C语言程序设计第三版谭浩强课后习题答案.doc

C语言程序设计第三版谭浩强课后习题答案完整版（完整版）
(文档可以直接使用，也可根据实际需要修改使用,可编辑 欢迎下载）
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**************************
Very Good!
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mian()
{printf("**************************");
printf("\n");
printf("Very Good!\n");
printf("\n");
printf("**************************");
}
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mian()
{int a,b,c,max;
printf("ÇëÊäÈëÈý¸öÊýa,b,c:\n");
scanf("%d,%d,%d",&a,&b,&c);
max=a;
if(max
max=c;
printf("×î´óÊýΪ£º"%d",max);
}
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main()
{char c£±='a',c£²='b',c3='c',c4='\£±0£±',c5='\£±£±6';
printf("a%cb%c\tc%c\tabc\n",c£±,c£²,c3);
printf("\t\b%c %c",c4,c5);
}

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3.7¡¡Òª½«"China"Òë³ÉÃÜÂ룬ÒëÂë¹æÂÉÊÇ£ºÓÃÔ­À´×ÖĸºóÃæµØµÚ4¸ö×Öĸ´úÌæÔ­À´µØ×Öĸ£®ÀýÈ磬×Öĸ"A"ºóÃæµÚ4¸ö×ÖĸÊÇ"E"£®"E"´úÌæ"A"¡£Òò´Ë£¬"China"Ó¦ÒëΪ"Glmre"¡£Çë±à£­³ÌÐò£¬Óø³³õÖµµØ·½·¨Ê¹cl¡¢c£²¡¢c3¡¢c4¡¢c5Îå¸ö±äÁ¿µØÖµ·Ö±ðΪ£¬'C'¡¢'h'¡¢'i'¡¢'n'¡¢'a'£¬¾­¹ýÔËË㣬ʹc£±¡¢c£²¡¢c3¡¢c4¡¢c5·Ö±ð±äΪ'G'¡¢'l'¡¢'m'¡¢'r'¡¢'e'£¬²¢Êä³ö¡£

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#include
main()
{ char c£±='C',c£²='h',c3='i',c4='n',c5='a';
c£±+=4;
c£²+=4;
c3+=4;
c4+=4;
c5+=4;
printf("ÃÜÂëÊÇ%c%c%c%c%c\n",c£±,c£²,c3,c4,c5);
}
ÔËÐнá¹û£º
ÃÜÂëÊÇGlmre
3.9ÇóÏÂÃæËãÊõ±í´ïʽµØÖµ¡£
£¨£±£©x+a%3*(int)(x+y)%£²/4
Éèx=£².5,a=7,y=4.7
£¨£²£©(float)(a+b)/£²+(int)x%(int)y
Éèa=£²,b=3,x=3.5,y=£².5
£¨£±£©£².5
£¨£²£©3.5
3.£±0д³ö³ÌÐòÔËÐеؽá¹û¡£
main()
{int i,j,m,n;
i=8;
j=£±0;
m=++i;
n=j++;
printf("%d,%d,%d,%d",i,j,m,n);
}

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9£¬£±£±£¬9£¬£±0
3.£±£² д³öÏÂÃæ±í´ïʽÔËËãºóaµØÖµ£¬ÉèÔ­À´a=£±£²¡£ÉèaºÍn¶¼ÒѶ¨ÒåΪÕûÐͱäÁ¿¡£
£¨£±£©a+=a £¨£²£© a-=£² £¨3£© a*=£²+3 £¨4£©a/=a+a
£¨5£© a%=(n%=£²)£¬nµØÖµµÈÓÚ5
£¨6£©a+=a-=a*=a
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(£±) £²4 (£²) £±0 (3) 60 (4) 0 (5) 0 (6) 0

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4£®4Èôa=3£¬b=4£¬c=5£¬x=£±.£²£¬y=£².4£¬z=-3.6£¬u=5£±£²74£¬n=£±£²8765£¬c£±='a'£¬c£²='b'¡£ÏëµÃµ½ÒÔÏÂÊä³ö¸ñʽºÍ½á¹û£¬Çëд³ö³ÌÐò£¨°üÀ¨¶¨Òå±äÁ¿ÀàÐͺÍÉè¼ÆÊä³ö£©¡£
a=_3_ _b=_4_ _c=_5
x=£±.£²00000,y=£².400000,z=-3.600000
x+y=_3.600_ _y+z=-£±.£²0_ _z+x=-£².40
c£±=¨@a¨@_or_97(ASCII)
c£²=¨@b¨@_or_98(ASCII)
main()
{int a=3,b=4,c=5;
long int u=5£±£²74,n=£±£²8765;
float x=£±.£²,y=£².4,z=3.6;
char c£±='a',c£²='b';
printf("a=%£²d b=%£²d c=%£²d\n",a,b,c);
printf("x=%f,y=%f,z=%f\n",x,y,z);
printf("x+y=%5.£²f y+z=%5.£²f z+x=%5.£²f\n",x+y,y+z,z+x);
printf("u=%6ld n=%9ld\n",u,n);
printf("%s %s %d%s\n","c£±='a'","or",c£±,"(ASCII)");
printf("%s %s %d%s\n","c£²='a'","or",c£²,"(ASCII)");
}

4£®7ÓÃscanfÏÂÃæµØº¯ÊýÊäÈëÊý¾Ý£¬Ê¹a=3£¬b=7£¬x=8.5£¬y=7£±.8£²£¬c£±=¨@A¨@£¬c£²=¨@a¨@£¬ÎÊÔÚ¼üÅÌÉÏÈçºÎÊäÈ룿
main()
{
int a£¬b£»float x£¬y£»char c£±c£²£»
scanf£¨"ad_b=%d"£¬&a£¬&b£©£»
scanf£¨"_x=%f_y=%e",&x£¬&y£©£»
scanf£¨"_c£±=%c_c£²=%c"£¬&c£±£¬&c£²£©£»
}
a=3_b=7
_x=8.5_y=7£±.8£²
_c£±=A_c£²=a

4£®8ÉèÔ²°ë¾¶r=£±.5£¬Ô²Öù¸ßh=3£¬ÇóÔ²Öܳ¤¡¢Ô²Ãæ»ý¡¢Ô²Çò±íÃæ»ý¡¢Ô²ÇòÌå»ý¡¢Ô²ÖùÌå»ý¡£ÓÃscanfÊäÈëÊý¾Ý£¬Êä³ö¼ÆËã½á¹û£¬Êä³öʱҪÇóÎÄ×Ö˵Ã÷£¬È¡Ð¡ÊýµãºóÁ½Î»Êý×Ö¡£Çë±à³ÌÐò¡£

main()
{float r,h,C£±,Sa,Sb,Va,Vb;
scanf("%f,%f",&r,&h);
C£±=£²*3.£±4*r;
Sa=3.£±4*r*r;
Sb=4*Sa;
Va=4*3.£±4*r*r*r/3;
Vb=Sa*h;
printf("C£±=%.£²f\n",C£±);
printf("Sa=%.£²f\nSb=%.£²f\nVa=%.£²f\nVb=%.£²f\n",Sa,Sb,Va,Vb);
}
4£®9ÊäÈ룭¸ö»ªÊÏζȣ¬ÒªÇóÊä³öÉãÊÏζȡ£¹«Ê½Îª
c=5(F-3£²)/9
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main()
{float F,c;
scanf("%f",&F);
c=5*(F-3£²)/9;
printf("c=%.£²f",c);
}

4£®£±0±à³ÌÐò£¬ÓÃgetcharº¯Êý¶ÁÈëÁ½¸ö×Ö·û¸øc£±¡¢c£²£¬È»ºó·Ö±ðÓú¯ÊýºÍº¯ÊýÊä³öÕâÁ½¸ö×Ö·û¡£²¢Ë¼¿¼ÒÔÏÂÎÊÌ⣺£¨£±£©±äÁ¿c£±¡¢c£²Ó¦¶¨ÒåΪ×Ö·ûÐÍ»òÕûÐΣ¿ÒÖ¶þÕß½Ô¿É£¿£¨£²£©ÒªÇóÊä³öc£±ºÍc£²ÖµµØASCIIÂ룬ӦÈçºÎ´¦Àí£¿ÓÃputcharº¯Êý»¹ÊÇprintfº¯Êý£¿£¨£³£©ÕûÐαäÁ¿Óë×Ö·û±äÁ¿ÊÇ·ñÔÚÈκÎÇé¿ö϶¼¿ÉÒÔ»¥Ïà´úÌ棿È磺
char¡¡c£±£¬c£²£»
Óë
int¡¡c£±£¬c£²£»
ÊÇ·ñÎÞÌõ¼þµØµÈ¼Û£¿
#include"stdio.h"
main()
{char c£±,c£²;
c£±=getchar();c£²=getchar();
putchar(c£±);putchar('\n');putchar(c£²);putchar('\n');
}

#include"stdio.h"
main()
{char c£±,c£²;
c£±=getchar();c£²=getchar();
printf("c£±=%d c£²=%d\n",c£±,c£²);
printf("c£±=%c c£²=%c\n",c£±,c£²);
}

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5.£² CÓïÑÔÖÐÈçºÎ±íʾ"Õæ"ºÍ"¼Ù"£¿ÏµÍ³ÈçºÎÅжϣ­¸öÁ¿µØ"Õæ"ºÍ"¼Ù"£¿

½â£ºÉèÓУ­¸öÂß¼­±í´ïʽ£¬ÈôÆä½á¹ûΪ"Õæ"£¬ÔòÒÔ£±±íʾ£»ÈôÆä½á¹ûΪ"¼Ù"£¬ÔòÒÔ0±íʾ¡£µ«ÊÇÅжϣ­¸öÂß¼­Á¿µØֵʱ£¬ÒÔ0´ú±í"Õæ"£¬ÒÔ·Ç0´ú±í"¼Ù"¡£ÀýÈç3&&5µØֵΪ"Õæ"£¬ÏµÍ³¸ø³ö3&&5µØֵΪ£±¡£

5.3 д³öÏÂÃæ¸÷Âß¼­±í´ïʽµØÖµ¡£Éèa=3£¬b=4£¬c=5¡£
(£±) a+b>c&&b==c
(£²) a||b+c&&b-c
(3) !(a>b)&&!c||£±
(4) !(x=a)&&(y=b)&&0
(5) !(a+b)+c-£±&&b+c/£²

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(£±) 0
(£²) £±
(3) £±
(4) 0
(5) £±

5.4 ÓÐ3¸öÕûÊýa¡¢b¡¢c£¬ÓɼüÅÌÊäÈ룬Êä³öÆäÖÐ×î´óµØÊý¡£

½â£º
·½·¨£­
#include
main()
{ int a,b,c;
printf("ÇëÊäÈë3¸öÕûÊý£º");
scanf("%d,%d,%d",&a,&b,&c);
if(a½£¬¿ÉÒÔʹ³ÌÐò¸ü¼Ó¼òÃ÷¡¢ÇåÎú¡£
³ÌÐòÈçÏ£º
#include
main()
{ int a,b,c,temp,max;
printf("ÇëÊäÈë3¸öÕûÊý£º");
scanf("%d,%d,%d",&a,&b,&c);
temp=(a>b)?a:b; /* ½«aºÍbÖеشóÕß´æÈËtempÖÐ */
max=(temp>c)?temp:c; /* ½«aºÍbÖеشóÕßÓëc±È½Ï£¬È¡×î´óÕß*/
printf("3¸öÕûÊýµØ×î´óÊýÊÇ%d\n",max);
}

5.5 ÓУ­º¯Êý£º

д£­³ÌÐò£¬ÊäÈëxÖµ£¬Êä³öyÖµ¡£
½â£º
#include
main()
{int x,y;
printf("ÊäÈëx£º");
scanf("%d",&x);
if(x<£±) /* x<£± */
{ y=x;
printf("x=%3d, y=x=%d\n",x,y);
}
else if (x<£±0)/* £±¡Üx-£±0 */
{ y=£²*x-£±;
printf("x=%3d, y=£²*x-£±=%d\n",x,y);
}
else /* x¡Ý£±0 */
{ y=3*x-£±£±;
printf("x=%3d, y=3*x-£±£±=%d\n",x,y);
}
}

5.6 ¸ø£­¸ö°Ù·ÖÖƳɼ¨£¬ÒªÇóÊä³öµÈ¼¶'A'¡¢'B'¡¢'C'¡¢'D'¡¢'E'¡£90·ÖÒÔÉÏΪ'A'£¬80~90·ÖΪ'B'£¬70~79·ÖΪ'C'£¬60·ÖÒÔÏÂΪ'D'¡£
½â£º
³ÌÐòÈçÏ£º
#include
main()
{ float score;
char grade;
printf("ÇëÊäÈëѧÉú³É¼¨£º");
scanf("%f",&score);
while(score>£±00||(score<0)
{ printf("\nÊäÈëÓÐÎó,ÇëÖØÐÂÊäÈ룺");
scanf("%f",&score);
}
switch((int)(score/£±0))
{ case £±0:
case 9: grade'A';break;
case 8: grade='B';break;
case 7: grade='C';break;
case 6: grade='D';break;
case 5:
case 4:
case 3:
case £²:
case £±:
case 0: grade='E';
}
printf("³É¼¨ÊÇ%5.£±f£¬ÏàÓ¦µØµÈ¼¶ÊÇ%c¡£\n",score,grade);
}

˵Ã÷£º¶ÔÊäÈëµØÊý¾Ý½øÐмì²é£¬ÈçСÓÚ0»ò´óÓÚ£±00£¬ÒªÇóÖØÐÂÊäÈë¡£(int)(score/£±0)µØ×÷ÓÃÊǽ« (score/£±0) µØÖµ½øÐÐÇ¿ÖÆÀàÐÍת»»£¬µÃµ½£­¸öÕûÐÍÖµ¡£

5.7 ¸ø¶¨£­¸ö²»¶àÓÚ5λµØÕýÕûÊý£¬ÒªÇ󣺢٠ÇóËüÊǼ¸Î»Êý£»¢Ú ·Ö±ð´òÓ¡³öÿ£­Î»Êý×Ö£»¢Û °´ÄæÐò´òÓ¡³ö¸÷λÊý×Ö¡£ÀýÈçÔ­ÊýΪ3£²£±£¬Ó¦Êä³ö£±£²3¡£

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#include
main()
{ long int num;
int indiv,ten,hundred,thousand,ten_thousand,place;
/*·Ö±ð´ú±í¸öλ¡¢Ê®Î»¡¢°Ùλ¡¢Ç§Î»¡¢ÍòλºÍλÊý*/
printf("ÇëÊäÈ룭¸öÕûÊý£¨0~99999£©£º");
scanf("%ld",&num);
if (num>9999) place=5;
else if(num>999) place=4;
else if(num>99) place=3;
else if(num>9) place=£²;
else place=£±;
printf("place =%d\n", place);
ten_thousand=num/£±0000;
thousand=num/£±000%£±0;
hundred=num/£±00%£±0;
ten=num%£±00/£±0;
indiv=num%£±0;
switch(place)
{ case 5: printf("%d,%d,%d,%d,%d",ten_thousand,thousand,hundred,ten,indiv);
printf("\n·´ÐòÊý×ÖΪ£»");
printf("%d%d%d%d%d\n",indiv,ten,hundred,thousand,ten_thousand);
break;
case 4: printf("%d,%d,%d,%d",thousand,hundred,ten,indiv);
printf("\n·´ÐòÊý×ÖΪ£º");
printf("%d%d%d%d\n",indiv,ten,hundred,thousand);
break;
case 3: printf("%d,%d,%d",hundred,ten,indiv);
printf("\n·´ÐòÊý×ÖΪ£º");
printf("%d%d%d\n",indiv,ten,hundred);
break;
case £²: printf("%d,%d",ten,indiv);
printf("\n·´ÐòÊý×ÖΪ£º");
printf("%d%d\n",indiv,ten);
break;
case £±: printf("%d",indiv);
printf("\n·´ÐòÊý×ÖΪ£º");
printf("%d\n",indiv);
break;
}
}

5.8 ÆóÒµ·¢·ÅµØ½±½ð¸ù¾ÝÀûÈóÌá³É¡£ÀûÈóIµÍÓÚ»òµÈÓÚ£±0ÍòԪʱ£¬½±½ð¿ÉÌá³É£±0% £»ÀûÈó¸ßÓÚ£±0ÍòÔª£¬µÍÓÚ£²0ÍòÔª£¨£±00000Ìá³É£¬¸ßÓÚ£±0ÍòÔªµØ²¿·Ö£¬¿ÉÌá³É7.5% £»£²00000£±000000ʱ£¬³¬¹ý£±00ÍòÔªµØ²¿·Ö°´£±%Ìá³É¡£´Ó¼üÅÌÊäÈëµ±ÔÂÀûÈóI£¬ÇóÓ¦·¢·Å½±½ð×ÜÊý¡£ÒªÇó£º(£±)ÓÃifÓï¾ä±à³ÌÐò£»(£²)ÓÃswitchÓï¾ä±à³ÌÐò¡£

½â£º¼ÆËãÀûÈóʱ£¬ÒªÌرð×¢ÒⲻͬÀûÈóµØ²»Í¬Ìá³É±ÈÀý¡£ÀýÈ磬ÀûÈóΪ£±5ÍòÔª£¬ÆäÖÐÓУ±0ÍòÔª°´£±0%µØ±ÈÀýÌá³É£¬ÁíÍâ5ÍòÔªÔò°´7.5%Ìá³É¡£
(£±) ÓÃifÓï¾ä±à³ÌÐò¡£

#include
main()
{ long i;
float bonus,bon£±,bon£²,bon4,bon6,bon£±0;
bon£±=£±00000*0.£±; /*ÀûÈóΪ£±0ÍòԪʱµØ½±½ð*/
bon£²=bon£±+£±00000*0.075; /*ÀûÈóΪ£²0ÍòԪʱµØ½±½ð*/
bon4=bon£²+£²00000*0.05; /*ÀûÈóΪ40ÍòԪʱµØ½±½ð*/
bon6=bon4+£²00000*0.03; /*ÀûÈóΪ60ÍòԪʱµØ½±½ð*/
bon£±0=bon6+400000*0.0£±5; /*ÀûÈóΪ£±00ÍòԪʱµØ½±½ð*/
printf("ÇëÊäÈëÀûÈói£º");
scanf("%ld",&i);
if(i<=£±00000)
bonus=i*0.£±; /*ÀûÈóÔÚ£±0ÍòÔªÒÔÄÚ°´0.£±Ìá³É½±½ð*/
else if(i<=£²00000)
bonus=bon£±+(i-£±00000)*0.075; /*ÀûÈóÔÚ£±0ÍòÖÁ£²0ÍòԪʱµØ½±½ð*/
else if(i<=400000)
bonus=bon£²+(i-£²00000)*0.05; /*ÀûÈóÔÚ£²0ÍòÖÁ40ÍòԪʱµØ½±½ð*/
else if(i<=600000)
bonus=bon4+(i-400000)*0.03; /*ÀûÈóÔÚ40ÍòÖÁ60ÍòԪʱµØ½±½ð*/
else if(i<=£±000000)
bonus=bon6+(i-600000)*0.0£±5; /*ÀûÈóÔÚ60ÍòÖÁ£±00ÍòԪʱµØ½±½ð*/
else
bonus=bon£±0+(i-£±000000)*0.0£±; /*ÀûÈóÔÚ£±00ÍòÔªÒÔÉÏʱµØ½±½ð*/
printf("½±½ðÊÇ%£±0.£²f\n",bonus);
}

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(£²) ÓÃswitchÓï¾ä±à³ÌÐò¡£
ÊäÈëÀûÈói£¬È·¶¨ÏàÓ¦µØÌá³ÉµÈ¼¶branch

¸ù¾ÝbranchÈ·¶¨½±½ðÖµ
0 ½±½ð=i*0.£±
£± ½±½ð=bon£±+(i-£±05)*0.075
£² ½±½ð=bon£²+(i-£²*£±05)*0.05
3
4 ½±½ð=bon4+(i-4*£±05)*0.03
5
6 ½±½ð=bon6+(i-6*£±05)*0.0£±5
7
8
9
£±0 ½±½ð=bon£±0+(i-£±06)*0.0£±
Êä³ö½±½ð

#include
main()
{ long i;
float bonus, bon£±, bon£², bon4, bon6, bon£±0;
int c;
bon£±=£±00000*0.£±;
bon£²=bon£±+£±00000*0.075;
bon4=bon£²+£²00000*0.05;
bon6=bon4+£²00000*0.03;
bon£±0=bon6+400000*0.0£±5;
printf("ÇëÊäÈëÀûÈói£º");
scanf("%ld",&i);
c=i/£±00000;
if(c>£±0) c=£±0;
switch(c)
{ case 0: bonus=£±*0.£±;break;
case £±: bonus=bon£±+(i-£±00000)*0.075;break;
case £² :
case 3: bonus=bon£²+(i-£²00000)*0.05; break;
case 4:
case 5: bonus=bon4+(i-400000)*0.03;break;
case 6:
case 7:

case 8:
case 9: bonus=bon6+(i-600000)*0.0£±5;break;
case £±0: bonus=bon£±0+(i-£±000000)*0.0£±;
}
printf("½±½ðÊÇ%£±0.£²f",bonus);
}

5.9 ÊäÈë4¸öÕûÊý£¬ÒªÇó°´ÓÉ´óµ½Ð¡µØ˳ÐòÊä³ö¡£

½â£º´ËÌâ²ÉÓÃÒÀ´Î±È½ÏµØ·½·¨ÅųöÆä´óС˳Ðò¡£ÔÚѧϰÁËÑ­»·ºÍÊý×éÒԺ󣬿ÉÒÔÓиü¶àµØÅÅÐò·½·¨¡£

#include
main()
{ int t,a,b,c,d;
printf("ÇëÊäÈë4¸öÕûÊý£º");
scanf("%d,%d,%d,%d",&a,&b,&c,&d);
printf("\n a=%d,b=%d,c=%d,d=%d\n",a,b,c,d);
if(a>b) {t=a; a=b; b=t;}
if(a>c) {t=a; a=c; c=t;}
if(a>d) {t=a; a=d; d=t;}
if(b>c) {t=a; b=c; c=t;}
if(b>d) {t=b; b=d d=t;}
if(c>d) {t=c; c=d; d=t;}
printf("ÅÅÐò½á¹ûÈçÏ£º\n");
printf("%d, %d, %d, %d\n",a,b,c,d);
}

5.£±0 ÓÐ4¸öÔ²Ëþ£¬Ô²ÐÄ·Ö±ðΪ(£²£¬£²)¡¢(-£²£¬£²)¡¢(£²£¬-£²)¡¢(-£²£¬-£²)£¬Ô²°ë¾¶Îª£±¡£Õâ4¸öËþµØ¸ß¶È·Ö±ðΪ£±0m¡£ËþÒÔÍâÎÞ½¨ÖþÎï¡£½ñÊäÈëÈΣ­µãµØ×ø±ê£¬Çó¸ÃµãµØ½¨Öþ¸ß¶È(ËþÍâµØ¸ß¶ÈΪÁã)¡£

³ÌÐòÈçÏ£º
#include
main()
{ int h=£±0;
float x£±=£²,y£±=£²,x£²=-£²,y£²=£²,x3=-£²,y3=-£²,x4=-£²,y4=-£²,x,y,d£±,d£²,d3,d4;
printf("ÇëÊäÈ룭¸öµã(x,y)£º");
scanf("%f,%f",&x,&y);
d£±=(x-x£±)*(x-x£±)+(y-y£±)*(y-y£±); /*Çó¸Ãµãµ½¸÷ÖÐÐĵãµØ¾àÀë*/
d£²=(x-x£²)*(x-x£²)+(y+y£²)*(y+y£²);
d3=(x+x3)*(x+x3)+(y-y3)*(y-y3);
d4=(x+x4)*(x-x4)*(y+y4)*(y+y4);
if(d£±>£±&&d£²>£±&&d3>£±&&d4>£±) h=0; /*ÅжϸõãÊÇ·ñÔÚËþÍâ*/
printf("¸Ãµã¸ß¶ÈΪ%d\n",h);
}

µÚÁùÕÂ
µÚÁùÕ¡¡Ñ­»·¿ØÖÆ

6.£±ÊäÈëÁ½¸öÕýÕûÊýmºÍn£¬ÇóÆä×î´ó¹«Ô¼ÊýºÍ×îС¹«±¶Êý¡£
main()
{long m,n,i=£±,j,s;
scanf("%ld,%ld",&m,&n);
for(;i<=m&&i<=n;i++)
{if(m%i==0&&n%i==0) s=i;}
if(m>=n) j=m;
else j=n;
for(;!(j%m==0&&j%n==0);j++);
printf("s=%ld,j=%ld\n",s,j);
}

6.£²ÊäÈ룭ÐÐ×Ö·û£¬·Ö±ðͳ¼Æ³öÆäÖÐÓ¢ÎÄ×Öĸ¡¢¿Õ¸ñ¡¢Êý×ÖºÍÆäËû×Ö·ûµØ¸öÊý¡£
#include"stdio.h"
main()
{char c;int i=0,j=0,k=0,l=0;
while((c=getchar())!='\n')
{if(c>=65&&c<=90||c>=97&&c<=£±£²£²) i++;
else if(c>=48&&c<=57) j++;
else if(c==3£²) k++;
else l++;}
printf("i=%d,j=%d,k=%d,l=%d\n",i,j,k,l);
}

6.3ÇóSn=a+aa+aaa+...aa...aaa£¨ÓÐn¸öa£©Ö®Öµ£¬ÆäÖÐaÊÇ£­¸öÊý×Ö¡£ÀýÈ磺£²+£²£²+£²£²£²+£²£²£²£²+£²£²£²£²£²£¨n=5£©£¬nÓɼüÅÌÊäÈë¡£
#include"math.h"
main()
{int n,sum=0,i=£±,s=£²;
scanf("%d",&n);
while(i<=n)
{sum=sum+s;s=s+£²*pow(£±0,i);
i++;}
printf("sum=%d\n",sum);
}

6.4 Çó £¬£¨¼´Çó£±!+£²!+3!4!+5!+...+£²0!£©
main()
{int n,i=£±;long sum=0,s=£±;
scanf("%d",&n);
while(i<=n) {s=s*i;sum=sum+s;i++;}
printf("sum=%ld\n",sum);
}

6.5 Çó
main()
{double i=£±,j=£±,k=£±,s£±=0,s£²=0,s3=0,sum;
for(;i<=£±00;i++) s£±=s£±+i;
for(;j<=50;j++) s£²=s£²+j*j;
for(;k<=£±0;k++) s3=s3+£±/k;
sum=s£±+s£²+s3;
printf("sum=%f\n",sum);
}

6.6´òÓ¡³öËùÓÐ"Ë®ÏÉ»¨Êý"£¬Ëùν"Ë®ÏÉ»¨Êý"ÊÇÖ¸£­¸öÈýλÊý£¬Æä¸÷λÊý×ÖÁ¢·½ºÍµÈÓڸñ¾Éí¡£ÀýÈ磺£±53ÊÇ£­¸öË®ÏÉ»¨Êý£¬ÒòΪ£±53=£±^3+5^3+3^3¡£
#include"math.h"
main()
{int x=£±00,a,b,c;
while(x>=£±00&&x<£±000) {a=0.0£±*x;b=£±0*(0.0£±*x-a);c=x-£±00*a-£±0*b;
if(x==(pow(a,3)+pow(b,3)+pow(c,3))) printf("%5d",x);x++;}
}

6.7£­¸öÊýÈç¹ûÇ¡ºÃµÈÓÚËüµØÒò×ÓÖ®ºÍ£¬Õâ¸öÊý¾Í³ÆΪ"ÍêÊý"¡£ÀýÈ磬6µØÒò×ÓΪ£±¡¢£²¡¢3£¬¶ø6=£±+£²+3£¬Òò´Ë6ÊÇ"ÍêÊý"¡£±à³ÌÐòÕÒ³ö£±000Ö®ÄÚµØËùÓÐÍêÊý£¬²¢°´ÏÂÃæ¸ñʽÊä³öÆäÒò×Ó£º
6¡¡its¡¡factors¡¡are¡¡£±¡¢£²¡