changing data output from whole number to float two decimal places

This is a discussion on changing data output from whole number to float two decimal places within the C Programming forums, part of the General Programming Boards category; Code: #include<stdio.h> //Write a function, invoked from the main function which will allow scanning data into the array. void input(int ...

  1. #1
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    Nov 2011
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    changing data output from whole number to float two decimal places

    Code:
    #include<stdio.h>
    //Write a function, invoked from the main function which will allow scanning data into the array.
    void input(int examscores[5][4])
    {
     int i,j;
     for(i=0;i<5;i++)
     {
      for(j=0;j<4;j++)
      {
       printf("input grades of student %d for exam %d\n: ",i+1,j+1);
       scanf("%d",&examscores[i][j]);
      }
      printf("\n\n");
     }
    }
    //Write a function that will calculate and output the average (to 2 decimal places) 
    //for each student appropriately labeled.
    void average(int examscores[5][4])
    {
     int i,j;
     int sum=0;
     double avg_student;
     for(i=0;i<5;i++)
     {
      printf("Student %d's average score is\n ",i+1);
      sum=0;
      for(j=0;j<4;j++)
      {
       sum=sum+examscores[i][j];
      }
      avg_student=sum/4;
      printf("%.2f\n",avg_student);
     }
    }
    //4) Write a function that will calculate and output the average for each of the 4 exams 
    //appropriately labeled.
    void overall_average(int examscores[5][4])
    {
     int i,j;
     int sum;
     double avg;
     for(j=0;j<4;j++)
     {
      printf("\nExam %d Average: ",j+1);
      sum=0;
      for(i=0;i<5;i++)
      {
       sum=sum+examscores[i][j];
      }
      avg=sum/5;
      printf("%2f",avg);
     }
    }
     //Write a function that will output the original entry data appropriately labeled. 
    //There should be column headings for the exam number and row labels for the student number as shown:
    void output(int examscores[5][4])
    {
     int i,j;
     printf("\n  Exam 1 Exam 2 Exam 3 Exam 4");
     for(i=0;i<5;i++)
     {
      printf("\n%d   ",i+1);
      for(j=0;j<4;j++)
      {
       printf("%d \t",examscores[i][j]);
      }
     }
    }
    int main(void)
    {
            //Create a 2 dimensional array (5X4 (int type)) which can hold 4 exam scores for each of 5 students.
            int examscores[5][4];
            input(examscores);
            average(examscores);
            printf("\n");
            overall_average(examscores);
            printf("\n");
            output(examscores);
            printf("\n");
            getchar();
            return 0;
    }
    my output for these scores comes out in whole numbers. How do I get it to read out 2 decimal places to the left?

  2. #2
    Registered User whiteflags's Avatar
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    You have to use floating point numbers.

  3. #3
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    Nov 2011
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    like %2f rather than %d's or float rather and int

  4. #4
    Algorithm Dissector iMalc's Avatar
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    New Zealand
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    Yes that's half of it.
    Hint on the other half of it: sum/4 is an int, but sum/4.0f is a float
    My homepage
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