# Students Marks Sum – Hacker Rank Solution | HackerRank Programming Solutions | HackerRank C Solutions

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C is one of the most widely used Programming Languages. it is basically used to build Operating System. C was developed by Dennis Ritchie in 1972. Below are some examples of C Programming which might you understanding the basics of C Programming.

You are given an array of integers, marks, denoting the marks scored by students in a class.

• The alternating elements marks0marks2marks4, and so on denote the marks of boys.
• Similarly, marks1marks3marks5, and so on denote the marks of girls.

The array name marks, works as a pointer which stores the base address of that array. In other words, marks contains the address where marks0 is stored in the memory.For example, let marks = [3,2,5] and marks stores 0x7fff9575c05f. Then, 0x7fff9575c05f is the memory address of marks0.

Complete the function, `marks_summation(int* marks, char gender, int number_of_students)` which returns the total sum of:

• marks of boys if gender = b
• marks of girl if gender = g

The locked code stub reads the elements of marksalong with gender. Then, it calls the function `marks_summation(marks, gender, number_of_students)` to get the sum of alternate elements as explained above and then prints the sum.

#### Input Format

• The first line contains number_of_students, denoting the number of students in the class, hence the number of elements in marks.
• Each of the number_of_students subsequent lines contains marksi.
• The next line contains gender.

#### Constraints

• number_of_students <=10^3
• 1<=marksi<=10^3(where 0<= i< number_of_students)
• gender = g or b

#### Output Format

The output should contain the sum of all the aternate elements in marks as explained above.

```3
3
2
5
b
```

```8
```

#### Explanation 0

marks = [3,2,5] andgender = b.
somarks0+marks2 = 3+5 = 8.

```5
1
2
3
4
5
g
```

```6
```

#### Explanation 1

marks = [1,2,3,4,5] andgender = g.
so Sum = marks1+marks3 = 2+5 = 8.

```1
5
g
```

```0
```

#### Explanation 2

marks =  andgender = g.
here does marks1 not exist. so Sum = 0

`Students Marks Sum – Hacker Rank Solution`
```#include <stdio.h>
#include <string.h>
#include <math.h>
#include <stdlib.h>

//Complete the following function.

int marks_summation(int* marks, int number_of_students, char gender)
{
int sum = 0;
for (int i = (gender == 'b' ? 0 : 1); i < number_of_students; i = i + 2)
sum += *(marks + i);

return sum;
}
int main() {
int number_of_students;
char gender;
int sum;

scanf("%d", &number_of_students);
int *marks = (int *) malloc(number_of_students * sizeof (int));

for (int student = 0; student < number_of_students; student++) {
scanf("%d", (marks + student));
}

scanf(" %c", &gender);
sum = marks_summation(marks, number_of_students, gender);
printf("%d", sum);
free(marks);

return 0;
}``` 