Q21 Write a program to implement dynamic memory allocation by using malloc() function.

Write a program to implement dynamic memory allocation by using malloc() function. 

#include<stdio.h>  
#include<stdlib.h>  
int main(){  
  int n,i,*ptr,sum=0;    
    printf("Enter number of elements: ");    
    scanf("%d",&n);    
    ptr=(int*)malloc(n*sizeof(int));   
    if(ptr==NULL)                         
    {
        printf("Sorry! unable to allocate memory");    
        exit(0);    
    }    
    printf("Enter elements of array: ");    
    for(i=0;i<n;++i)    
    {    
        scanf("%d",ptr+i);    
        sum+=*(ptr+i);    
    }    
    printf("Sum=%d",sum);    
    free(ptr);     
return 0;  
}

Output

Enter number of elements: 7
Enter elements of array: 19 20 21 22 23 24 25 26
Sum=154