# C Exercises: Calculate the average marks of mathematics of some students

## C Basic Declarations and Expressions: Exercise-44 with Solution

Write a C program to calculate the average mathematics marks of some students. Input 0 (excluding to calculate the average) or a negative value to terminate the input process.

**Pictorial Presentation:**

**Sample Solution:**

**C Code:**

```
#include <stdio.h>
int main() {
int marks[99], m, i, a=0, total=0;
float f;
// Prompt for user input
printf("Input Mathematics marks (0 to terminate): ");
// Loop to get input marks
for(i = 0; ; i++) {
scanf("%d", &marks[i]);
if(marks[i] <= 0) {
break;
}
a++;
total += marks[i];
}
// Calculate and print average
f = (float)total/(float)a;
printf("Average marks in Mathematics: %.2f\n", f);
return 0;
}
```

Sample Output:

Input Mathematics marks (0 to terminate): 10 15 20 25 0 Average marks in Mathematics: 17.50

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**Next:** Write a C program to calculate the value of S where S = 1 + 1/2 + 1/3 + … + 1/50.

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