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Help! GPA C++ Program that uses 1 function and 2 logical structures.

Shadow Kurimeki (17)
GPA C++ Program that uses 1 function and 2 logical structures. This program I am working on is going to be able for students to enter A,B,C,D,F
for eight classes and it should submit them there GPA. but my problem is how to get them to have 8 different selction areas and give the output correctly does any one have a sample program for me to base this off of.
Last edited on
Shadow Kurimeki (17)


Where the part of actually calculating your GPA if have about 64 or more if statements I need to slim this down and I need help
thanks for the help in the past
Last edited on
Zhuge (4664)
I would, instead of using 64 if statements for all the possible combinations, just calculate the average yourself. Also I would consider making the grades an array of char's; it would probably make it easier to expand/understand.

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float result = 0;
for(int i = 0; i <= array_size; ++i) {
    if(grades[i] == "A") result += 4;
    else if(grades[i] == "B") // etc...
}
result /= array_size;
cout.precision(2);
cout<<"Your GPA was "<<result<<endl;

This is the first method I thought of, might not be the best but it should work. Also, you repeat if statement checks after every entry twice, so if a person enters an incorrect letter twice, then they go on to the next question anyway. You should use a while loop:

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bool cont = false;
while(!cont) {
    cout<<"Please enter your grade: ";
    cin>>char1;
    if (char1 != "A" && char1 != "B" && char1 != "C" && char1 != "D" && char1 != "F") {
    cout<<"You entered an incorrect character please re-enter your grade."<<endl;
    cont = false;
    } else cont = true;
}
Last edited on
Shadow Kurimeki (17)
Whenever I used the piece of coding is say that the bool cont was redeclared and other stuff

http://img356.imageshack.us/my.php?image=questionbr7.png
Zhuge (4664)
Remove the bool from in front of cont any times you refer to it after it has been declared. Otherwise the compiler thinks you are trying to declare a new variable.
Shadow Kurimeki (17)
This is my corrected program I looked at Zhuges code and thought about using it but I dont understand the coding could you explain it to me

My other problem is I want to be able for the user to input a no# and it take place for the letter grade

Example:
A = 100 - 90
B = 89 - 80
C = 79 - 70
D = 69 - 60
F = 59 - 0

Last edited on
Shadow Kurimeki (17)
Okay so I got some of the kinks out of it and changed the theme now my problem is how to get the average to turn into the gpa without a lot of cout statements
I included the basic gpa chart for our school district

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//*/
//  Name: Seniors
//  Copyright: J.A. Fair High School
//  Author: Truate Bearden
//  Date: 05/05/08 10:53
//  Description: This is a C++ program that displays your GPA
//  after entering the 8 grades you have
//*/


#include<iostream>
#include<string>
using namespace std;
int main()
{
    
int char1, char2, char3, char4, char5, char6, char7, char8, total; 
float average, gpa;
//Starts of with directions and the first question    
cout<<"Please enter your Grades"<<endl;
cout<<"Please enter 'A', 'B', 'C', 'D', 'F'"<<endl;



cout<<"Enter Grade 1?"<<endl;

//It will display you entered an incorrect character if you enter the incorrect
//character but will cut the next question if you enter it correctly

bool cont1 = false;
while(!cont1) {
    cout<<"";
    cin>>char1;
    if (char1 >= 100 ) 
    {
    cout<<"You entered an incorrect character please re-enter your grade."<<endl;
    cont1 = false;
    } else cont1 = true;
}


cout<<"Enter Grade 2?"<<endl;      

//It will display you entered an incorrect character if you enter the incorrect
//character but will cut the next question if you enter it correctly
bool cont2 = false;
while(!cont2) 
{
    cout<<"";
    cin>>char2;
    if (char2 >= 100 )  {
    cout<<"You entered an incorrect character please re-enter your grade."<<endl;
    cont2 = false;
    } else cont2 = true;
}


cout<<"Enter Grade 3?"<<endl;      

//It will display you entered an incorrect character if you enter the incorrect
//character but will cut the next question if you enter it correctly
bool cont3 = false;
while(!cont3) {
    cout<<"";
    cin>>char3;
    if (char3 >= 100 ) {
    cout<<"You entered an incorrect character please re-enter your grade."<<endl;
    cont3 = false;
    } else cont3 = true;
}


cout<<"Enter Grade 4?"<<endl;      

//It will display you entered an incorrect character if you enter the incorrect
//character but will cut the next question if you enter it correctly
bool cont4 = false;
while(!cont4) {
    cout<<"";
    cin>>char4;
    if (char4 >= 100 )  {
    cout<<"You entered an incorrect character please re-enter your grade."<<endl;
    cont4 = false;
    } else cont4 = true;
}

cout<<"Enter Grade 5?"<<endl;      

//It will display you entered an incorrect character if you enter the incorrect
//character but will cut the next question if you enter it correctly
bool cont5 = false;
while(!cont5) {
    cout<<"";
    cin>>char5;
    if (char5 >= 100 )  {
    cout<<"You entered an incorrect character please re-enter your grade."<<endl;
    cont5 = false;
    } else cont5 = true;
}


cout<<"Enter Grade 6?"<<endl;      

//It will display you entered an incorrect character if you enter the incorrect
//character but will cut the next question if you enter it correctly
bool cont6 = false;
while(!cont6) {
    cout<<"";
    cin>>char6;
    if (char6 >= 100 )  {
    cout<<"You entered an incorrect character please re-enter your grade."<<endl;
    cont6 = false;
    } else cont6 = true;
}

cout<<"Enter Grade 7?"<<endl;      

//It will display you entered an incorrect character if you enter the incorrect
//character but will cut the next question if you enter it correctly
bool cont7 = false;
while(!cont7) {
    cout<<"";
    cin>>char7;
    if (char7 >= 100 )  {
    cout<<"You entered an incorrect character please re-enter your grade."<<endl;
    cont7 = false;
    } else cont7 = true;
}

cout<<"Enter Grade 8?"<<endl;      

//It will display you entered an incorrect character if you enter the incorrect
//character but will cut the next question if you enter it correctly
bool cont8 = false;
while(!cont8) {
    cout<<"";
    cin>>char8;
    if (char8 >= 100 )  {
    cout<<"You entered an incorrect character please re-enter your grade."<<endl;
    cont8 = false;
    } else cont8 = true;
}


//This is the long list of all possible answers / cout statements that can occur
//With the answers you have given

cout<<"Your answers where"<<endl;
cout<<""<<endl;
cout<<char1<<" "<<char2<<" "<<char3<<" "<<char4<<" "<<char5<<" "<<char6<<" "<<char7<<" "<<char8<<endl;
cout<<""<<endl;

total = char1 + char2 + char3 + char4 + char5 + char6 + char7 + char8; 
average = (total / 8);

cout<<"Your total grade average is "<<average<<endl;

/*/if (average = );/*/

{


//All of your possible answers are insured to come out anyway you get this quiz

/*/

4.0 = 95-100
3.9	= 94
3.8	= 93
3.7	= 92
3.6	= 91
3.5	= 90
3.4	= 89
3.3	= 88
3.2	= 87
3.1	= 86
3.0 = 85
2.9	= 84
2.8	= 83
2.7	= 82
2.6	= 81
2.5	= 80
2.4	= 79
2.3	= 78
2.2	= 77
2.1	= 76
2.0 = 75
1.9	= 74
1.8	= 73
1.7	= 72
1.6	= 71
1.5	= 70
1.4	= 69
1.3	= 68
1.2	= 67
1.1	= 66
1.0 = 65
0.9	= 64
0.8	= 63
0.7	= 62
0.6	= 61
0.5	= 60
0.0 = 59

/*/

}



  system("PAUSE");
  return 0;

}
Last edited on
Shadow Kurimeki (17)
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//*/
//  Name: Seniors
//  Copyright: J.A. Fair High School
//  Author: Truate Bearden
//  Date: 05/05/08 10:53
//  Description: This is a C++ program that displays your GPA
//  after entering the 8 grades you have
//*/
#include<iostream>
#include<string>
using namespace std;
int main()
{
    
int char1, char2, char3, char4, char5, char6, char7, char8, total; 
float average, gpa;
//Starts of with directions and the first question    
cout<<"Please enter your Grades"<<endl;
cout<<"Please enter 100 - 0"<<endl;



cout<<"Enter Grade 1?"<<endl;

//It will display you entered an incorrect character if you enter the incorrect
//character but will cut the next question if you enter it correctly

bool cont1 = false;
while(!cont1) {
    cout<<"";
    cin>>char1;
    if (char1 >= 101 ) 
    {
    cout<<"You entered an incorrect character please re-enter your grade."<<endl;
    cont1 = false;
    } else cont1 = true;
}


cout<<"Enter Grade 2?"<<endl;      

//It will display you entered an incorrect character if you enter the incorrect
//character but will cut the next question if you enter it correctly
bool cont2 = false;
while(!cont2) 
{
    cout<<"";
    cin>>char2;
    if (char2 >= 101 )  {
    cout<<"You entered an incorrect character please re-enter your grade."<<endl;
    cont2 = false;
    } else cont2 = true;
}


cout<<"Enter Grade 3?"<<endl;      

//It will display you entered an incorrect character if you enter the incorrect
//character but will cut the next question if you enter it correctly
bool cont3 = false;
while(!cont3) {
    cout<<"";
    cin>>char3;
    if (char3 >= 101 ) {
    cout<<"You entered an incorrect character please re-enter your grade."<<endl;
    cont3 = false;
    } else cont3 = true;
}


cout<<"Enter Grade 4?"<<endl;      

//It will display you entered an incorrect character if you enter the incorrect
//character but will cut the next question if you enter it correctly
bool cont4 = false;
while(!cont4) {
    cout<<"";
    cin>>char4;
    if (char4 >= 101 )  {
    cout<<"You entered an incorrect character please re-enter your grade."<<endl;
    cont4 = false;
    } else cont4 = true;
}

cout<<"Enter Grade 5?"<<endl;      

//It will display you entered an incorrect character if you enter the incorrect
//character but will cut the next question if you enter it correctly
bool cont5 = false;
while(!cont5) {
    cout<<"";
    cin>>char5;
    if (char5 >= 101 )  {
    cout<<"You entered an incorrect character please re-enter your grade."<<endl;
    cont5 = false;
    } else cont5 = true;
}


cout<<"Enter Grade 6?"<<endl;      

//It will display you entered an incorrect character if you enter the incorrect
//character but will cut the next question if you enter it correctly
bool cont6 = false;
while(!cont6) {
    cout<<"";
    cin>>char6;
    if (char6 >= 101 )  {
    cout<<"You entered an incorrect character please re-enter your grade."<<endl;
    cont6 = false;
    } else cont6 = true;
}

cout<<"Enter Grade 7?"<<endl;      

//It will display you entered an incorrect character if you enter the incorrect
//character but will cut the next question if you enter it correctly
bool cont7 = false;
while(!cont7) {
    cout<<"";
    cin>>char7;
    if (char7 >= 101 )  {
    cout<<"You entered an incorrect character please re-enter your grade."<<endl;
    cont7 = false;
    } else cont7 = true;
}

cout<<"Enter Grade 8?"<<endl;      

//It will display you entered an incorrect character if you enter the incorrect
//character but will cut the next question if you enter it correctly
bool cont8 = false;
while(!cont8) {
    cout<<"";
    cin>>char8;
    if (char8 >= 101 )  {
    cout<<"You entered an incorrect character please re-enter your grade."<<endl;
    cont8 = false;
    } else cont8 = true;
}


//This is the long list of all possible answers / cout statements that can occur
//With the answers you have given

cout<<"Your answers where"<<endl;
cout<<""<<endl;
cout<<char1<<" "<<char2<<" "<<char3<<" "<<char4<<" "<<char5<<" "<<char6<<" "<<char7<<" "<<char8<<endl;
cout<<""<<endl;

total = char1 + char2 + char3 + char4 + char5 + char6 + char7 + char8; 
average = (total / 8);

cout<<"Your semester grade average is "<<average<<endl;

if (average >= 94 ){
cout<<"Your GPA is 4.0"<<endl;
}        
    
if (average >= 91 && average <= 94 ) {
cout<<"Your GPA is 3.750"<<endl;
}

if (average >= 88 && average <= 91 ) {
cout<<"Your GPA is 3.500"<<endl;
}

if (average >= 85 && average <= 88 ) {
cout<<"Your GPA is 3.250"<<endl;
}              

if (average >= 82 && average <= 85 ) {
cout<<"Your GPA is 3.0"<<endl;
}

if (average >= 79 && average <= 82 ) {
cout<<"Your GPA is 2.750"<<endl;
}

if (average >= 76 && average <= 79 ) {
cout<<"Your GPA is 2.500"<<endl;
}

if (average >= 73 && average <= 76 ) {
cout<<"Your GPA is 2.250"<<endl;
}

if (average >= 70 && average <= 73 ) {
cout<<"Your GPA is 2.0"<<endl;
}

if (average >= 77 && average <= 70 ) {
cout<<"Your GPA is 1.750"<<endl;
}

if (average >= 64 && average <= 67 ) {
cout<<"Your GPA is .1.500"<<endl;
}

if (average >= 61 && average <= 64 ) {
cout<<"Your GPA is 1.250"<<endl;
}

if (average >= 58 && average <= 61 ) {
cout<<"Your GPA is 1.00"<<endl;
}

if (average >= 55 && average <= 58 ) {
cout<<"Your GPA is 0.750"<<endl;
}

if (average >= 52 && average <= 55 ) {
cout<<"Your GPA is 0.500"<<endl;
}

if ( average <= 52 ) {
cout<<"Your GPA is 0.0"<<endl;
}
{

//All of your possible answers are insured to come out anyway you get this quiz

/*/

4.0 = 95-100
3.9	= 94
3.8	= 93
3.7	= 92
3.6	= 91
3.5	= 90
3.4	= 89
3.3	= 88
3.2	= 87
3.1	= 86
3.0 = 85
2.9	= 84
2.8	= 83
2.7	= 82
2.6	= 81
2.5	= 80
2.4	= 79
2.3	= 78
2.2	= 77
2.1	= 76
2.0 = 75
1.9	= 74
1.8	= 73
1.7	= 72
1.6	= 71
1.5	= 70
1.4	= 69
1.3	= 68
1.2	= 67
1.1	= 66
1.0 = 65
0.9	= 64
0.8	= 63
0.7	= 62
0.6	= 61
0.5	= 60
0.0 = 59

/*/

}



  system("PAUSE");
  return 0;

}
Zaita (2770)
Argghhh. You should simplify your code. 260 lines is too many. If you simplify your code it will be easier for you to find problems and solutions.

I have coded up a small sample that will read in the results, and display them back to your. Including the total. This is a good starting point that will help you reduce your application to something more maintainable.

Try something like this:
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#include <iostream>

using namespace std;

int main() {
 int nuOfResults = 8;
 int resultsList[nuOfResults];

 cout<<"Please enter your Grades"<<endl;
 cout<<"Please enter 100 - 0"<<endl;
 
 // Loop 1-nuOfResults to read them in
 for (int i = 0; i < nuOfResults; ++i) {
   cout << "Enter grade " << (i+1) << ": ";   
   
   while(true) {
     int iTemp;
     cin>>iTemp;
     if ( (iTemp > 100 ) || (iTemp < 0) )
       cout<<"You entered an incorrect character please re-enter your grade."<<endl;
     else {
       resultsList[i] = iTemp;
       break;
     }         
   }
 }  
 
 // Now, We have a list of results.
 cout << "Your Results Were:" << endl;
 int iTotal = 0;
 for (int i = 0; i < nuOfResults; ++i) { 
   cout << "For Grade " << (i+1) << " the score was " << resultsList[i] << endl;
   iTotal += resultsList[i];
 }
 cout << "Total Score Was: " << iTotal << endl;

 return 0;
}
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