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Here is the completed code for this problem. Comments are included, go through it, learn how things work and let me know if you have any doubts or if you need anything to change. If you are satisfied with the solution, please rate the answer. Thanks

Note: Assuming that the records in file is in below format

<PC1 name (string, containing spaces)>

<PC1 clock rate (integer)>

<PC1 memory (integer)>

<PC2 name>

..

..

..

//Code

#include<stdio.h>

#include<string.h>

//structure representing a PC

typedef struct PC{

              char name[20];

              int clock_rate;

              int memory;

              char *description;

} PC;

//method to read pc info from a file, fill the array, return the number of

//records read.

//assuming that the file is in below format

//<PC name>

//<clock speed (integer)>

//<memory (integer, in TB)>

//...

int getpcs(FILE* file, PC array[50]){

              int count=0;

              char name[20];

              int clock;

              int memory;

              //looping until EOF is encountered, reading a line including spaces

              while(fscanf(file,"%[^\n]s\n",name)!=-1){

                           //successfully read pc name, so there must be a clock rate and memory

                           //reading that also

                           fscanf(file,"%d\n",&clock);

                           fscanf(file,"%d\n",&memory);

                           //creating a PC object, filling the data

                           PC pc;

                           strcpy(pc.name,name);

                           pc.clock_rate=clock;

                           pc.memory=memory;

                           pc.description=NULL;

                           //adding to array, incrementing count

                           array[count]=pc;

                           count++;

              }

              //returning count

              return count;

}

int main(){

              //code to test the above method.

              //creating an array of PC objects

              PC array[20];

              //getting name of file to read

              printf("Enter filename: ");

              char filename[20];

              scanf("%s",filename);

              //opening file for reading

              FILE *fp=fopen(filename,"r");

              //checking if file opened correctly

              if(fp==NULL){

                           //error

                           printf("file not found\n");

                           return 0;

              }

              //reading data from file

              int count=getpcs(fp,array);

              printf("Read values:\n");

              //displaying all values in the array

              for(int i=0;i<count;i++){

                           printf("PC: %d\n",i);

                           printf("Name: %s\n",array[i].name);

                           printf("Clock rate: %d GHz\n",array[i].clock_rate);

                           printf("Memory: %d TB\n",array[i].memory);

                           printf("Description: %s\n\n",array[i].description);

              }

              return 0;

}

/*OUTPUT*/

Enter filename: pc.txt

Read values:

PC: 0

Name: Intel core i7

Clock rate: 20 GHz

Memory: 1 TB

Description: (null)

PC: 1

Name: Intel core i5

Clock rate: 3 GHz

Memory: 1 TB

Description: (null)

PC: 2

Name: Intel core i7 gen 7

Clock rate: 7 GHz

Memory: 2 TB

Description: (null)

PC: 3

Name: Intel core i3

Clock rate: 2 GHz

Memory: 1 TB

Description: (null)

/*pc.txt file used*/

Intel core i7

20

1

Intel core i5

3

1

Intel core i7 gen 7

7

2

Intel core i3

2

1