Question

Write a C language program that will prompt for 12 different resistor values, entered one at a time via the keyboard, expressed in Ohms. Valid values are 0.01 Ohm up to 10,000,000,000 Ohms. Write each entry to a text file on the disk thus: Resistor 1 Ohmic value = 2200. Update the resistor number for each of the 12 entries. Do not repeat any resistance value.

Write a second C language program to read the 12 entries from the text file. Then convert each resistance value from character data to a number. Find and print to the screen the minimum and maximum resistance values entered. Compute and print to the screen the sum of all the resistance values and the average of the 12 values.

First Program is:

#include
#include
int main(void) {
   FILE* fp;
   float R[12]; //Array of values to be entered
   int k;
   char filename[] = "resistors.txt"; //Stored in directory with programs
   if ((fp = fopen(filename, "w")) == NULL) { //Open for writing
       fprintf(stderr, "\nError opening %s", filename);
       exit(1);
   }
   for (k = 0; k < 12; ++k) { //Loop reads in 12 resistor values
       printf("\nEnter resistor %2i value in Ohms: ", k + 1);
       fflush(stdin);
       scanf("%f", &R[k]);
       fprintf(fp, "Resistor %2d = %.3f\n", k + 1, R[k]);
   }
   fclose(fp); //Close file
   return(0);
}

Answer 1

SECOND PROGRAM:

C CODE:

#include<stdio.h>

#include<stdlib.h>

int main(void) {

    FILE* fp;

    float R[12]; //Array of values to be entered

    int k;

    char filename[] = "resistors.txt"; //Stored in directory with programs

    if ((fp = fopen(filename, "r")) == NULL) { //Open for reading

        fprintf(stderr, "\nError opening %s", filename);

        exit(1);

    }

    char word[50];// To read unnecessary text from the file

    for (k = 0; k < 12; ++k) { //Loop reads in 12 resistor values

        fscanf(fp, "%s %s %s %f", word, word, word, &R[k]);

    }

    float min = R[0], max = R[0], sum = R[0], avg;

    for(k = 1; k < 12; ++k){

        if(max < R[k])

            max = R[k];

        if(min > R[k])

            min = R[k];

        sum += R[k];

    }

    avg = sum/12;

    printf("Minimum resistance value: %.3f ohm\n", min);

    printf("Maximum resistance value: %.3f ohm\n", max);

    printf("Sum of all resistance values: %.3f ohm\n", sum);

    printf("Average of all resistance values: %.3f ohm\n", avg);

    fclose(fp); //Close file

    return(0);

}

INPUT FILE USED:

OUTPUT:

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