Answer to Question #224508 in C++ for lord

Question

Write a program to input name, roll number and marks in 5 subjects for n number of students using structure. Write functions to: -

a.   Find total marks and percentage of all n students.

b.   Display details of a student with a given roll number.

c.   Display the details for all the students having percentage in a given 

     range.

d.   Sort the array in ascending order of marks.

Answer 1

#include<stdio.h>
#include<conio.h>




struct Student{
	char name[30];
	int rollNumber;
	int marks[5];
	int totalMarks; 
	float percentage;
}; 


//a.   Find  total  marks  and  percentage  of  all  n  students.
void findTotalMarksPercentageStudents(struct Student students[],int numberStudents){
	int i,m;
	for(i=0;i<numberStudents;i++){
		students[i].totalMarks=0;
		students[i].percentage=0.0;
		for(m=0;m<5;m++){
			students[i].totalMarks+=students[i].marks[m];
			students[i].percentage+=students[i].marks[m]*0.2;
		}
	}
}


//b.   Display  details  of  a  student  with  a  given  roll  number.
void displayDetailsStudent(struct Student students[],int numberStudents,int rollNumber){
	int i,m;
	for(i=0;i<numberStudents;i++){
		if(rollNumber==students[i].rollNumber){
			printf("The student's name: %s\n",students[i].name);
			printf("The student's roll number: %d\n",students[i].rollNumber);
			printf("The student's marks\n");
			for(m=0;m<5;m++){
				printf("%d ",students[i].marks[m]);
			}
			printf("\nThe student's total marks: %d\n",students[i].totalMarks);
			printf("The student's percentage: %.2f\n",students[i].percentage);
			printf("\n");
			break;
		}
	}
}
//c.   Display  the  details  for  all  the  students  having  percentage  in  a  given range.
void displayDetailsSudentsPercentageRange(struct Student students[],int numberStudents,float percentage1,float percentage2 ){
	int i,m;
	for(i=0;i<numberStudents;i++){
		if(students[i].percentage>=percentage1 && students[i].percentage<=percentage2){
			printf("The student's name: %s\n",students[i].name);
			printf("The student's roll number: %d\n",students[i].rollNumber);
			printf("The student's marks\n");
			for(m=0;m<5;m++){
				printf("%d ",students[i].marks[m]);
			}
			printf("\nThe student's total marks: %d\n",students[i].totalMarks);
			printf("The student's percentage: %.2f\n",students[i].percentage);
			printf("\n");
		}
	}
}
//d.   Sort  the  array  in  ascending order of marks.
void  sortArrayInAscendingOrderMark(struct Student students[],int numberStudents){
	int i,j,m;
	for (i = 0; i < numberStudents - 1; i++){
		for (j = 0; j < numberStudents - i - 1; j++){
			if (students[j].totalMarks > students[j + 1].totalMarks)
			{
				// swap temp and elements[i]
				struct Student temp = students[j];
				students[j] = students[j + 1];
				students[j + 1] = temp;
			}
		}
	}
	
	for(i=0;i<numberStudents;i++){
		printf("The student's name: %s\n",students[i].name);
		printf("The student's roll number: %d\n",students[i].rollNumber);
		printf("The student's marks\n");
		for(m=0;m<5;m++){
			printf("%d ",students[i].marks[m]);
		}
		printf("\nThe student's total marks: %d\n",students[i].totalMarks);
		printf("The student's percentage: %.2f\n",students[i].percentage);
		printf("\n");
	}
}


void main()
{
	struct Student students[100];
	int numberStudents,i,m;
	int rollNumber;
	float percentage1;
	float percentage2;
	printf("Enter the number of students: ");
	scanf("%d",&numberStudents);
	
	for(i=0;i<numberStudents;i++){
		fflush(stdin);
		printf("Enter the student's name: ");
		gets(students[i].name);
		printf("Enter the student's roll number: ");
		scanf("%d",&students[i].rollNumber);
		for(m=0;m<5;m++){
			printf("Enter the student's mark %d: ",(m+1));
			scanf("%d",&students[i].marks[m]);
		}
		printf("\n");
	}
	findTotalMarksPercentageStudents(students,numberStudents);
	printf("Enter the student's roll number to search: ");
	scanf("%d",&rollNumber);
	displayDetailsStudent(students,numberStudents,rollNumber);
	
	printf("Enter the student's percentage 1 to search: ");
	scanf("%f",&percentage1);
	printf("Enter the student's percentage 2 to search: ");
	scanf("%f",&percentage2);
	displayDetailsSudentsPercentageRange(students,numberStudents,percentage1,percentage2);
	
	printf("\nSort  the  array  in  ascending order of marks.\n");
	sortArrayInAscendingOrderMark(students,numberStudents);
	printf("\n");
}