Program to calculate students marks, C/C++ Programming

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#include
using namespace std;
void print(int marks_arr[],int cnt)
{
int ind[cnt];
int i=0;
int j=0;
int k=0;
int s=0;
for(k=0;k {
ind[k]=0;
}
int cnt1=0;
for(i=0;i {
ind[cnt1]=1;
for(j=i+1;j {
//cout< if((marks_arr[i]==marks_arr[j])&&(marks_arr[i]!=-1))
{
ind[cnt1]=ind[cnt1]+1;
marks_arr[j]=-1;
//if(marks_arr[j]==-1)
//{
//break;
//}

}
}
cnt1++;
}
for(s=0;s {
if(marks_arr[s]!=-1)
{
cout<<"\n"< }

}

}
int add()
{
int mark;
cout<<"Enter the mark:";
cin>> mark;
return mark;
}
float avg(int mark[],int c)
{
int i,sum=0;
float average;
for(i=0;i {
sum= sum+mark[i];
}
average=sum/c;
return average;
}

int marks_arr[100];
int main()
{
static int count=0;
//int marks_arr[100],
int choice,i,ch,searchelement,totalcount,total;
float val;

do
{
cout<<"\n 1. Add student marks";
cout<<"\n 2. Display student marks";
cout<<"\n 3. Find average of all marks";
cout<<"\n 4. Calculate the standard deviation";
cout<<"\n 5. Delete a student mark";
cout<<"\n 6. Search all marks ";
cout<<"\n 7. Print all marks";
cout<<"\nEnter choice : ";
cin>>choice;
switch(choice)
{
case 1:
{
marks_arr[count]=add();
count++;
break;
}
case 2:
{
for(i=0;i {
cout< }
break;
}

case 3:
{
val= avg(marks_arr,count);
cout<< "The avg of total marks is: "< break;
}
case 4:

case 5:


case 6:
{
cout<<"\n Enter the mark to search:";
cin>>searchelement;
totalcount=0;
for(i=0;i {
if(marks_arr[i]==searchelement)
{
totalcount=totalcount+1;
}
}
cout<<"No of times the element is present : "< break;
}
case 7:
{
print(marks_arr,count);
}
}
cout<<"\nContinue [0-yes / 1-no] :";
cin>>ch;
}while(ch!=1);
}


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