012 C语言基础

// 111.c
#include<stdio.h>
void fun(char a[],char x)
{
    char *p=a,t;
    while(*a)a++;
    *(a+1)=0;
    *a=x;
    while(a>p)
    {
       if(*a<*(a-1)){t=*a;*a=*(a-1);*(a-1)=t;}
       a--;
    }
}
void main()
{
    char a[20]="134689",b[]="22334744";
    int i=0;
    while(b[i])
    {
       fun(a,b[i]);
       i++;
    }
    puts(a);
    getch();
}

// 112.c
#include<stdio.h>
void main()
{
    char a[]="this is a book ";
    int num=0,i;
    i=0;
    while(a[i])
    {
        while(a[i]==' '&&a[i])i++;
        if(a[i]!='\0')num++;
        while(a[i]!=' '&&a[i])i++;
    }
    printf("%d",num);
    getch();
}

// 113.c
#include<stdio.h>
void main()
{
    char a[]="this is a book this is a book ";
    int num=0,i,flag=0;
    i=0;
    while(a[i])
    {
        if(a[i]==' ')flag=0;
        else if(flag==0)
        {
           num++;
           flag=1;
        }
        i++;
    }
    printf("%d",num);
    getch();
}

//  114.c
#include<stdio.h>
void main()
{
    char a[][20]={"guanyu","zhangfei","zhaoyun"},tt[20];
    int b[]={99,97,98},i,j,t;
    for(i=0;i<2;i++)
      for(j=i+1;j<3;j++)
        if(b[i]<b[j])
        {
           t=b[i];b[i]=b[j];b[j]=t;
           strcpy(tt,a[i]);
           strcpy(a[i],a[j]);
           strcpy(a[j],tt);
        }
    for(i=0;i<3;i++)
       printf("%s:%d\n",a[i],b[i]);
    getch();
}

//  115.c
#include<stdio.h>
void main()
{
   char a[][20]={"guanyu","zhangfei","zhaoyun"},max[20];
   int i;
   strcpy(max,a[0]);
   for(i=1;i<3;i++)
     if(strcmp(max,a[i])<0)
       strcpy(max,a[i]);
   printf("%s",max);
   getch();
}

//   116.c
#include<stdio.h>
void main()
{
   int a[]={1,2,3,4,5,6,7,8,9,10,11,12,13,14,15},
   i,x;
   scanf("%d",&x);
   i=0;
   while(i<15)
   {
      if(x==a[i])break;
      i++;
   }
   if(i==15)printf("sorry not find");
   else printf("%d",i+1);
   getch();
}

//   117.c
#include<stdio.h>
int fun(int a[],int x)
{
   int min,mid,max,n=0;
   min=0;max=14;mid=(min+max)/2;
   while(a[mid]!=x)
   {
      if(x<a[mid])max=mid-1;
      else min=mid+1;
      mid=(min+max)/2;
      n++;
      if(n>15)return 0;
   }
   return mid+1;
}
void main()
{
   int a[]={1,2,3,4,5,6,7,8,9,10,11,12,13,14,15},
   m,x;
   scanf("%d",&x);
   m=fun(a,x);
   if(m>0)printf("%d",m);
   else printf("not found");
   getch();
}

//   118.c
#include<stdio.h>
int fun1(char a[],char b[])
{
   while(*b==*a&&*b){a++;b++;}
   if(*b==0)return 1;
   return 0;

}
int fun(char a[],char b[])
{
   int num=0;
   while(*a)
   {
      if(fun1(a,b)==1)num++;
      a++;
   }
   return num;
}
void main()
{
   char a[]="this is a book";
   printf("%d",fun(a,"is"));
   getch();
}

// 119.c
#include<stdio.h>
void main()
{
   int i,s=0;
   char m;
   for(i=0;i<4;i++)
   {
      s=0;
      m=i+65;
      if(m!='A')s++;
      if(m=='C')s++;
      if(m=='D')s++;
      if(m!='D')s++;
      if(s==3)break;
   }
   printf("%c",m);
   getch();
}

//  120.c
#include<stdio.h>
int fun()//不带形参的函数
{
   return 2;//正确的。
}
void fun()//没有确切的返回值
{
   return 1;
}
fun()//函数不带返回类型，那么它就是int型
{

}
float fun()//函数返回值要以float为准
{
   return 1;
}