Can anyone tell me what i did wrong? The program won't output the letter grade.

Code:

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#include <stdio.h>
#include <stdlib.h>

/*
Author: Linda
Source: Welcome program 
This program is to compute the output score, and the grade earned by the student. 
Date: September 21, 2011
*/

int main(void)
{
    double gradeAsg1, gradeAsg2, gradeAsg3, gradeAsg4, gradeTest1, gradeTest2, gradeExam;
    double score;
    bool inRange;
    int grade;
   
    printf("This program is to out the computed score, and the grade earned by the student.\n");
    printf("Enter Grade for assignment 1:");
    scanf("%d", &gradeAsg1);
    printf("Enter Grade for assignment 2:");
    scanf("%d", &gradeAsg2);
    printf("Enter Grade for assignment 3:");
    scanf("%d", &gradeAsg3);
    printf("Enter Grade for assignment 4:");
    scanf("%d", &gradeAsg4);
    printf("Enter Grade for Test 1:");
    scanf("%d", &gradeTest1);
    printf("Enter Grade for Test 2:");
    scanf("%d", &gradeExam);
   
    score =(gradeAsg1+gradeAsg2+gradeAsg3+gradeAsg4)/400*0.2+(gradeTest1+gradeTest2)/200*0.4+gradeExam/100*0.4;
   
    printf("%d\n", score);
     
   
/*
    if ( score >=87 && score<=100 )
        inRange = true;
    else
        inRange = false;
       
        */
    inRange=score >=87 & score <= 100;   
    if (inRange == true) printf ("A"); 
   
    if ( score >= 74 && score<=87 )
        inRange = true;
    else
        inRange = false;
       
    if (inRange == true) printf("B");
    if ( score >= 61 && score<74 )
        inRange = true;
    else
        inRange = false;
       
    if (inRange == true) printf("C");
    if( score >= 48 && score<61 )
        inRange = true;
    else
        inRange = false;
       
    if (inRange == true) printf ("D");
    if ( score >= 0 && score<48)
        inRange = true;
    else
        inRange = false;
       
    if ( inRange == true) printf("F");
    printf("grade=%c\n",grade);
   
   
    system( "Pause" );
    return 0;
    }

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You are using variables that haven't been given values yet:

Code:

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printf("This program is to out the computed score, and the grade earned by the student.\n");     
printf("Enter Grade for assignment 1:");   
scanf("%d", &gradeAsg1);   
printf("Enter Grade for assignment 2:");   
scanf("%d", &gradeAsg2);     
printf("Enter Grade for assignment 3:");     
scanf("%d", &gradeAsg3);     
printf("Enter Grade for assignment 4:");   
scanf("%d", &gradeAsg4);   
printf("Enter Grade for Test 1:");   
scanf("%d", &gradeTest1);   
printf("Enter Grade for Test 2:");   
scanf("%d", &gradeExam);         

score =(gradeAsg1+gradeAsg2+gradeAsg3+gradeAsg4)/400*0.2+(gradeTest1+gradeTest2)/200*0.4+gradeExam/100*0.4;         

printf("%d\n", score);

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Oh, thanks! I fixed the variables, but it still won't ouput the letter grade :(

Do you get any errors with your bool variable?

No, i don't get any errors, but it still won't output the grade.

try changing your double variables to floats and your scanf and print %d to %f

I am using this program from the following website. Download Dev-C++ from SourceForge.net

I try that but it didnt work. :((

This should do it for you...look at what I did and apply to your code.

Code:

---

#include <stdlib.h>
#include <stdio.h>

/*
 Author: Linda
 Source: Welcome program 
 This program is to compute the output score, and the grade earned by the student. 
 Date: September 21, 2011
 */

int main(void)
{
    int gradeAsg1, gradeAsg2, gradeAsg3, gradeAsg4, gradeTest1, gradeTest2, gradeExam;
    float score;
   
    printf("This program is to out the computed score, and the grade earned by the student.\n");
    printf("Enter Grade for assignment 1:");
    scanf("%i", &gradeAsg1);
    printf("Enter Grade for assignment 2:");
    scanf("%i", &gradeAsg2);
    printf("Enter Grade for assignment 3:");
    scanf("%i", &gradeAsg3);
    printf("Enter Grade for assignment 4:");
    scanf("%i", &gradeAsg4);
    printf("Enter Grade for Test 1:");
    scanf("%i", &gradeTest1);
    printf("Enter Grade for Test 2:");
    scanf("%i", &gradeTest2);
    printf("Enter Grade for Test 3:");
    scanf("%i", &gradeExam);
   
    float A1, A2, A3;
    A1 = ((gradeAsg1+gradeAsg2+gradeAsg3+gradeAsg4)/4)*0.2;
    A2 = ((gradeTest1+gradeTest2)/2)*0.4;
    A3 = (gradeExam)*0.4;
    score = A1 + A2 + A3;
   
    printf("Score: %.2f\n", score);
   
    if (score >=87 && score<=100 )
        printf ("Grade: A\n"); 
    if ( score >= 74 && score<=87 )
        printf("Grade: B\n");
    if ( score >= 61 && score<74 )
        printf("Grade: C\n");
    if( score >= 48 && score<61 ) 
        printf ("Grade: D\n");
    if ( score >= 0 && score<48) 
        printf("Grade: F\n");
   
    return 0;
}

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Thank you so much :) I really appreciate it :D

Why is this on the C++ board?

Agreed - moved

Quote:

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Originally Posted by rmatze

This should do it for you...look at what I did and apply to your code.

Code:

---

#include <stdlib.h>
#include <stdio.h>
...

---

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Now rmatze ... I'm guessing you think you just helped Linda out... and I note that she's even grateful.

BUT... stop and ask yourself just how much did she learn by being handed the answer? (Especially one in a programming standard her compiler doesn't support.)
Did she learn how to analyse the problem and put together code to solve it?
Did she learn how to troubleshoot and fix code with problems?
Did she learn anything new about C?

Answer to all ... No.

You may have put a smile on her face but in fact you did her no favours.

Old proverb: "If you give a man a fish, you feed him for one day. If you teach a man how to catch fish, you feed his entire village for a lifetime."

Ok... so how about we stop short circuiting people's educations...

Noted.

Quote:

---

Originally Posted by CommonTater

Now rmatze ... I'm guessing you think you just helped Linda out... and I note that she's even grateful.

BUT... stop and ask yourself just how much did she learn by being handed the answer? (Especially one in a programming standard her compiler doesn't support.)
Did she learn how to analyse the problem and put together code to solve it?
Did she learn how to troubleshoot and fix code with problems?
Did she learn anything new about C?

Answer to all ... No.

You may have put a smile on her face but in fact you did her no favours.

Old proverb: "If you give a man a fish, you feed him for one day. If you teach a man how to catch fish, you feed his entire village for a lifetime."

Ok... so how about we stop short circuiting people's educations...

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