how to pass an array into an function and in the function count how many numbers are in a range? [closed]

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center. Closed 9 years ago.

    #include <iostream>
    #include <fstream>
    using namespace std;
    int calculate_total(int exam1[], int exam2[], int exam3[]); // function that calcualates grades to see how many 90,80,70,60

    int exam1[100];// array that can hold 100 numbers for 1st column
    int exam2[100];// array that can hold 100 numbers for 2nd column
    int exam3[100];// array that can hold 100 numbers for 3rd column 

// here i am passing an array into the function calcualate_total
    int calculate_total(exam1[],exam2[],exam3[])
    {
     int above90=0, above80=0, above70=0, above60=0;
     if((num<=90) && (num >=100))
     {
      above90++;
      {
       if((num<=80) && (num >=89))
       {
        above80++;
        {
         if((num<=70) && (num >=79))
         {
          above70++;
          {
           if((num<=60) && (num >=69))
           {
            开发者_如何学Pythonabove60++;
           }
          }
         }
        }
       }
      }
     }
    }

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Instead of using nested if. Use if, else if and else. Your program will be clean and will help others read better.

Looks like you are trying to create a frequency table. Unfortunately, the code for the logic is wrong. When you use && AND It means it must satisfy both conditions. How can a number be less than or equal to 90 and greater than or equal to a 100 at the same time? May be what you are looking for is || which is OR.

And finally you need a loop.

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By the pointer to int array. (here is definition)

int calculate_total(int *exam1, int *exam2, int *exam3)

If you want call this function, you must in each argument push the address of examX array starting. If you want get element, you must add to the staring array address, a element offset address and get value from her.

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use a vector. you can initialize a vector like an array. the vector has a method to give you the number of elements