习题集

/*将s所指字符串中的字母转换成按字母序列的后续字母（但Z转化A，z转化a）其他的字符不变*/

#include <stdio.h>
#include <ctype.h>
#include <conio.h>

void fun(char *s)
{
 while (*s)
 {
  if(*s>='A'&&*s<='Z'||*s>='a'&&*s<='z')     /*判断字符是否为字母*/
  {
    if (*s=='Z')
          *s='A';
       else if (*s=='z')
       *s='a';
             else
     *s=*s+1;          /*该字母的ASCII码值加1*/
  }
           s++;               /*字符指针后移*/
 }
}

main()
{
 char s[80];
 printf("\nEnter a string with length <80:\n\n");
 gets(s);
 printf("\nThe string :\n\n");
 puts(s);
 fun(s);
 printf("\n\n The Cords:\n\n");
 puts(s);
}

 

 

 

测试题7 （！）

#include <conio.h>
#include <stdio.h>
#include <string.h>

void fun(char *ss)
{
    int i;
    for(i=0;ss[i]!='\0';i++)
        if (i%2==1 && ss[i]>='a' && ss[i]<='z')
            ss[i]=ss[i]-32;
}

main()
{
    FILE *wf;
    char tt[81],s[10]="abc4Efg";
    printf("\nPlease enter an string within 80 characters:\n");
    gets(tt);
    printf("\n\n After changing the string \n%s",tt);
    fun(tt);
    printf("\n becones \n%s\n",tt);
    wf=fopen("out.dat","w");
    fun(s);
    fprintf(wf,"s",s);
    fclose(wf);
    getch();
}

/*将单链表的元素从小到大排序，即若原链表元素为：10， 4，2，8，6，则排序后为2,4,6,8,10*/
#include <stdio.h>
#include <stdlib.h>
#define NULL 0
typedef struct node
{
    int data;
    struct node *next;
}NODE;

void fun(NODE *h)
{
    NODE *p,*q;
    int t ;
    p=h;
    while (p)
    {
        q=p->next;
        while (q)
        {
            if (p->data>q->data)       
            { 
            t=p->data;
            p->data=q->data;
            q->data=t;
            }
            q=q->next;
        }
        p=p->next;
    }
}

void main()
{
    NODE *h=NULL,*p,*q;
    int i,a[6]={0,10,4,2,8,6};
    for(i=1;i<=5;i++)
    {
        q=(NODE*)malloc(sizeof(NODE));
        q->data=a[i];
        q->next=NULL;
        if (h==NULL)
            h=p=q;
        else
        {
            p->next=q;
            p=q;
        }
    }

    printf("1----");
    p=h;
    while(p)
    {
        printf("%d   ",p->data);
        p=p->next;
    }
    fun(h);

    printf("\n2----");
    p=h;
    while(p)
    {
        printf("%d   ",p->data);
        p=p->next;
    }
    
}

 

/*N名学生的数据已在主函数中放入结构体数组s中，下列给定的程序中，函数fun（）的功能是：

把分数最高的学生数据放在h所指的数组中。注意：分数最高的学生可能不止一个，函数返回分数最高的学生的人数*/

 

#include <stdio.h>
#define N 16
typedef struct
{
    char num[10];
    int s;
}STREC;

int fun (STREC *a,STREC *b)
{
    int i,j=0,max=a[0].s;
    for(i=0;i<N;i++)
        if(max<a[i].s )
            max =a[i].s;
        for (i=0;i<N;i++)
            if (max==a[i].s )
                b[j++]=a[i];
            return j;
}

main ()
{
    STREC s[N]={{"GA005",85},{"GA003",76},{"GA004",85},{"GA002",69},
    {"GA001",91},{"GA007",72},{"GA008",64},{"GA006",86},{"GA015",85},{"GA013",91},
    {"GA012",64},{"GA014",91},{"GA011",66},{"GA017",64},{"GA018",64},{"GA016",72}};

    STREC h[N];
    int i,n;
    FILE *out;
    n=fun(s,h);
    printf("The %d highest score :\n",n);
    for (i=0;i<n;i++)
        printf("%s %4d \n",h[i].num,h[i].s);
        printf("\n");
        out=fopen("out45.dat","w");
        fprintf(out,"%d\n",n);
        for(i=0;i<n;i++)
            fprintf(out,"%4d\n",h[i].s);
        fclose(out);
      
}

 

 

 

#include <stdio.h>
#define N 16
typedef struct
{
 char num[10];
 int s ;
}STREC;

int fun (STREC a[])
{
int i=0,j=0;
STREC strTEMP;
for(;i<N;i++)
for(j=i;j<N;j++)
{
 if(a[i].s <a[j].s)
 {
  strTEMP =a[i];
  a[i]=a[j];
  a[j]=strTEMP;
 }
}
return 0;
}

 

main()
{
 STREC s[N]={{"GA005",85},{"GA003",76},{"GA004",85},{"GA002",69},
    {"GA001",93},{"GA007",72},{"GA008",64},{"GA006",86},{"GA015",85},{"GA013",91},
    {"GA012",64},{"GA014",91},{"GA011",66},{"GA017",64},{"GA018",64},{"GA016",72}};

 int i;
 FILE *out;
 fun(s);
 printf("The data after scored :\n");
 for (i=0;i<N;i++)
 {
  if ((i)%4==0)
   printf("\n");
 printf("%s    %4d   ",s[i].num,s[i].s);
  for (i=0;i<N;i++)
  {
   if ((i)%4==0 &&i )
    fprintf(out,"\n");
   fprintf(out,"%4d   ",s[i].s);
  }
  fprintf(out,"\n");
  fclose(out);
 }
}