Thread: c prog. reading student with highest avg marks,name and student id

The code i made is used to read a .txt file and retrieve the largest integer. But im having trouble on how i can make the code read student name and id for student with high avg marks.

in the txt file there will
Roll no. Name mark

example:
190 james 100

i would really appreaciate if you guys could help me out. thank you.

Code:

#include<stdio.h>
#include<conio.h>
#include<stdlib.h>
#include <stdio.h>
int main()
{
    FILE *sensor;
    int num,max, sum, count, first;


        sensor = fopen("C:\\Users\\SMLUser\\Desktop\\test.txt", "r");
        if (sensor != NULL)
        {
            for (sum = count = first = 0;
            fscanf(sensor, "%d", &num) == 1; sum += num, ++count)
                if (!first)
                {
                    max = num; first = 1;
                }
                else if (num > max) max = num;
                
            fclose(sensor);
            printf("max = %d \n",max);
        }
        else
        {
            printf("Unable to read file 'C:\\Users\\SMLUser\\Desktop\\test.txt" );
        }
    getch();
}

Code:

for (sum = count = first = 0;

what does this line do?

it supposed to calculate the sum

This is your code:

Code:

#include<stdio.h>
//#include<conio.h>
#include<stdlib.h>
#include <stdio.h>
int main()
{
    FILE *sensor;
    int num,max, sum, count, first;
 
 
        sensor = fopen("C:\\Users\\SMLUser\\Desktop\\test.txt", "r");
        if (sensor != NULL)
        {
            /* for */
            for (sum = count = first = 0;fscanf(sensor, "%d", &num) == 1; sum += num, ++count); if (!first)
                {
                    max = num; first = 1;
                }
                else if (num > max) max = num;
           /* end-for */
                 ; /* Do nothing */
                
            fclose(sensor);
            printf("max = %d \n",max);
        }
        else
        {
            printf("Unable to read file 'C:\\Users\\SMLUser\\Desktop\\test.txt" );
        }
  //  getch();
}

The format for a for statement is for ( clause-1 ; expression-2 ; expression-3 ) statement;

What are clause-1, expression-2, expression-3 and statement in your code?

I was able to update the code but now im getting random number at the end of reading the file.

Code:

void fileprint(){
  int c;
        struct student{
               long id;
               char name[20];
                int mid1;
  };
		int i;
        struct student x[20];
        FILE *file;
        file=fopen("student.txt","r");
		system("cls");
 if(file==NULL){
	printf("Can not open the file\n"); 
    		exit(-1);
}
for(i=0;i<10;i++)
{ 
fscanf(file,"%d %s %d\n",&x[i].id,x[i].name,&x[i].mid1);
printf ("%d %s %d\n",x[i].id,x[i].name,x[i].mid1);
}


fclose(file);
getch();	
}

hi laserlight the content of the file has 2 integers and one string

please see the example below:

Roll no. Student Name Mark
109 James 90

so i need the code to get the highest mark from the listed records.

the txt file could have more than 1000 entries.

Thank you for replying laserlight.

Actually the number of records are random depending on the records inserted by the user.

oh i see in that case it would be 100 entries maximum the user are permitted to enter.

hi laserlight can you advise how i can make the code get the highest avg from the list of records? i would really appreciate if you could guide me.

I have updated the code to read the txt file. but i need to get the highest mark from the list of students

can you advise on how i can achieve that?

Code:

void readfile()
{   
int c;
struct student
{
long id;
char name[20];
int mid1;
};
      
		
        struct student x[100];
		 
        FILE *file;
		 int i;
		 i=0;
		
        file=fopen("student.txt","r");
        system("cls");
		 i=0;
   while((fscanf(file, "%ld %s %d\n",&x[i].id,x[i].name,&x[i].mid1)) == 3) 
   {
      printf("%ld %s %d\n",x[i].id,x[i].name,x[i].mid1);
      ++i;


   }
   printf("\n\n\nPRESS ANY KEY TO EXIT");
		
		getch();
		
		
fclose(file);
}