Question

Using c programming language

How do you put data from a text file into a 2d array

For example a text file with names and age:

john 65

sam 34

joe 35

sarah 19

jason 18

max 14

kevin 50

pam 17

bailey 38

one 2d array should have all the names from the file and one 2d array should have all the ages and both arrays should be printed out separately and be 3x3

Answer 1

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
int main()
{
   FILE *fp;
   int r;
   //open the input file
   fp = fopen("input.txt", "r");
   char name[100];
   int age;
   //create the arrays
   char names[9][100];
   int ages[9];
   int i = 0;
   //read the file line by line
   while((r = fscanf(fp, "%s %d", name, &age) != EOF))
   {
       //store the name into the array
       strcpy(names[i], name);
       //sotre the age into the array
       ages[i] = age;
       i++;
   }
   //printing all the names in the array
   printf("Names:\n");
   //iterate over the array
   for(int i = 0;i < 9;i++)
   {
       //print the names
       printf("%s\n", names[i]);
   }
   //printing all the names in the array
   printf("Ages:\n");
   //iterate over the array
   for(int i = 0;i < 9;i++)
   {
       //print the ages
       printf("%d\n", ages[i]);
   }
}