Write a complete program to read student data from the standard input, sort it b

Question

Write a complete program to read student data from the standard input, sort it by last name / first name , and print out the result to standard output . The                     student data consists of a last name , first name , and a grade point average (a floating point value ). You should assume no more than 50 students.
                    
                    Note, in this exercise you will need implement your own sort-- you should not rely on an external library function to do the sort.
                    
                    SAMPLE INPUT:
                    
                    Ware Henry 87.2
                    Dantes Edmond 91.4
                    Earhart Amelia 92.6
                    
                    Given the above input the program would write the following to standard output :
                    
                    Dantes Edmond 91.4
                    Earhart Amelia 92.6
                    Ware Henry 87.2

Explanation / Answer

#include <iostream>

using namespace std;

int main(){

int n, i, j;

cin >> n;

string first[n], last[n];

float gpa[n];

for(i = 0; i < n; i++){

cin >> last[i] >> first[i] >> gpa[i];

}

for(i = 0; i - n < 0; i = i + 1){

for(j = 0; j <= i; j = j + 1){

if(last[i] < last[j]){

string ftemp = first[i];

string ltemp = last[i];

float temp = gpa[i];

first[i] = first[j];

last[i] = last[j];

gpa[i] = gpa[j];

first[j] = ftemp;

last[j] = ltemp;

gpa[j] = temp;

}

else if(last[i] == last[j] && first[i] < first[j]){

string ftemp = first[i];

string ltemp = last[i];

float temp = gpa[i];

first[i] = first[j];

last[i] = last[j];

gpa[i] = gpa[j];

first[j] = ftemp;

last[j] = ltemp;

gpa[j] = temp;

}

}

}

cout << endl;

for(i = 0; i < n; i++){

cout << last[i] << " " << first[i] <<" " << gpa[i] << endl;

}

return 0;

}

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