array and pointers

array and pointers uses in c that you should know in programming

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5 important programs that you should know:

1.sorting technique of array using pointers:

#include<stdio.h>
#include<stdlib.h>
void create_array(int *p,int n);
void display(int *p,int n);
void sorting(int *p,int n);
int main()
{
    int *p,n;
    printf(“enter how many element you want to insert in the array?\n”);
    scanf(“%d”,&n);
    p=(int *)malloc(sizeof(int)*n);
    create_array(p,n);
     return 0;
}
void create_array(int *p,int n)
{
     printf(“enter the element in the array”);
    for(int i=0;i<n;i++)
    {
        scanf(“%d “,&p[i]);
    }
    display(p,n);
    sorting(p,n);
    printf(“after sorting\n”);
     display(p,n);

 

}
void display(int *p,int n)
{
     printf(“enter the element in the array”);
    for(int i=0;i<n;i++)
    {
        printf(“%d “,*(p+i));
    }

 

}
void sorting(int *p,int n)
{
    int temp,round;
    for( round=0;round<n-1;round++)
    {
        for(int i=0;i<n-round;i++)
        {
            if((p[i]>=p[i+1]))
            {
                temp=p[i];
                p[i]=p[i+1];
                p[i+1]=temp;
            }
        }
    }
}

2.reversing array using structure:

#include<stdio.h>
#include<stdlib.h>
struct x{
   int *p,n,start,end;
};
struct x* input( struct x *s1);
  struct x* reverse(struct x *s1);
   struct x* display( struct x *s1);
  int main()
  {
       struct x   *s1;
       s1=(struct x*)malloc(sizeof(struct x));
       printf(“how many number you want to insert in array\n”);
       scanf(“%d”,&s1->n);
       s1->p= (int *)malloc(sizeof(int)*s1->n);
       s1->start=0;
       s1->end=s1->n-1;
       s1=input(s1);
      return 0;
  }
    struct x* reverse(struct x *s1)
  { int temp;
        while(s1->start<s1->end)
    {
         temp=s1->p[s1->start];
        s1->p[s1->start]=s1->p[s1->end];
        s1->p[s1->end]=temp;
        s1->start++;
        s1->end–;
    }
      s1=display(s1);
  }
  struct x* input( struct x *s1)
  {
      printf(“enter the number\n”);
    for(int i=0;i<s1->n;i++)
    {
        scanf(“%d”,&s1->p[i]);
    }
    s1=reverse(s1);
    return(s1);
  }
  struct x* display( struct x *s1)
  { printf(“dsiplay the number\n”);
       for(int i=0;i<s1->n;i++)
    {
        printf(“%d “,s1->p[i]);
    }
    return(s1);
  }

3. dynamic memory allocations in c:

#include <stdio.h>
#include<conio.h>
struct temparature
{
    int mintemp,maxtemp;
};
int main()
{
  struct temparature t;
  int *days,n;
  printf(“enter the no of days\n”);
  scanf(“%d”,&n);
  days=(int *)malloc(sizeof(int)*n);
  for(int i=0;i<n;i++)
     {
         scanf(“%d”,(days+i));
     }
  avgtemp(days,n,t);
    return 0;
}
 void avgtemp(int *days,int n,struct temparature t)
 {
     int s=0;
     for(int i=0;i<n;i++)
     {
         s=s+days[i];
     }
     t.mintemp=s/n;
     printf(“%d”,t.mintemp);
 }

4.fibonacci using c:

#include<conio.h>
#include<stdio.h>
#include<stdlib.h>
struct fibo {
     int n,t1,t2,s;
};
 void fibonacci(struct fibo);
int main()
{
    struct fibo n1;
   printf(“enter the mumber\n”);
    scanf(“%d”,&n1.n);
    fibonacci(n1);
}
 void fibonacci(struct fibo n1)
 {
   n1.t1=-1;n1.t2=1;n1.s;
    for (int i = 0; i <=n1.n; i++)
    {
        n1.s=n1.t1+n1.t2;
        n1.t1=n1.t2;
        n1.t2=n1.s;
    printf(“%d\n”,n1.s);
    }
 }

5. sorting programs:

#include<stdio.h>
void input( int *p, int n );
void display(int *p,int n);
void sort(int *p,int n);
int main()
{
 int arr[20],n;
 printf(“enter the number of  values”);
 scanf(“%d”,&n);
 input(arr,n);
return 0;
}
void input( int *p, int n )
{
    printf(“enter the  elements”);
 for(int i =0;i<n; i++)
 scanf(“%d”,p+i);
  display( p,n);//p=arr=&arr[0]
   sort(p,n);
   }
void display(int *p,int n)
{
    printf(“display the elements”);
    for(int i =0;i<n; i++)
    printf(“%d\n”,*(p+i));
}
   void sort(int *p,int n)
   {
       int temp;
       for(int r=0;r<=n-1;r++)
{      for(int i=0;i<n-1;i++)
        {
            if(*(p+i)>=*(p+i+1))
            {
                temp=*(p+i);
                *(p+i)=*(p+i+1);
                *(p+i+1)=temp;
            }
        }
      }
       display( p,n);
}

array and pointers concept descriptions breifly

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