Question

Write a program, which reads a list of student records from a file in batch mode. Each student record comprises a roll number and student name, and the student records are separated by commas. An example data in the file is given below.

· SP18-BCS-050 (Ali Hussan Butt), SP19-BCS-154 (Huma Khalid), FA19-BSE-111 (Muhammad Asim Ali), SP20-BSE-090 (Muhammad Wajid), SP17-BCS-014 (Adil Jameel)

The program should store students roll numbers and names separately in 2 parallel arrays named names and rolls, i.e. in the above case, 1st element of names contains “Ali Hussan Butt” and 1st element of rolls contain “SP18-BCS-321”; similarly, 2nd element of names contains “Huma Khalid” and 2nd element of rolls contain “SP19-BCS-154” and so on. Hint: You may use delimiters string “() ,”. Ignore empty strings returned as tokens (i.e. strings with length 0), if any.

In the end, first, display roll numbers and names for only the following students:

· Who are enrolled in BCS program.

· Whose roll number is between 100 and 200. (Hint: you can extract last 3 characters of roll number, convert it into integer and then check range 100-200)

For example, in the above case, only following students should be displayed.

1. SP19-BCS-154 (Huma Khalid)

NOTE: 10

1)USE C LAUNGAGE ONLY AND NO FILE HANDLING ALLOWED

2)You can use string tokenization for seprating delimeters then save roll and names in two different arrays named as student_name and student_rollno i.e Parallel arrays and then display both the arrays.

3)Again use the string tokenization to separate Programs in student_rollno(using your roll no array) with the help of strcmp() function to separate BCS students from BSE in loop and in the same loop make sure that only BCS students of roll no between 100-200 are chosen and make those roll no and student names printed.

Answer 1

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
char* cpy_str(char *source)
{
char *target=(char*)malloc(sizeof(source));
int i=0;
while(source[i]!='\0')
{
target[i]=source[i];
i++;
}
target[i]='\0';
return target;
}
int main()
{
char str[]="SP18-BCS-050(Ali Hussan Butt),SP19-BCS-154(Huma Khalid),FA19-BSE-111(Muhammad Asim Ali),SP20-BSE-090(Muhammad Wajid),SP17-BCS-014(Adil Jameel)";;
char *roll_no[100];
char *names[100];
int count=0;
char* token;
char *str_ptr=str;
char* name_ptr;
char* rno_ptr;
while ((token = strtok_r(str_ptr,",",&str_ptr)))
{
  
rno_ptr= strtok_r(token,"(",&token);
roll_no[count]=rno_ptr;
  
name_ptr= strtok_r(token,")",&token);
names[count]=name_ptr;
  
count=count+1;

}
printf("List:\n");
  
for(int i=0;i<count;i++)
{
printf("%s(%s)\n", roll_no[i],names[i]);
}
printf("BCS students of roll no between 100-200\n");
for(int i=0;i<count;i++)
{
char* token1="",*token2="",*token3="";
rno_ptr=cpy_str(roll_no[i]);
  
//printf("%s\n", rno_ptr);
token1=strtok(rno_ptr,"-");
token2=strtok(NULL,"-");
token3=strtok(NULL,"\0");
//printf("%s\n", roll_no[i]);
//printf("%s\n", token1);
//printf("%s\n", token2);
//printf("%s\n", token3);
  
if((strcmp(token2,"BCS"))==0)
{
int temp=atoi(token3);
if((temp>=100)&&(temp<=200))
{
printf("%s(%s)\n", roll_no[i],names[i]);
}
}
  

}
  
return 0;
}
OUTPUT:

List:
SP18-BCS-050(Ali Hussan Butt)
SP19-BCS-154(Huma Khalid)
FA19-BSE-111(Muhammad Asim Ali)
SP20-BSE-090(Muhammad Wajid)
SP17-BCS-014(Adil Jameel)
BCS students of roll no between 100-200
SP19-BCS-154(Huma Khalid)

Program with no strtok_r and without malloc function

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

int main()
{
char str[]="SP18-BCS-050(Ali Hussan Butt),SP19-BCS-154(Huma Khalid),FA19-BSE-111(Muhammad Asim Ali),SP20-BSE-090(Muhammad Wajid),SP17-BCS-014(Adil Jameel)";;
char *list[100];
char *roll_no[100];
char *names[100];
int count=0;
char* list_ptr;
char *str_ptr=str;

char *tk = strtok(str_ptr,",");
while (tk!=NULL)
{   
list[count]=tk;
//printf("%s\n",list[count]);
tk= strtok(NULL,",");  
count=count+1;
}
for(int i=0;i<count;i++)
{
tk = strtok(list[i],"(");
if(tk!=NULL)
{
   roll_no[i]=tk;
}
tk= strtok(NULL,")");
if(tk!=NULL)
{
   names[i]=tk;
}
}
printf("List:\n");
  
for(int i=0;i<count;i++)
{
//printf("%s\n",list[i]);
printf("%s(%s)\n", roll_no[i],names[i]);
}

printf("BCS students of roll no between 100-200\n");
for(int i=0;i<count;i++)
{
char* token1="",*token2="",*token3="";
char rno_ptr[100];
for(int j=0;roll_no[i][j]!='\0';j++)
{
   rno_ptr[j]=roll_no[i][j];
}
  

token1=strtok(rno_ptr,"-");
token2=strtok(NULL,"-");
token3=strtok(NULL,"\0");

  
if((strcmp(token2,"BCS"))==0)
{
int temp=atoi(token3);
if((temp>=100)&&(temp<=200))
{
printf("%s(%s)\n", roll_no[i],names[i]);
}
}
  

}
  
return 0;
}
OUTPUT:

List:
SP18-BCS-050(Ali Hussan Butt)
SP19-BCS-154(Huma Khalid)
FA19-BSE-111(Muhammad Asim Ali)
SP20-BSE-090(Muhammad Wajid)
SP17-BCS-014(Adil Jameel)
BCS students of roll no between 100-200
SP19-BCS-154(Huma Khalid)