for(i=0;i { strcpy(t,p[i]);strcpy(p[i],p[j]);strcpy(p[j],t);} } void main() {char p[][10]={\ f(p,5); printf(\} A£©6 B£©4 C£©5 D£©3 7.2 Ìî¿ÕÌâ 7.2.1 ÔÚCÓïÑÔÖУ¬³ýÖ÷º¯ÊýÍ⣬Æä×Óº¯Êý·ÖΪ ±ê×¼¿âº¯Êý¡¢×Ô¶¨Ò庯Êý Á½Àà¡£ 7.2.2 ±äÁ¿ÔÚ³ÌÐòʹÓÃÖУ¬Æä×÷ÓÃÓò¿É·ÖΪ È«¾Ö ±äÁ¿ºÍ ¾Ö²¿ ±äÁ¿¡£ 7.2.3 ÒÔϺ¯ÊýÓÃÒÔÇóxµÄy´Î·½,Çë²¹³äÌî¿Õ¡£ double fun ( double x , int y ) { int i; double z; for ( i=1 ; i <=y ; i + + ) z= z*x ; return z; } 7.2.4 ÒÔϳÌÐòµÄ¹¦ÄÜÊǼÆËã s?long f(int n) { int i; long s; s= 1 ; for(i=1; i<=n; i++) s= s*i ; return s; main() { long s; int k,n; scanf(\s= 0 ; for(k=0; k<=n; k++) s=s+ f(k) ; printf(\ } 7.3 ±à³ÌÌâ 7.3.1 ±àдһ¸öº¯Êý£¬Æä¹¦ÄÜÊÇÅжÏÒ»¸öÊÇ·ñÊÇËØÊý£¬ÊÇ·µ»ØÎª1£¬²»ÊÇ·µ»ØÎª0¡£ int isprime(int x) { int i; for(i=2;i<=x/2;i + + ) if(x%i = = 0) return (0); ?k!£¬Çë²¹³äÌî¿Õ¡£ k?0n return 1 ; } 7.3.2 ±àдһ¸öº¯Êý£¬Æä¹¦ÄÜÊǼÆËã¶þάÊý×éÿÐÐÖ®ºÍÒÔ¼°Ã¿ÁÐÖ®ºÍ¡£ void fun(int a[][4],int n,int row[],int col[]) { int i,j; for (i=0;i for (i=0;i<4;i++) col[i]=0; for (i=0;i row[i]+=a[i][j]; col[j]+= a[i][j]; } } 7.3.3 ±àÒ»×Óº¯Êý£¬ÔÚ100¡«999ÖдòÓ¡³öËùÓеÄ\Ë®ÏÉ»¨Êý\¡£Ëùν\Ë®ÏÉ»¨Êý\Ö¸Ò»¸ö ÈýλÊý£¬Æä¸÷λÊý×ÖÁ¢·½ºÍµÈÓÚ¸ÃÊý±¾Éí¡£ÀýÈ磺153ÊÇÒ»\Ë®ÏÉ»¨Êý\£¬ÒòΪ153=13+53+33 void fun() {int I,j,k,n; for (n=100;n<1000;n++) {i=n/100; j=n/10-i*10; k=n; if(n==i*i*i+j*j*j+k*k*k) printf(¡°%d¡±,n); } printf(¡°\\n¡±); } 7.3.4 ´Ó¼üÅÌÉÏÊäÈë¶à¸öµ¥´Ê£¬ÊäÈëʱ¸÷µ¥´ÊÓÿոñ¸ô¿ª£¬ÓÃ'#'½áÊøÊäÈë¡£ÏÖ±àдһ ¸ö×Óº¯Êý°Ñÿ¸öµ¥´ÊµÄµÚÒ»¸ö×Öĸת»»Îª´óд×Öĸ£¬ÆäÖ÷º¯ÊýʵÏÖµ¥´ÊµÄÊäÈë¡£ void fun(char str[]) { int i=0,j=0; while (str[i]!='#') { if (str[i++]==' ') { if (str[j]>='a'&&str[j]<='z') str[j]-=32; j=i; } } } 7.3.5 ±àдº¯Êýfun(char str[20], int num£Û10£Ý),ËüµÄ¹¦ÄÜÊÇ£º·Ö±ðÕÒ³ö×Ö·û´®ÖÐÿ¸ö Êý×Ö×Ö·û(0£¬1£¬2£¬3£¬4£¬5£¬6£¬7£¬8£¬9)µÄ¸öÊý£¬ÓÃnum£Û0£ÝÀ´Í³¼Æ×Ö·û0µÄ¸öÊý£¬ÓÃnum£Û1£ÝÀ´Í³¼Æ×Ö·û1µÄ¸öÊý£¬ÓÃnum£Û9£ÝÀ´Í³¼Æ×Ö·û9µÄ¸öÊý¡£×Ö·û´®ÓÉÖ÷º¯Êý´Ó¼üÅ̶ÁÈë¡£ fun(char str[20], int num[10]) {int i; for (i=0;i<10;i++) num[i]=0 for (i=0;str[i]!=?\\0?;i++) num[str[i]-?0?]++; } ϰÌâ°Ë 8.1 Ñ¡ÔñÌâ 8.4.1 ÏÂÃæ¸÷Óï¾äÐÐÖУ¬ÄÜÕýÈ·½øÐи³×Ö·û´®²Ù×÷µÄÓï¾äÐÐÊÇ ( C) A) char s[4][5]={ \ B) char s[5]={?a?,?b?,?c?,?e?,?f?}; C) char *s; s=\ D) char *s=; scanf(¡°%s¡±,s); 8.4.2 ÕýÈ·µÄÊý×鶨ÒåÓï¾äΪ (D ) A) int A[¡°a¡±]; B) int A[3,5]; C) int A[ ][ ]; D) int *A[3]; 8.4.3 ÈôÓÐÒÔÏÂ˵Ã÷ºÍÓï¾ä£¬¶ÔcÊý×éÔªËØµÄÕýÈ·ÒýÓÃÊÇ(D) int c[4][5], (*cp)[5]; cp=c; A) cp+1 B) *(cp+3) C) *(cp+1)+3 D) *(*cp+2) 8.4.4 Ö´ÐÐÏÂÁÐÓï¾äºó£¬ÆäÊä³ö½á¹ûΪ (B ) #include { int **k, *j, i=100; j=&i; k=&j; printf(\} A) ÔËÐдíÎó B) 100 C) iµÄµØÖ· D) jµÄµØÖ· 8.4.5 ÉèÓÐÈçϵijÌÐò¶Î: char str[ ]=\char *ptr;ptr=str; Ö´ÐÐÉÏÃæµÄ³ÌÐò¶Îºó£¬*(ptr+5)µÄֵΪ( B ) A) 'o' B) '\\0' C) ²»È·¶¨µÄÖµ D) 'o'µÄµØÖ· 8.4.6 ÈôÓÐ˵Ã÷£ºlong *p,a; Ôò²»ÄÜͨ¹ýscanfÓï¾äÕýÈ·¸øÊäÈëÏî¶ÁÈëÊý¾ÝµÄ³ÌÐò¶ÎÊÇ£¨A£©¡£ A£©*p=&a;scanf(\ B£©p=(long *)malloc(8);scanf(\ C£©scanf(\ D£©scanf(\8.4.7 ÏÂÃæº¯ÊýµÄ¹¦ÄÜÊÇ£¨B £© sss(s, t) char *s, *t; { while((*s)&&(*t)&&(*t++==*s++)); return(*s-*t);} A) Çó×Ö·û´®µÄ³¤¶È B) ±È½ÏÁ½¸ö×Ö·û´®µÄ´óС C) ½«×Ö·û´®s¸´ÖƵ½×Ö·û´®tÖÐ D) ½«×Ö·û´®s½ÓÐøµ½×Ö·û´®tÖÐ 8.4.8 ÇëÑ¡³öÒÔϳÌÐòµÄÊä³ö½á¹û£¨B £© #include sub(10,5,&a); sub(7,a,&b); sub(a,b,&c); printf(\} A) 5,2,3 B) -5,-12,-7 C) -5,-12,-17 D) 5,-2,-7 8.4.9 ÏÂÃæº¯ÊýµÄ¹¦ÄÜÊÇ£¨A£© int fun1(char*x) { char *y=x; while(*y++); return(y-x-1); } A£©Çó×Ö·û´®µÄ³¤¶È B£©±È½ÏÁ½¸ö×Ö·û´®µÄ´óС C£©½«×Ö·û´®x¸´ÖƵ½×Ö·û´®y D£©½«×Ö·û´®xÁ¬½Óµ½×Ö·û´®yºóÃæ 8.2 Ìî¿ÕÌâ 8.2.1 ÔÚÖ¸ÕëµÄ¸ÅÄîÖУ¬¡°*¡±±íʾµÄº¬ÒåÊÇËùÖ¸¶ÔÏóµÄÄÚÈÝ£¬¶ø¡°&¡±±íʾµÄº¬ÒåÊÇ È¡±äÁ¿µÄµØÖ· ¡£ 8.2.2 Èç¹ûpÊÇÒ»¸öÖ¸Õ룬ÄÇô*&p±íʾµÄº¬ÒåÊÇ P £¬¶ø&*p±íʾµÄº¬ÒåÊÇ P ¡£ 8.2.3 ͳ¼Æ´ÓÖÕ¶ËÊäÈëµÄ×Ö·ûÖÐÿ¸ö´óд×ÖĸµÄ¸öÊý¡£ÓÃ#ºÅ×÷ΪÊäÈë½áÊø±êÖ¾£¬Çë Ìî¿Õ¡£ #include for(i=0; i<26; i++) num[i]=0; while( (c(»òÕß*pc)=getchar()) !='#') /*ͳ¼Æ´ÓÖÕ¶ËÊäÈëµÄ´óд×Öĸ¸öÊý*/ if( isupper(*pc)) num[*p-65]+=1; for(i=0; i<26; i++) /*Êä³ö´óд×ÖĸºÍ¸Ã×ÖĸµÄ¸öÊý*/