C语言程序经典示例—-（20）寻找指定元素的指针

#include <stdio.h>

#define MAX 20

int search(int *apt,/*已知数表的首元指针*/

int n,/*数表中元素个数*/

int key)/*要寻找的值*/

{

int *p;

for(p=apt;p<apt+n;p++)

if(*p==key)

return p-apt;/*返回找到元素的下标*/

return -1;

}

int *find(int *apt,/*已知数表的首元指针*/

int n,/*数表中元素个数*/

int key)/*要寻找的值*/

{

int *p;

for(p=apt;p<apt+n;p++)

if(*p==key)

return p;/*返回找到元素的指针*/

return NULL;

}

 

int a[]={90,80,70,60,50,40,30,20,10,9,8,7,6,5,42,40,50,1,2,3};

main()

{

int i,key;

clrscr();

printf(“The elements of array a is:n”);

for(i=0;i<sizeof(a)/sizeof(a[0]);i++)

printf(” %d”,a[i]);

printf(“nThe address of a[0] is: %d.n”,&a[0]);

puts(“nPlease input the key number you want to search:”);

scanf(“%d”,&key);

i=search(a,sizeof(a)/sizeof(a[0]),key);

printf(“nThe label number of the key number %d in the array is: %d.”,key,i);

printf(“nThe point value of the key number %d in the array is: %d.”,key,find(a, sizeof(a)/sizeof(a[0]),key));

 

puts(“nn Press any key to quit…”);

getch();

}

 

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