Answered: Write a C function that is given a…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

Write a C function that is given a pointer to memory, the number of bytes of memory the pointer points at, and two pointers to uint32_t. Your job is to treat the pointer as if it were a pointer to an array of uint32_t, find the min and max values of the array, and write the results to the locations pointed at by the uint32_t pointers.

The number of bytes will be a positive multiple of 4. Do not worry about endianess in this problem.

Note the tester has command line options -Wall -Wextra -Werror -fsanitize=address to help you catch errors.

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1 #include <stdint.h>
2
3 // Treat ptr as base address of a uint32_t array and place the min and
4 // max array values in memory where min and max point.
5 // num_bytes is a multiple of 4.
6 - void min_max(void *ptr, int num_bytes, uint32_t *min, uint32_t *max) {
uint32_t *ptr32 = (uint32_t *)ptr;
// your code goes here
9 }
10|
7
8

Expert Solution

Step 1

Code:

#include<stdio.h>

#include<stdint.h>

//Treat ptr as the base address of a uint32_t array and place the min and

//max array values in memory where min and max point.

//num_bytes is a multiple of 4.

void min_max(void *ptr, int num_bytes, uint32_t *min, uint32_t *max)

{

uint32_t *ptr32 = (uint32_t *)ptr;

//Looping to access array elemnts using pointer

//to find minimum and maximum values of array and

//place them in memory where min and max points

for(int i=0;i<(num_bytes/4);i++)

{

//If value at pointer of array is greater than value at memory location of max

//Then assign value at pointer of array to memory location of max

if(ptr32[i]>*max)

{

*max =ptr32[i];

}

//If the value at the pointer of array is less than value at memory location of min

//Then assign value at pointer of array to memory location of min

if (ptr32[i]< *min)

{

*min = ptr32[i];

}

int main()

{

//Declare variables;

int arr[10] ;

uint32_t min = 4294967295; //Set min value to (2 power 32)-1

uint32_t max = 0; //set max value to 0

//Read 10 array elements

printf("Enter 10 Array Elements: ");

for(int i=0;i<10;i++)

{

scanf("%d",&arr[i]);

}

//Declare a void pointer and assign array to it

void *ptr =arr;

//call min_max function

min_max(ptr,sizeof(arr),&min,&max);

//Display The MIN and MAX values of uint32_t array

printf("\nMIN Value in uint32 Array: %lu",min);

printf("\nMAX Value in uint32 Array: %lu", max);

}

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