i]>='0'&&str[i]<='9')   digit++;  elseif(str[i]==32)   space++;  else   others++;}3.输入一个正整数求出它是几位数；输出原数和位数。#includeintdigit;voidmain(){ voidcount(char[]); chartext[80]; printf("Pleaseｉｎｐｕｔnumbers:"); gets(text); printf("Numbers:"); puts(text); digit=0; count(text); prin

7、tf("digit:%d",digit);}voidcount(charstr[]){ inti; for(i=0;str[i]!='';i++)  if(str[i]>='0'&&str[i]<='9')   digit++;}4.输入一个正整数，输出原数并逆序打印出各位数字。#includevoidinvertLongInt(long);voidmain(){ unsignedlongiNumber; printf("Pleaseｉｎｐｕｔanumber:"); scanf("%ld",&iNumber); printf("The

8、ｉｎｐｕｔnumberis:%ld",iNumber); printf("Theinversenumberis:"); invertLongInt(iNumber);}voidinvertLongInt(longx){ if(x>=0&&x<=9)  printf("%d",x); else {  printf("%d",x%10);  invertLongInt(x/10); }}5.从键盘上输入若干学生的一门课成绩，统计并输出最高成绩和最低成绩及相应的序号，当输入负数时结束输入。6.从键盘上输入若干学生的一门课成绩，计算出平均分，当输入负数时结束输入。

9、将结果输出。7.求1!+2!+3!+……+20!，将结果输出。#includevoidmain(){ floats=0,t=1; intn; for(n=1;n<=20;n++) {  t=t*n;  s=s+t; } printf("1!+2!+3!+……+20!=%e",s);}8.打印以下图案：      *                     ***                    *****                   *******#includevoidmain(){ inti,j; prin

10、tf("T