design c program to find the biggest and smallest numder of entered numbers N, then save the result in a text file

Question

Solution using stdio.h in the main function

Answer 1

Here is some C-code which will do that for you.

You may need to update the fopen() and itoa() functions, depending upon your compiler. But they shouild still run OK.

Just copy out the code below and paste it into your compiler/IDE

in the next answer.

 

 

// This code will open a console window for user input

// the user will be invited to enter an integer (from the keyboard)

// the code will initially assign the 1st user-entered integer as the

// value of both maximum and minimum values

// thereafter, there will be two distinct values - one max and the other min.

// both positive and negative values may be entered

// to terminate the program, the user should enter the value 0 (zero)

 

#include <stdio.h>

#include <limits.h>

#include <string.h>

#include <stdlib.h>

 

 

void collect(int* n);

int check_value();

 

The rest of the code follows below

Comments

int main()

{

       int num_min = INT_MAX, num_max = INT_MIN, N;

       char num_min_str[256], num_max_str[256];

 

       FILE *fp;

 

       if((fp=fopen("maxminvals","w")) == NULL)

       {

              printf("Unable to open a file for writing to\n");

              return(-1);   // exit the program

       }                           // use -1 return value to indicate an error

                                    // although that is pretty uneccessary here

                                    // in this stand alone code

       do

       {

              collect(&N);  // send the address of the variable N to the function collect()

 

              if (N < num_min)     // on the first run through this loop

                     num_min = N;  // num_min and num_max will both hold

              if(N > num_max)             // the same value of N

                     num_max = N;

              printf("Minimum number is: %d, Maximum number is: %d\n",num_min,num_max);

       }while (N!=0);

​The rest of the main() function is in the next answer

---

// since the data is to be written to a text file

       // then convert the integer values to strings

       itoa(num_min,num_min_str,10);

       itoa(num_max,num_max_str,10);

 

       // write data to file

       fwrite(num_min_str,sizeof(num_min_str),1,fp);

       fwrite(num_max_str,sizeof(num_max_str),1,fp);

 

       // now finish off by closing the file

       fclose(fp);

       return(0);    // exit the program

}

 

The two sub-routines now

---

void collect(int* n) // collect input from the user

{

       printf("Enter an integer, positive or negative: ");

       *n = check_value();  // check that the user is inputting a valid integer value

}

 

int check_value()    // ensure that the user always enters only an integer value

{

       int x;

    float check;

 

    reprocess: // this is a goto construct label

    scanf_s("%f", &check);

    x=check;  // you may get warnings here (from compiler) because of possible loss of data

    if (x!=check)

    {

         printf("\nThis is not an integer number, please insert an integer!\n\n");

         goto reprocess;    // don't use goto unless very simple and uninvolved with other code!

    }                                      // goto statements are best avoided

    return x;

}