Is there perhaps some other, better way to do it? Perhaps one with which clang doesn't give me "unused result" warnings?

MODS: If you deem it inappropriate for me to continuously ask for guidance here, please let me know. 😊

#include <stdio.h>  

void executechoice(int choice);		
void printsavedpins(int pin_storage[]);  
void promptnewpin(void);  
void checkpinlength(int pin);  
void checkpinmatch(int pin);  
void updatepinstorage(int pin);  

int pin = 0;  
int pin_storage[10] = {0};  
int storage_index = 0;  
const int storage_limit = 10;  

//Prompt user for action.  
int main() {  

    int choice = 0;  
    printf("What would you like to do? (V)iew your saved pins, (S)ave a new pin or (E)xit? "); 
    while ((choice = getchar()) != EOF) {  
        getchar(); //clang gives 'unused result' warning but '\n' needs to be removed.  
        if (choice == 'E' || choice == 'e') { break; }  
        else {  
            executechoice(choice);  
            getchar(); //clang gives 'unused result' warning but '\n' needs to be removed.  
            printf("What would you like to do next? (V)iew your saved pins, (S)ave a new pin or (E)xit? ");  
        }  
    }  
    printf("Goodbye!\n");  
    return 0;  
}  

//Function definitions  
void executechoice(int choice) {		
    if (choice == 'V' || choice == 'v') { printsavedpins(pin_storage); }  
    else if (choice == 'S' || choice == 's') { promptnewpin(); }  
    else { printf("Invalid choice! What would you like to do? (V)iew your saved pins, (S)ave a new pin or (E)xit? "); }  
}  

void printsavedpins(int pin_storage[]) {  
    for (int i = 0; i < storage_limit; i++) printf("Pin %d: %d\n", i + 1, pin_storage[i]);  
}  

void promptnewpin(void) {  
    
    printf("Enter new pin: ");  
    scanf("%d", &pin);  
    checkpinlength(pin);  
}  

void checkpinlength(int pin) {  
    
    if (pin < 1000*100) {  
        printf("Pin has to be at least six digits!\n");  
        promptnewpin();  
    }  
    else checkpinmatch(pin);  
}  

void checkpinmatch(int pin) {  

    int check = 0;  
    printf("Verify your new pin: ");  
    scanf("%d", &check);  
    if (check != pin) {  
        printf("Mismatch! ");  
        promptnewpin();  
    }  
    else updatepinstorage(pin);  
}  

void updatepinstorage(int pin) {  

    pin_storage[storage_index] = pin;  
    storage_index++;  
    if (storage_index >= storage_limit) { storage_index = 0; }  
    printf("New pin saved successfully!\n");  
}