Question

4. Write a program that reads all numbers from a file and determines the highest and lowest numbers. You must NOT use arrays to solve this problem! Write functions where appropriate.

Programming language should be C

Answer 1

Please find below the code, code screenshots and output screenshots. Please refer to the screenshot of the code to understand the indentation of the code.  Please get back to me if you need any change in code. Else please upvote

CODE:

#include <stdio.h>

//function prototype

void findMinMax(FILE *fp, int *min, int *max);

int main()

{

    int min, max; //Variables for smallest and largest numbers

    char filename[200]; //Variable for filename

   

    printf("Enter the filename: ");

    scanf("%s", filename); //Reading the filename from user

    FILE *fp = fopen(filename, "r"); //Open the file in read mode

    if (fp == 0)

    {

        printf("Failed to open file %s\n", filename); //display error if file open fails

        return 1; //and return

    }

   

    findMinMax(fp, &min, &max); //calling findMinMax() with fp, min and max as call by reference

    fclose(fp); //closing the file

    printf("Smallest Number: %d\n", min); //displaying the Smallest number

    printf("Largest Number: %d\n", max); //displaying the Largest Number

   

    return(0);

}

//Function to find smallest and largest number in file

void findMinMax(FILE *fp, int* min, int* max){

   

    int num;

   

    fscanf(fp, "%d", &num); //Reading the first number from file

    *min = num; //set the number as min and max

    *max = num;

   

    while (fscanf(fp, "%d", &num) == 1) //Reading the remaining numnbers line by line

    {

        if (num < *min) //If num read is less than current min, set num as min

            *min = num;

        if (num > *max) //If num read is greater than current max, set num as max

            *max = num;

    }

}

INPUT FILE (numbers.txt):

OUTPUT: