Updating specific elements in C array - c

Question

I'm having trouble conceptualising how to go about some of my code.
My C program wishes to compare each individual element of an array of structs aka arr_person[i].name against a user's input to see if there's a match. (i.e. if the user types in "Billy" and "Billy" is also a string in arr_person[].name array)
for(i=0;i<num_of_lines;i++)
{
if(strcmp(nameInput, arr_person[i].name)==0) {
printf("Match at element %d\n", i);
}
}
Then, a separate function finds reoccurring elements within arr_person[i].name by iterating through the array, and if the same name occurs twice, it will take the corresponding integer values of the same elemental positions and will add them up and store in new variable newChange. For example, if "Billy" occurs twice in the array, at arr_person[0].name and arr_person[4].name, and arr_person[0].number = 15 and arr_person[4].number = 10, then I want to update the number such that it becomes 25.
for(i = 0; i < num_of_lines; i++) {
for(j=0;j<num_of_lines;j++) {
if(strcmp(arr_person[j].name, arr_person[i].name)==0)
*newNumber = arr_person[i].number + arr_person[j].number;
}
}
How do I go about this so that any elements in the array that don't reoccur are still kept the same?
If the user inputs "Rachel" and Rachel only appears once in the array, and her corresponding number is 85, I want to print
Rachel 85
But if the user inputs "Billy" and Billy occurs twice, and he has the two numbers 10 and 15 as corresponding integers in another array, I want to print
Billy 25
I've only been programming for a few months. Thanks in advance.

Answer 1

Seems like the only thing you need to do is this:
int sum = 0;
for(int i=0;i<num_of_lines;i++)
{
if(strcmp(nameInput, arr_person[i].name)==0)
sum += arr_person[i].number;
}
I would structure it like this:
// Previous code from your post slightly modified to function
// returns -1 on no match and index otherwise
int match(struct person *arr_person, char *nameInput, int num_of_lines)
{
for(int i=0;i<num_of_lines;i++) {
if(strcmp(nameInput, arr_person[i].name)==0)
return i;
}
return -1;
}
int sum(struct person *arr_person, char *nameInput, int num_of_lines)
{
int sum = 0;
for(int i=0;i<num_of_lines;i++) {
if(strcmp(nameInput, arr_person[i].name)==0)
sum += arr_person[i].number;
}
return sum;
}
int main()
{
// Insert code for declaration and initialization
int index = match(arr_person, nameInput, num_of_lines);
if(index >= 0) {
printf("Match at element %d\n", index);
printf("%s %d\n", nameInput, sum(arr_person, nameInput, num_of_lines));
} else {
printf("No match\n");
}
}