How to find who is younger from a list of person's age given in a text file using C?

Question

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A text file contains a list of names,age and gender of 10 people.You are required to find who has the the minimum age and print the same.
Contents of a text file:

suresh		10	male 
ram		20	male
sita		20	female
paresh		25	male
anish		18	male
rajasree	30	female
gita		35	female
asutosh		28	male
shubham		21	male
suman		39	male

Output:
Suresh is the youngest whose age is 10

What I have tried:

Unfinished code:

C++

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include<ctype.h>
int i,j,temp;
struct
{
    char name[40];
    int age;
    char sex[10];
}person[9];
void main()
{
    FILE *fp;
    fp=fopen("candidate.txt","r");
    char a[10];
    int val;
    if((fp=fopen("candidate.txt","r"))==NULL)
        {
            printf(" ! The File is Empty...\n\n");
        }
    char ch;
    for(i=0;i<10;i++)
    {
     do
     {
        fscanf(fp,"%s %d %s",person[i].name,&person[i].age,person[i].sex);
        while((ch=fgetc(fp))!='\n')
        {
         if(isdigit(ch)!=0 || isspace(ch)!=0)
           {
            if(fscanf(fp,"%d",&person[i].age)==ch)
            {
              for(j=i+1;j<10;j++)
               a[i]=ch;
               if(a[i]<a[j])
               {
                   temp=i;
               }
             //printf("%d",c);
           }
           }
        }
     }while((fgetc(fp))!=EOF);
      /*for(i=0;i<10;i++)
        printf("%d ",person[i].age);*/
     }
    printf("Minimum age is:%d",temp);
}

Posted 25-Jun-18 21:40pm

Member 13887243

Updated 25-Jun-18 22:53pm

Kornfeld Eliyahu Peter

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Kornfeld Eliyahu Peter · Accepted Answer · 2018-06-25T21:50:00

Solution 1

1. Read the file into an array of structs: Read file into array of structs - C example[^]
2. Sort the array: qsort, qsort_s - cppreference.com[^]
3. Pick the first item...

Posted 25-Jun-18 21:50pm

Kornfeld Eliyahu Peter

Comments

Member 13887243 26-Jun-18 3:51am

Thank you for your help.

CPallini · Accepted Answer · 2018-06-25T22:55:00

You don't need to collect the items (i.e. you don't need the array), you find the minimum aged person on the fly:
(beware, the following code must be improved for reliability)

C

#include <stdio.h>
#include <string.h>
#include <limits.h>

struct Person
{
  char name[40];
  int age;
  char sex[10];
};


int  main()
{

  struct Person current, youngest;

  youngest.age = INT_MAX;

  FILE *fp;

  int rc = -1;

  fp = fopen("candidate.txt","r");

  if ( ! (fp =fopen("candidate.txt","r")))
  {
    printf("Unable to open the input file...\n\n");
    return -1;
  }

  for(;;)
  {
    int rc = fscanf(fp,"%s %d %s", current.name, ¤t.age, current.sex);
    if ( rc != 3 ) break;
    if ( youngest.age > current.age )
    {
      youngest.age = current.age;
      strcpy(youngest.name, current.name);
      strcpy(youngest.sex, current.sex);
    }
  }

  if ( youngest.age != INT_MAX)
  {
    printf("%s is the yougest whose age is %d\n", youngest.name, youngest.age);
    rc = 0;
  }
  else
  {
    printf("Unable to retrieve data from the file\n");
  }
  fclose(fp);
  return rc;
}