#include<stdio.h>
int a[15]
void main()
{
    void sort(int a[]);
    int i;
    ptintf("input 15 numbers:\n");
    for(i=0;i<15;i++)
        scanf("%d",&a[i]);
    printf("\n");
    sort(a);
    void search(int a[],int j);
    int j;
    printf("please enter a number:\n");
    scanf("%d",&j);
    search(j);
}
void sort(int a[])
{
    int x,y,t;
    for(x=0;x<14;x++)
    for(y=0;y<14-x;y++)
        if(a[y]<a[y+1])
        {t=a[y];a[y]=a[y+1];a[y+1]=t;}
}
void search(int a[],int j)
{
    int i,x,left=0,right=14,mid,find=0;
        do{
            mid=(left+right)/2;
            if (x=a[mid])
            {printf("a[%d]\n",mid);find=1;}
            else if(x>a[mid])  
            {right=mid;}
                else if(x<a[mid])  
                {left=mid+1;}
                while(left<=right&&find==0);
                if(find==0)
                {printf("无此数");}
                else {printf("\n");}
        }
}

int j；c语言不允许中途声明变量
search()有2个形参
search()少了do与while不匹配了
if (x=a[mid])应用==



[ 本帖最后由 风之上位 于 2009-12-27 17:02 编辑 ]

编程风格有问题看的头晕，帮你稍微改改，你自己编译下
#include<stdio.h>
int a[15];
void main()
{
    void sort(int a[]);
    void search(int a[],int jj);
    int i,j;
    printf("input 15 numbers:\n");
    for(i=0;i<15;i++)
        scanf("%d",&a[i]);
    printf("\n");
    sort(a);
    printf("please enter a number:\n");
    scanf("%d",&j);
    search(a,j);
}
void sort(int a[])
{
    int x,y,t;
    for(x=0;x<14;x++)
    for(y=0;y<14-x;y++)
        if(a[y]<a[y+1])
        {t=a[y];a[y]=a[y+1];a[y+1]=t;}
}
void search(int a[],int jj)
{
    int i,left=0,right=14,mid,find=0;
    do{
        mid=(left+right)/2;
        if (jj==a[mid])
        {
            printf("a[%d]\n",mid);
            find=1;
        }
        else if(jj>a[mid])  
        {
            right=mid;
        }
        else if(jj<a[mid])  
        {
            left=mid+1;
        }
    }while(left<=right&&find==0);
    if(find==0)
    {
        printf("no this num\n");
    }
    else
    {
        printf("\n");
    }
}
编程逻辑我没看，


代码好混乱····
#include<stdio.h>
void main()
{    int a[15];
    void sort(int a[]);
    void search(int a[],int j);
    int i, j;
    printf("input 15 numbers:\n");
    for(i=0;i<15;i++)
        scanf("%d",&a[i]);
    printf("\n");
    sort(a);   
    printf("please enter a number:\n");
    scanf("%d",&j);
    search(a,j);
}
void sort(int a[])
{
    int x,y,t;
    for(x=0;x<14;x++)
    for(y=0;y<14-x;y++)
        if(a[y]<a[y+1])
        {
            t=a[y];a[y]=a[y+1];a[y+1]=t;
        }
}
void search(int a[],int x)
{
    int i,left=0,right=14,mid,find=0;
        do{
            mid=(left+right)/2;
            if (x==a[mid])
            {
                printf("a[%d]\n",mid);find=1;
            }
            else if(x>a[mid])      
                right=mid;            
                else if(x<a[mid])                  
                    left=mid;               
        }while(left<=right&&find==0);

                if(find==0)
                    printf("无此数");
                else
                    printf("\n");
}