# 实验五

Part 1

1.实现方式1：形参是数组，实参是数组名，使用数组元素直接访问方式实现

```#include  <stdio.h>
const int N=5;
int binarySearch(int x[], int n, int item);
int main() {
int a[N]={1,3,9,16,21};
int i,index, key;

printf("数组a中的数据:\n");
for(i=0;i<N;i++)
printf("%d ",a[i]);
printf("\n");

printf("输入待查找的数据项: ");
scanf("%d", &key);

index=binarySearch(a,N,key);

if(index>=0)
printf("%d在数组中，下标为%d\n", key, index);
else
printf("%d不在数组中\n", key);

return 0;
}

int binarySearch(int x[], int n, int item) {
int low, high, mid;

low = 0;
high = n-1;

while(low <= high) {
mid = (low+high)/2;

if (item == x[mid])
return mid;
else if(item < x[mid])
high = mid - 1;
else
low = mid + 1;
}

return -1;
}```

2.实现方式2：形参是指针变量，实参是数组名，使用指针变量间接访问方式实现

```#include  <stdio.h>
const int N=5;
int binarySearch(int *x, int n, int item);
int main() {
int a[N]={1,3,9,16,21};
int i,index, key;

printf("数组a中的数据:\n");
for(i=0;i<N;i++)
printf("%d ",a[i]);
printf("\n");

printf("输入待查找的数据项: ");
scanf("%d", &key);

index=binarySearch(a,N,key);

if(index>=0)
printf("%d在数组中，下标为%d\n", key, index);
else
printf("%d不在数组中\n", key);

return 0;
}

int binarySearch(int *x, int n, int item) {
int low, high, mid;

low = 0;
high = n-1;

while(low <= high) {
mid = (low+high)/2;

if (item == *(x+mid))
return mid;
else if(item < *(x+mid))
high = mid - 1;
else
low = mid + 1;
}

return -1;
}```

```#include <stdio.h>
#include <string.h>
void selectSort(char str[][20], int n );
int main() {
char name[][20] = {"John", "Alex", "Joseph", "Candy", "Geoge"};
int i;

printf("输出初始名单:\n");
for(i=0; i<5; i++)
printf("%s\n", name[i]);

selectSort(name, 5);

printf("按字典序输出名单:\n");
for(i=0; i<5; i++)
printf("%s\n", name[i]);

return 0;
}

void selectSort(char str[][20], int n) {
int i, j, k;
char temp[20];

for(i=0; i<n-1; i++) {
k = i;

for(j=i+1; j<n; j++)
if (strcmp(str[j],str[k])<0)
k = j;

if(k != i) {
strcpy(temp,str[i]);
strcpy(str[i],str[k]);
strcpy(str[k],temp);
}
}
}```

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