Changing Array Inside Function in C

// C Program to change an Array in function
#include <stdio.h>

// here 'm' is the formal argument
void addval(int m[])
{
    int i;
    for (i = 0; i < 5; i++) {
      
        // adding 10 value to each element
        // of an array
        m[i] = m[i] + 10;
    }
}
// here 'm' is the formal argument
void dis(int m[])
{
    int i;
    for (i = 0; i < 5; i++) {
        printf("%d ", m[i]);
    }
    printf("\n");
}

void main()
{
    int a[] = { 11, 12, 13, 14, 15 };

    printf("Array before function call\n");
    // function call
    dis(a);

    // calling addval function
    addval(a);

    printf("Array after function call\n");

    dis(a);
}

// C Program to take name as input
// and change it in function
#include <stdio.h>
#include <string.h>

// function definition body
// n is the formal argument
void change_upper(char* n)
{
    for (int i = 0; n[i] != '\0'; i++) {
        if (n[i] != ' ') {
          
            // changing the case from
            // lower to upper case
            n[i] = toupper(n[i]);
        }
    }
}

void main()
{
    char name[50];
    printf("Enter the Name :\n");
    gets(name);
    printf("The name is %s\n", name);
  
    // function call passing an array "name"
    // in the function
    change_upper(name);

    printf("The name after calling the function is %s\n", name);
}