C program to find marks of students for boys or girls

In C programming, we can solve problems involving array processing based on index patterns. This program calculates the sum of marks for either boys or girls, where boys' marks are stored at even indices (0, 2, 4, ...) and girls' marks are stored at odd indices (1, 3, 5, ...).

Syntax

int calculateMarks(int marks[], int n, char gender);

Algorithm

To solve this problem, we follow these steps −

• Initialize g_sum and b_sum to 0
• Iterate through the array from index 0 to n-1
• If index is odd, add marks to g_sum (girls)
• If index is even, add marks to b_sum (boys)
• Return the appropriate sum based on gender input

Example

Let us see the implementation to calculate marks based on gender −

#include <stdio.h>

int solve(int marks[], int n, char gender) {
    int g_sum = 0;  // Girls' marks sum
    int b_sum = 0;  // Boys' marks sum
    
    for(int i = 0; i < n; i++) {
        if(i % 2 != 0) {
            g_sum += marks[i];  // Odd indices for girls
        } else {
            b_sum += marks[i];  // Even indices for boys
        }
    }
    
    if(gender == 'b')
        return b_sum;
    return g_sum;
}

int main() {
    int marks[] = {8, 5, 2, 6, 7, 5, 9, 9, 7};
    int n = 9;
    char gender = 'g';
    
    printf("Marks array: ");
    for(int i = 0; i < n; i++) {
        printf("%d ", marks[i]);
    }
    printf("\nGender: %c<br>", gender);
    
    int sum = solve(marks, n, gender);
    printf("Sum of marks: %d<br>", sum);
    
    return 0;
}

Marks array: 8 5 2 6 7 5 9 9 7 
Gender: g
Sum of marks: 25

How It Works

In the given example with marks = [8,5,2,6,7,5,9,9,7] and gender = 'g':

• Boys' marks (even indices): marks[0]=8, marks[2]=2, marks[4]=7, marks[6]=9, marks[8]=7. Sum = 33
• Girls' marks (odd indices): marks[1]=5, marks[3]=6, marks[5]=5, marks[7]=9. Sum = 25
• Since gender is 'g', the function returns 25

Key Points

• Even indices (0, 2, 4, ...) represent boys' marks
• Odd indices (1, 3, 5, ...) represent girls' marks
• The modulo operator (%) determines if an index is even or odd
• Function returns the sum based on the gender parameter ('b' for boys, 'g' for girls)

Conclusion

This program efficiently separates and sums marks based on array index patterns. It demonstrates the use of modulo arithmetic to distinguish between even and odd indices for gender-based mark calculation.