CremovePointFun, C (gcc)

CremovePointFun

//gcc 7.4.0

//write a function that removes an item from an integer array(use pointer to function)
//this code is created by Rezaul Hoque on June 07, 2021;  contact: jewelmrh@yahoo.com
//note: codes shared by Rezaul Hoque on rextester are not for sale; they are created and shared to facilitate the algorithm learning process; many like Hoque use this platform to practice programming ;Rezaul hopes his contribution helps others to fine tune their  learning;

#include <stdio.h>
#include <stdlib.h>
int n=5;

int retPos(int [], int);
 void del(int [],  int (*f)(int [],int ));
/***retPos function takes two parameters: one is the array, the other one is the item to be removed; array elements are searched till the desired item is found; once the item is found, the function returns the index of the item in the array.****/
int retPos(int a[],int q){
printf("\nItem to be deleted:\n");
scanf("%d\t",&q);//read the item to be removed from the user

for (int i=0; i<n;i++)
if(a[i]==q)//if found return the index
     return i;
}
/***del function takes two parameters: one is the integer array and the other is a pointer to function; ***/
void del(int  a[],   int (*f)(int a[],int q))
{
int b,x,q;
x=(*f)(a,q);//x is assigned the value fed by pointer to function

for (b=x;b<n;b++)//loop control variable b is initialized with the returned index(x) of the searched item;as long as it is less than the size of array, increment b and...
a[b]=a[b+1];//value stored at index b of the resultant array is that of index b+1 of the initial array; remember one item is going to be removed so this reordering of the index is needed ...
--n;//decrement n;
}
int main()
{
int a[5]={10,20,25,30,40};//the array

//print the initial array
printf("\nInitial array:\n");
for(int i=0;i<n;i++)
printf("%d\t",a[i]);
//the delete function is called to remove the item;note function retPos is in the parameter of the delete function 
del(a,retPos);
//after removal of the item, print the new array
printf("\nNew array:\n");
for(int i=0;i<n;i++)
printf("%d\t",a[i]);
return 0;
}


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