// Banker's Algorithm
#include <stdio.h>
int main()
{
	// P0, P1, P2, P3, P4 are the Process names here

	int n, m, i, j, k;
	n = 5; // Number of processes
	m = 3; // Number of resources
	int alloc[5][3] = { { 0, 1, 0 }, // P0 // Allocation Matrix
						{ 2, 0, 0 }, // P1
						{ 3, 0, 2 }, // P2
						{ 2, 1, 1 }, // P3
						{ 0, 0, 2 } }; // P4

	int max[5][3] = { { 7, 5, 3 }, // P0 // MAX Matrix
					{ 3, 2, 2 }, // P1
					{ 9, 0, 2 }, // P2
					{ 2, 2, 2 }, // P3
					{ 4, 3, 3 } }; // P4

	int avail[3] = { 3, 3, 2 }; // Available Resources

	int f[n], ans[n], ind = 0;
	for (k = 0; k < n; k++) {
		f[k] = 0;
	}
	int need[n][m];
	for (i = 0; i < n; i++) {
		for (j = 0; j < m; j++)
			need[i][j] = max[i][j] - alloc[i][j];
	}
	int y = 0;
	for (k = 0; k < 5; k++) {
		for (i = 0; i < n; i++) {
			if (f[i] == 0) {

				int flag = 0;
				for (j = 0; j < m; j++) {
					if (need[i][j] > avail[j]){
						flag = 1;
						break;
					}
				}

				if (flag == 0) {
					ans[ind++] = i;
					for (y = 0; y < m; y++)
						avail[y] += alloc[i][y];
					f[i] = 1;
				}
			}
		}
	}

	int flag = 1;
	
	for(int i=0;i<n;i++)
	{
	if(f[i]==0)
	{
		flag=0;
		printf("The following system is not safe");
		break;
	}
	}
	
	if(flag==1)
	{
	printf("Following is the SAFE Sequence\n");
	for (i = 0; i < n - 1; i++)
		printf(" P%d ->", ans[i]);
	printf(" P%d", ans[n - 1]);
	}
	

	return (0);

	// This code is contributed by Deep Baldha (CandyZack)
}

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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
}