Atm machine program in C

[techking]

Hello everyone I am a student who is in big trouble. I have a ATM machine program that i need to write in C but the problem is that my teacher wants us to use file IO and he didnt teach us how to use it. below is my program. I am desperately begging for help.

#include<stdio.h>
#include<stdlib.h>
int main()
{
   char  option,pin,transaction;
   int deposit, withdraw;
   option='0';
   
   
   
    printf("WELCOME TO SAMUEL'S BANK\n");
	printf("------------------------------\n\n");
	printf("Main Menu\n");
	printf("------------------------------\n");
	printf("1)Enter Pin #\n");
	printf("2)Exit\n");
	printf("------------------------------\n\n");
	scanf("%c", &option);
    




		
		{
            system ("cls");
			printf("Pin Number Verification\n");
			printf("------------------------------\n\n");
			printf("Please enter your pin number: ");
			scanf("%s", &pin);
		
		
		
		

			
			
			//if(inputfile ==NULL)
			{
				printf("Unable to open input file\n");
			}
			return 1;


			system ("cls");	
	    	printf("Transactions\n");
	    	printf("------------------------------\n");
	    	printf("1)Deposit\n2)Withdraw\n3)Statement\n4)Exit\n");
	    	printf("------------------------------\n");
			scanf("%s",&transaction);
		}
			
			
		
			
					if (transaction =='1')
						
						{
						    system ("cls");
							printf("Deposit\n");
							printf("------------------------------\n\n");
							printf("Please enter the amount of money you would like to deposit: ");
							scanf("%d", &deposit);
					}

					if (transaction =='2')
					
						{
							system ("cls");
							printf("Withdraw\n");
							printf("------------------------------\n\n");
							printf("Please enter the amount of money you would like to withdraw: ");
							scanf("%d", &withdraw);
						}

					if (transaction=='3')

						{
							system ("cls");
							printf("Statement\n");
							printf("------------------------------\n\n");
						}



		
			


return 0;


}

[gpraghuram]

But what help u need?
File IO means you want to get the input/ouput from a file instead of STDIO?

Raghu

[techking]

Yes sir but the problem is hat i do not konw how to use file io so i wanted to get help with it.

[techking]

file io

I was not properly thought how to use file io so i wanted help with it becaue we have to use arrays with teh file io too.

[weaknessforcats]

Are you able to get this working using arrays?

Next write a function to load your arrays. Pass in the array addresses and have the function install hard-coded values.

Next, get the program working. You just call the function to load the hard-coded values into the arrays.

After the program is working, replace the guts of the funciton with logic that reads a disc file and stores the data in the arrays.

[techking]

Hey first of all i would like to thank you for responding. I would like to ask you if you had an example of arrays because i wasnt properly thought on how to use it.

[weaknessforcats]

There is an article named Arrays Revealed in the C/C++ HowTos that containes exactly what you want.

Unfortunuately, due to a recent site upgrade the HowTos are not working right now.

I tried to attach it to this post but it is too large.

[weaknessforcats]

Wouldn't you know that five minutes after I said the articel on arrays in unavailable, I found it.

Here it is: http://bytes.com/insights/c/772412-arrays-revealed.

[techking]

Thank you so much. You are a real life saver.