Thread: Search with pointers

Hi ,I am learning C and I am stack with this code ,any help will be greatly appreciated!

Code:

#include <stdio.h>
char * findChar(char a[],int size,char key);
int main()
 {       
    char *keyValue,key;
    int size=20;
    char a [21];               
    printf("Enter the key: ");
    scanf("%c",& key);
    printf("Enter an input up to 20 characters: ");
    scanf("%s",a);
    keyValue=findChar(a,size,key);
    printf("%c",keyValue);
    getch();
    return 0;
 }
 
  char * findChar(char a[],int size,char key)
   {
     int i;
     char *pfounded;
       for(pfounded=a,i=0;i<size;i++)
       {               
          if(*(pfounded+i)==key)     
           {
             return *(pfounded+i);
           }
         else
            return NULL;
        }
    }

We can't really help you unless you tell us what exactly about this code you're stuck with. Asking specific questions will generally get you better, more relevant answers.

The function supposed to return a pointer to the first occurrence of the character key in the array,and takes the array ,the size of the array and the search key

Thank you for the help ,your solution is great.Could you just explained the last row of the first code

if a!=end
then a points to element after key-found (because a++ in while), therefore return a-1
else
return 0 ( not found - 0 is same as NULL for pointer context )