CODEWITHSUNDEEP
arraysc
Bryan
Bryan

Reputation: 27

What are the possible reasons an array will repeat an index multiple times?

I am working on a program in C that will take the input of a temperature from a user and return a substance and boiling point if it is within 3% of that substance's BP.

I have currently run into 2 issues that I can't seem to solve.

  1. The function int find_substance(double value) seems to skip and not print some iterations. I have it set to print the index to make sure the indexes are chosen properly. I checked each value on the table and the only ones that don't print are -78.5, -35.5, and 3,280.00.
  2. Another issue at hand is when I reach the 8th index, 2,212.00, it prints index = 9. Following this, each iteration prints index = 9, until I reach the last index where it prints nothing.

So what could cause an error like this?

I have checked the arrays to make sure there weren't any errors I missed and still have yet to find what is causing the problem.

#include <stdio.h>
#include <stdlib.h>
const char* name[] = {"Carbon dioxide", "Ammonia", "Wax","Water", "Olive Oil", "Mercury", "Sulfur", "Talc", "Silver", "Copper", "Gold", "Iron", "Silicon"};
const double temp[] = {-78.5, -35.5, 45, 100.7, 300.00, 356.9, 444.6, 1,500.00, 2,212.00, 2,562.00, 2,700.00, 2,862.00, 3,280.00};
int is_substance_within_x_percent(double temp, double value);
int find_substance(double value);
int main()
{
    double obs_temp;
    printf("Enter the temperature: ");
    scanf("%lf", &obs_temp);
    double value = obs_temp;
    int index = find_substance(value);




}
int is_substance_within_x_percent(double temp, double value)
{
    temp = abs(temp);
    if((value>=temp - (0.03 * temp)) && (value <=temp + (0.03 * temp))){
        return 1;
    }
    else
        return 0;
}
int find_substance(double value)
{
    int index = 0;
    int i;
    for(i=0;i<13;i++)
    {
        if(is_substance_within_x_percent(temp[i], value) == 1){
            printf("index: %d", i);
            break;
        }

    }
    return i;
    if (is_substance_within_x_percent(temp[i], value)== -1){
        printf("No substance was found.\n");
        return 0;
    }
}

Upvotes: 0

Views: 155

Answers (1)

Bryan
Bryan

Reputation: 27

In the string temp[] change the commas for numbers in the thousands to straight numbers as well as remove any extra zeros since the array is type double, making them unnecessary (ex. 2,562.00 >>> 2562).

Also in is_substance_within_x_percent: add value = fabs(value) and change temp = abs(temp) into temp = fabs(temp) since both of these variables are double and you want the absolute value of each before calculating.

Upvotes: 1

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