ATM MACHINE PROTOTYPE using C programming language

//hello everyone my name is Manjunath. G. Dharappanavar
//this is a ATM Machine program in c language

#include<stdio.h>
#include<string.h>
#include<ctype.h>

int atm(int amount);
struct account {
    char name[100];
    int password;
    int amount;
};
struct account p1 = {"Rohan", 1234, 2000};
struct account p2 = {"Chetan", 2023, 4500};
struct account p3 = {"Akash", 2204, 3000};

int main() {
    char userName[100];
    int userpass;

    printf("enter name:");
    scanf(" %s", userName);
    // force convert to lower case.
    for(int i = 0; i<strlen(userName); i++) {
        userName[i] = tolower(userName[i]);
        p1.name[i] = tolower(p1.name[i]);
        p2.name[i] = tolower(p2.name[i]);
        p3.name[i] = tolower(p3.name[i]);
    }

    printf("enter password:");
    scanf("%d", &userpass);

    if(strcmp(userName, p1.name)==0) {
        if(userpass == p1.password) {
            printf("welcome %s\n", userName);
            atm(p1.amount);
        }
    }
    else if(strcmp(userName, p2.name)==0) {
        if(userpass == p2.password) {
            printf("welcome %s\n", userName);
            atm(p2.amount);
        }
    }

    else if(strcmp(userName, p3.name)==0) {
        if(userpass == p3.password) {
            printf("welcome %s\n", userName);
            atm(p3.amount);
        }
    }
    else {
        printf("Invalid Input.");
    }

    return 0;
}

//ATM Machine program.

int atm(int amount) {
    int n;
    int withdraw;
    int deposit;
    while(1) {
        printf("enter:\n");
        printf("1: Check Balance.\n");
        printf("2: Withdraw Cash.\n");
        printf("3: Deposit.\n");
        printf("4: To exit.\n");

        printf(":-");
        scanf("%d", &n);


        switch(n) {
        case 1:
            printf("your balance is %d\n ", amount);
            break;

        case 2:
            printf("Withdraw cash.\n");
            printf("enter amount:");
            scanf("%d", &withdraw);
            if(withdraw > amount) {
                printf("withdraw exceeds balance.\n");
                break;
            }
            else {
                amount = amount - withdraw;
                printf("Rs %d deducted. account bal: %d\n ", withdraw, amount);
                break;
            }

        case 3:
            printf("Deposit cash:\n");
            printf("enter amount:");
            scanf("%d", &deposit);
            amount = amount + deposit;

            printf("Rs %d credited. account bal: %d \n", deposit, amount);
            break;

        case 4:
            printf("Thank you for visiting");
            return 0;

        default:
            printf("Invalid Input.\n");


        }
    }
}

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