/*
 * C Program to Display the ATM Transaction
 */
#include <stdio.h>
 
unsigned long amount=1000, deposit, withdraw;
int choice, pin, k;
char transaction ='y';
 
void main()
{
	while (pin != 1520)
	{
		printf("ENTER YOUR SECRET PIN NUMBER:");
		scanf("%d", &pin);
		if (pin != 1520)
		printf("PLEASE ENTER VALID PASSWORD\n");
	}
	do
	{
		printf("********Welcome to ATM Service**************\n");
		printf("1. Check Balance\n");
		printf("2. Withdraw Cash\n");
		printf("3. Deposit Cash\n");
		printf("4. Quit\n");
		printf("******************?**************************?*\n\n");
		printf("Enter your choice: ");
		scanf("%d", &choice);
		switch (choice)
		{
		case 1:
			printf("\n YOUR BALANCE IN Rs : %lu ", amount);
			break;
		case 2:
			printf("\n ENTER THE AMOUNT TO WITHDRAW: ");
			scanf("%lu", &withdraw);
			if (withdraw % 100 != 0)
			{
				printf("\n PLEASE ENTER THE AMOUNT IN MULTIPLES OF 100");
			}
			else if (withdraw >(amount - 500))
			{
				printf("\n INSUFFICENT BALANCE");
			}
			else
			{
				amount = amount - withdraw;
				printf("\n\n PLEASE COLLECT CASH");
				printf("\n YOUR CURRENT BALANCE IS%lu", amount);
			}
			break;
		case 3:
			printf("\n ENTER THE AMOUNT TO DEPOSIT");
			scanf("%lu", &deposit);
                        amount = amount + deposit;
			printf("YOUR BALANCE IS %lu", amount);
			break;
		case 4:
			printf("\n THANK U USING ATM");
			break;
		default:
			printf("\n INVALID CHOICE");
		}
		printf("\n\n\n DO U WISH TO HAVE ANOTHER TRANSCATION?(y/n): \n");
		fflush(stdin);
		scanf("%c", &transaction);
		if (transaction == 'n'|| transaction == 'N')
                    k = 1;
	} while (!k);
	printf("\n\n THANKS FOR USING OUT ATM SERVICE");
}

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Read inputs from stdin

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#include <stdio.h>
int main()
{
    char name[50];
    printf("Enter name:");
    scanf("%s", name);
    printf("Hello %s \n" , name );
    return 0;
    
}

About C

C language is one of the most popular general-purpose programming language developed by Dennis Ritchie at Bell laboratories for UNIX operating system. The initial release of C Language was in the year 1972. Most of the desktop operating systems are written in C Language.

Key features:

  • Structured Programming
  • Popular system programming language
  • UNIX, MySQL and Oracle are completely written in C.
  • Supports variety of platforms
  • Efficient and also handle low-level activities.
  • As fast as assembly language and hence used as system development language.

Syntax help

Loops

1. If-Else:

When ever you want to perform a set of operations based on a condition if-else is used.

if(conditional-expression) {
   // code
} else {
   // code
}

You can also use if-else for nested Ifs and if-else-if ladder when multiple conditions are to be performed on a single variable.

2. Switch:

Switch is an alternative to if-else-if ladder.

switch(conditional-expression) {    
case value1:    
 // code    
 break;  // optional  
case value2:    
 // code    
 break;  // optional  
...    
    
default:     
 // code to be executed when all the above cases are not matched;    
}

3. For:

For loop is used to iterate a set of statements based on a condition.

for(Initialization; Condition; Increment/decrement){  
  // code  
}

4. While:

While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.

while(condition) {  
 // code 
}

5. Do-While:

Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.

do {
  // code 
} while (condition);

Arrays

Array is a collection of similar data which is stored in continuous memory addresses. Array values can be fetched using index. Index starts from 0 to size-1.

Syntax

One dimentional Array:

data-type array-name[size];

Two dimensional array:

data-type array-name[size][size];

Functions

Function is a sub-routine which contains set of statements. Usually functions are written when multiple calls are required to same set of statements which increases re-usuability and modularity.

Two types of functions are present in C

  1. Library Functions:

Library functions are the in-built functions which are declared in header files like printf(),scanf(),puts(),gets() etc.,

  1. User defined functions:

User defined functions are the ones which are written by the programmer based on the requirement.

How to declare a Function

return_type function_name(parameters);

How to call a Function

function_name (parameters)

How to define a Function

return_type function_name(parameters) {  
  //code
}