Students Result-Report

This is C code for 'Students Result-Report' assignment of Data Structures (SPPU SE SEM-3) - CS of Savitribai Phule Pune University - Gyaani Buddy

#include<stdio.h>

void main()
{
    printf(" ------------- STUDENT PROFILE SYSTEM -----------------\n");
    
	int marks[20],n,i,m=0,max=0,cnt=0,flag=0,count[50],maxm=0,z,ch,h;
	char choice[1],y;
	
	printf("Enter the number of students : ");
	scanf("%d",&n);
	
	if(n>20)
    {
        printf("ERROR:\n\tThe number entered exceeds the LIMIT\n\tMaximum number to be entered is 20\n\tPLEASE RE-ENTER NUMBER OF STUDENTS:");
        scanf("%d",&n);

    }
    
	printf("enter marks of students and enter ' -1 ' as marks for absent students:\n");

	for(i=0;i<n;i++)
	{
	    	printf(" Roll no. %d: ",i+1);
		scanf("%d",&marks[i]);
		
		if(marks[i]!=-1)
		{
			m=m+marks[i];
			flag++;
		}

	}
	
	 if(flag==0)
	    {
	    	printf("ERROR:\n\tNO STUDENTS ARE PRESENT\n\t");
	    }
    	else
    {


	label:printf("\n 1: TO DISPLAY The AVERAGE of marks of students NOT considering absent students \n 2:  TO display The AVERAGE of marks of students considering absent students \n 3: For obtaining MAXIMUM marks \n 4: for obtaining MINIMUM marks \n 5: for obtaining number of absent students with their roll numbers \n 6: to display marks obtained by maximum students \n");
	printf(" Enter your Choice:");
	scanf("\n %d",&ch);

    switch(ch)
    {


        case 1:
        {

            printf(" \nThe AVERAGE of marks of students NOT considering absent students is: %d",m/flag);
        }
        break;
        
        case 2:
        {
            printf("\n The AVERAGE of marks of students considering absent students is: %d",m/n);
        }
        break;
        
        case 3:
        {
            for(i=0;i<n;i++)
            {
                if(max<marks[i])
                {
                    max=marks[i];
                }

       		}
        printf(" \nThe MAXIMUM mark among students is %d",max);
        }
        break;
        
        case 4:
        {
            int min=100;
            for(i=0;i<n;i++)
            {
                if(marks[i]!=-1)
                {
                    if(min>marks[i])
                    {
                        min=marks[i];		//note the diference
                    }
                }
            }
        printf(" \nThe MINIMUM mark among students is %d",min);
        }
        break;
        
        case 5:
        {
            printf(" \nlist of roll-numbers of absent students are : ");
            for(i=0;i<n;i++)
            {
                if(marks[i]==-1)
                {
                    printf("%d  ",i+1);
                    cnt++;
                }

            }
            printf("\n the number of absent students is : %d ",cnt);
        }
        break;
        
        case 6:
        {
                for(i=0;i<n;i++)		//frequency measurement.
                {
                    count[i]=0;
                    for(z=0;z<n;z++)
                    {
                        if(marks[i]==marks[z])
                        {
                            count[i]++;
                        }
                    }
                }
                
        		for(i=0;i<n;i++)		
        		{
            		if(marks[i]!=-1)
                	{
                    	if(maxm<count[i])
                    	{
                        maxm=count[i];
                        h=i;
                    	}	
                	}
        		}

        printf(" The marks obtained by maximum number of students is %d \n and is obtained by %d students",marks[h],maxm);
        }
        break;
        
        default:
        {
            printf(" the entered choice is not valid");
        }
    }
    
    printf("\n DO YOU WANT TO RE-ENTER CHOICE(Y/N):");
    scanf("%s",choice);
    
	if(choice[0]==121||choice[0]==89)
    {
        goto label;
    }

    }

}