Grade calculator question

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The purpose of this programme is to prompt the user for
category weights (of his/her grade) and then asks the user to
input his/her grades for each category. It will then it find the
grade average of each category and use them to calculate the
user's final grade average and letter grade.

What I have tried:

include<stdio.h>
int main(){
printf("Welcome to the grade Calculator!\n");
printf("This program will input your homework,quizzes,tests,and final exams and calculate your average.\n");
char input;
int i,n,g;
bool t=true;
int sum=0,sum1=0,sum2=0,sum3=0;
int average;
//Input h for homework,q for quizzes,t for tests and f for final exams.
while(t==true){
scanf("%c",&input); 
if(input=="h"){
   printf("How many homework grades are to be entered?:");
   scanf("%d",n);
   for(i=1;i<=n;i++){
    printf("Grade%d:",&g);
    scanf("%d",&g);
    sum+=g;

   }
}
if(input=="q"){
   printf("How many quizzes grades are to be entered?:");
   scanf("%d",n);
   for(i=1;i<=n;i++){
    printf("Grade%d:",&i);
    scanf("%d",&gradei);
    sum1+=gradei; 
   }
}
if(input=="t"){
   printf("How many test grades are to be entered?:");
   scanf("%d",n);
   for(i=1;i<=n;i++){
    printf("Grade%d:",&i);
    scanf("%d",&gradei);
    sum2+=gradei
   }
}
if(input=="f"){
   printf("How many final grades are to be entered?:");
   scanf("%d",n);
   for(i=1;i<=n;i++){
    printf("Grade%d:",&i);
    scanf("%d",&gradei);
    sum3+=gradei;
   }
}
printf("Do you want to input any other grade:");
scanf("%c",input);
else{
t=false;
}
}

}

Posted 25-Mar-22 5:28am

Saloni Choudhary

Updated 25-Mar-22 8:13am

v3

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3 solutions

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OriginalGriff · Answer 1 · 2022-03-25T05:33:00

While we are more than willing to help those that are stuck, that doesn't mean that we are here to do it all for you! We can't do all the work, you are either getting paid for this, or it's part of your grades and it wouldn't be at all fair for us to do it all for you.

So we need you to do the work, and we will help you when you get stuck. That doesn't mean we will give you a step by step solution you can hand in!
Start by explaining where you are at the moment, and what the next step in the process is. Then tell us what you have tried to get that next step working, and what happened when you did.

Just saying "I tried" and expecting others to do it for you isn't going to cut it.

If you are having problems getting started at all, then this may help: How to Write Code to Solve a Problem, A Beginner's Guide[^]

Dave Kreskowiak · Answer 2 · 2022-03-25T06:22:00

As a beginner, it can be difficult to see where braces line up and where they are mismatch.

Do NOT do this:

int main(){
    if(){
    }
    else{
    }
}

Do this instead:

int main()
{
    if()
    {
    }
    else
    {
    }
}

It'll make it far easier to see where you messed up your braces. You have at least one extra brace where it doesn't belong.

CPallini · Answer 3 · 2022-03-25T08:13:00

I made it 'compiling'

C

#include <stdio.h>
#include <stdbool.h>
int main()
{
  printf("Welcome to the grade Calculator!\n");
  printf("This program will input your homework,quizzes,tests,and final exams and calculate your average.\n");
  char input;
  int i,n,g;
  bool t=true;
  int sum=0,sum1=0,sum2=0,sum3=0;
  int average;
  //Input h for homework,q for quizzes,t for tests and f for final exams.
  while (t==true)
  {
    scanf("%c",&input);
    if(input=='h')
    {
      printf("How many homework grades are to be entered?:");
      scanf("%d",&n);
      for(i=1; i<=n; i++)
      {
        printf("Grade %d: ", g);
        scanf("%d",&g);
        sum+=g;
      }
    }
    if(input=='q')
    {
      printf("How many quizzes grades are to be entered?:");
      scanf("%d",&n);
      for(i=1; i<=n; i++)
      {
        printf("Grade %d:", i);
        scanf("%d",&g);
        sum1+=g;
      }
    }
    if(input=='t')
    {
      printf("How many test grades are to be entered?:");
      scanf("%d",&n);
      for(i=1; i<=n; i++)
      {
        printf("Grade %d:", i);
        scanf("%d",&g);
        sum2+=g;
      }
    }
    if(input=='f')
    {
      printf("How many final grades are to be entered?:");
      scanf("%d",&n);
      for(i=1;i<=n;i++)
      {
        printf("Grade %d:",i);
        scanf("%d", &g);
        sum3+=g;
      }
    }
    else
    {
      t = false;
    }
    if ( t )
    {
      char c;
      printf("Do you want to input any other grade:");
      while ((c = getchar()) !='\n' && c != EOF) {}
    }
  }

Then, I made it better (use data structures and functions, Luke!)

C

#include <stdio.h>
#include <stdbool.h>

struct Grade
{
  char kind;
  const char * desc;
  bool valid;
  double average;
};


double input_grade(const char * desc);

int main()
{
  struct Grade grade[] =
  {
    { 'h', "homework", false, 0.0 },
    { 'q', "quizzes",  false, 0.0 },
    { 't', "tests",  false, 0.0 },
    { 'f', "final exams", false, 0.0 },
  };
  const int GRADES = sizeof(grade)/sizeof(grade[0]);

  printf("Welcome to the grade Calculator!\n");
  printf("This program will input your homework,quizzes,tests,and final exams and calculate your average.\n");

  while (true)
  {
    char input;
    printf("please choose a grade: ");
    input = getchar();
    int g;
    for (g=0; g < GRADES; ++g)
    {
      if ( input == grade[g].kind)
        break;
    }
    if ( g == GRADES)
      break;

    grade[g].average = input_grade(grade[g].desc);
    grade[g].valid = true;
    while ((input = getchar()) != '\n' && input != EOF) {}
  }

  for (int g=0; g < GRADES; ++g)
  {
    if (grade[g].valid )
      printf("your %s average is %g\n", grade[g].desc, grade[g].average);
  }

  return 0;
}

double input_grade(const char * desc)
{
  int items;
  double average = 0.0;
  printf("how many %s grades ? ", desc);
  scanf("%d", &items);
  for (int i = 0; i < items; ++i)
  {
    printf("grade %d: ", i);
    int g;
    scanf("%d", &g);
    average += g;
  }
  if ( items )
    average /= items;
  return average;

Grade calculator question

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