使用嵌套 If Else 为学生分配成绩的程序

给定一个整数数组mark ，其中包含学生在不同科目中的得分（满分 100 分），任务是为学生分配一个成绩。成绩是通过计算学生得分的百分比来确定的。百分比计算如下：

使用以下规则分配等级：

Percentage	Grade
90 and above	A
80 to 89	B
60 to 79	C
33 – 59	D
below 33	F

例子：

Input: marks = { 25, 65, 46, 98, 78, 65 } 
Output: C
Input: marks = { 95, 88, 98, 93, 92, 96 } 
Output: A 
 

方法：

• 初始化一个变量，将学生得分的所有分数相加，总计为 0。
  
• 初始化一个变量来存储学生的成绩，成绩为'F'。
  
• 首先，我们遍历标记数组并找到学生的总分。
  
• 然后，我们应用上述公式来计算百分比。
  
• 然后我们创建一个嵌套的 if else 构造来为学生分配适当的成绩。
  

有关决策制定和不同类型的决策制定结构的更多信息，请参阅Java中的决策制定。
下面是上述方法的实现：

C++

// CPP program to assign grades to a student
// using nested if-else
#include
using namespace std;
 
int main()
{
 
    // Store marks of all the subjects in an array
    int marks[] = { 25, 65, 46, 98, 78, 65 };
 
    // Max marks will be 100 * number of subjects
    int len = sizeof(marks) / sizeof(marks[0]);
    int max_marks = len * 100;
 
    // Initialize student's total marks to 0
    int total = 0;
 
    // Initialize student's grade marks to F
    char grade = 'F';
 
    // Traverse though the marks array to find the sum.
    for (int i = 0; i < len; i++)
    {
        total += marks[i];
    }
 
    // Calculate the percentage.
    // Since all the marks are integer,
    // typecast the calculation to double.
    double percentage = ((double)(total) / max_marks) * 100;
 
    // Nested if else
    if (percentage >= 90)
    {
        grade = 'A';
    }
    else
    {
        if (percentage >= 80 && percentage <= 89)
        {
            grade = 'B';
        }
        else
        {
            if (percentage >= 60 && percentage <= 79)
            {
                grade = 'C';
            }
            else
            {
                if (percentage >= 33 && percentage <= 59)
                {
                    grade = 'D';
                }
                else
                {
                    grade = 'F';
                }
            }
        }
    }
    cout << (grade) << endl;;
}
 
// This code is contributed by
// Surendra_Gangwar

Java

// Java program to assign grades to a student
// using nested if-else
 
class GFG {
    public static void main(String args[])
    {
 
        // Store marks of all the subjects in an array
        int marks[] = { 25, 65, 46, 98, 78, 65 };
 
        // Max marks will be 100 * number of subjects
        int max_marks = marks.length * 100;
 
        // Initialize student's total marks to 0
        int total = 0;
 
        // Initialize student's grade marks to F
        char grade = 'F';
 
        // Traverse though the marks array to find the sum.
        for (int i = 0; i < marks.length; i++) {
            total += marks[i];
        }
 
        // Calculate the percentage.
        // Since all the marks are integer,
        // typecast the calculation to double.
        double percentage
            = ((double)(total) / max_marks) * 100;
 
        // Nested if else
        if (percentage >= 90) {
            grade = 'A';
        }
        else {
            if (percentage >= 80 && percentage <= 89) {
                grade = 'B';
            }
            else {
                if (percentage >= 60 && percentage <= 79) {
                    grade = 'C';
                }
                else {
                    if (percentage >= 33 && percentage <= 59) {
                        grade = 'D';
                    }
                    else {
                        grade = 'F';
                    }
                }
            }
        }
 
        System.out.println(grade);
    }
}

Python3

# Python3 program to assign grades
# to a student using nested if-else
 
if __name__ == "__main__":
 
    # Store marks of all the subjects
    # in an array
    marks = [25, 65, 46, 98, 78, 65 ]
 
    # Max marks will be 100 * number
    # of subjects
    max_marks = len(marks)* 100
 
    # Initialize student's total
    # marks to 0
    total = 0
 
    # Initialize student's grade
    # marks to F
    grade = 'F'
 
    # Traverse though the marks array
    # to find the sum.
    for i in range(len(marks)):
        total += marks[i]
 
    # Calculate the percentage.
    # Since all the marks are integer,
    percentage = ((total) /max_marks) * 100
 
    # Nested if else
    if (percentage >= 90):
        grade = 'A'
         
    else :
        if (percentage >= 80 and
            percentage <= 89) :
            grade = 'B'
             
        else :
            if (percentage >= 60 and
                percentage <= 79) :
                grade = 'C'
                 
            else :
                if (percentage >= 33 and
                    percentage <= 59) :
                    grade = 'D'
                     
                else:
                    grade = 'F'
         
    print(grade)
 
# This code is contributed by ita_c

C#

// C# program to assign grades to a student
// using nested if-else
using System;
 
class GFG
{
public static void Main()
{
 
    // Store marks of all the subjects
    // in an array
    int []marks = { 25, 65, 46, 98, 78, 65 };
 
    // Max marks will be 100 * number
    // of subjects
    int max_marks = marks.Length * 100;
 
    // Initialize student's total marks to 0
    int total = 0;
 
    // Initialize student's grade marks to F
    char grade = 'F';
 
    // Traverse though the marks array to
    // find the sum.
    for (int i = 0; i < marks.Length; i++)
    {
        total += marks[i];
    }
 
    // Calculate the percentage.
    // Since all the marks are integer,
    // typecast the calculation to double.
    double percentage = ((double)(total) /
                                  max_marks) * 100;
 
    // Nested if else
    if (percentage >= 90)
    {
        grade = 'A';
    }
    else
    {
        if (percentage >= 80 && percentage <= 89)
        {
            grade = 'B';
        }
        else
        {
            if (percentage >= 60 && percentage <= 79)
            {
                grade = 'C';
            }
            else
            {
                if (percentage >= 33 && percentage <= 59)
                {
                    grade = 'D';
                }
                else
                {
                    grade = 'F';
                }
            }
        }
    }
 
    Console.WriteLine(grade);
}
}
 
// This code is contributed by Ryuga

PHP

= 90)
{
    $grade = 'A';
}
else
{
    if ($percentage >= 80 && $percentage <= 89)
    {
        $grade = 'B';
    }
    else
    {
        if ($percentage >= 60 && $percentage <= 79)
        {
            $grade = 'C';
        }
        else
        {
            if ($percentage >= 33 && $percentage <= 59)
            {
                $grade = 'D';
            }
            else
            {
                $grade = 'F';
            }
        }
    }
}
 
echo $grade . "\n";
 
// This code is contributed by Akanksha Rai
?>

Javascript

 
// Javascript program to assign grades to a student
// using nested if-else
 
// Store marks of all the subjects in an array
let marks=[25, 65, 46, 98, 78, 65];
 
// Max marks will be 100 * number of subjects
let max_marks = marks.length * 100;
 
 // Initialize student's total marks to 0
let total = 0;
 
// Initialize student's grade marks to F
        let grade = 'F';
   
        // Traverse though the marks array to find the sum.
        for (let i = 0; i < marks.length; i++) {
            total += marks[i];
        }
   
        // Calculate the percentage.
        // Since all the marks are integer,
        // typecast the calculation to double.
        let percentage
            = ((total) / max_marks) * 100;
   
        // Nested if else
        if (percentage >= 90) {
            grade = 'A';
        }
        else {
            if (percentage >= 80 && percentage <= 89) {
                grade = 'B';
            }
            else {
                if (percentage >= 60 && percentage <= 79) {
                    grade = 'C';
                }
                else {
                    if (percentage >= 33 && percentage <= 59) {
                        grade = 'D';
                    }
                    else {
                        grade = 'F';
                    }
                }
            }
        }
   
        document.write(grade);
 
 
// This code is contributed by rag2127

输出：

C